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6-K 1 ef20022877_6k.htm 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of February, 2024

Commission File Number 001-36487

Atlantica Sustainable Infrastructure plc

(Exact name of Registrant as specified in its charter)

Not applicable

(Translation of Registrant’s name into English)

Great West House, GW1, 17th floor

Great West Road

Brentford, TW8 9DF

United Kingdom

Tel: +44 203 499 0465

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

☒ Form 20-F

☐ Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

March 1, 2024 FY 2023 Earnings Presentation

2 DISCLAIMER Forward Looking Statements This presentation contains forward-looking statements. These forward-looking statements include, but are not limited to, all statements other than statements of historical facts contained in this presentation, including, without limitation, those regarding our future financial position and results of operations, our strategy, plans, objectives, goals and targets, future developments in the markets in which we operate or are seeking to operate. In some cases, you can identify forward- looking statements by terminology such as "anticipate“, “believe”, “could”, “estimate”, “expect“, “may”, “potential”, “should” or “will” or the negative of such terms or other similar expressions or terminology. By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that may or may not occur in the future. Forward-looking statements speak only as of the date of this presentation and are not guarantees of future performance and are based on numerous assumptions. Our actual results of operations, financial condition and the development of events may differ materially from (and be more negative than) those made in, or suggested by, the forward-looking statements. Except as required by law, we do not undertake any obligation to update any forward-looking statements to reflect events or circumstances after the date hereof or to reflect anticipated or unanticipated events or circumstances. Investors should read the section entitled “Item 3.D.—Risk Factors” and the description of our segments and business sectors in the section entitled “Item 4.B. Information on the Company—Business Overview”, each in our Annual Report on Form 20-F for the fiscal year ended December 31, 2023, filed with the Securities and Exchange Commission (“SEC”), for a more complete discussion of the risks and factors that could affect us. Forward-looking statements include, but are not limited to, statements relating to: our financing strategy; our investment plan, including our committed or earmarked investments for 2024; growth update and projects pipeline, our projects under construction or in advance development, including leveraging the framework provided by the Inflation Reduction Act in the U.S.; our plans to sell or acquire certain assets; CAFD estimates, including per currency, geography and sector; net corporate debt / CAFD before corporate debt service based on CAFD estimates; debt refinancing or reduction, including the refinancing risks at the project level; corporate liquidity and debt maturities; our expectations about the demand of renewable energy and our ability to capture growth opportunities; self- amortizing project debt structure; our balance sheet and state of our liquidity; the use of non-GAAP measures as a useful tool for investors; the possibility to extend asset life; efforts relating to environmental, social and governance goals; and various other factors, including those factors discussed under “Item 3.D.—Risk Factors” and “Item 5.A.—Operating Results” in our Annual Report on Form 20-F for the fiscal year ended December 31, 2023 filed with the SEC. The CAFD and other guidance incorporated into this presentation are estimates as of March 1, 2024. These estimates are based on assumptions believed to be reasonable as of the date Atlantica Sustainable Infrastructure plc (“Atlantica”, the “Company”, “we” or “us”) published its 2023 Financial Results. We disclaim any current intention to update such guidance, except as required by law. Non-GAAP Financial Measures This presentation also includes certain non-GAAP financial measures, including Adjusted EBITDA, CAFD, and CAFD per share. Non-GAAP financial measures are not measurements of our performance or liquidity under IFRS as issued by IASB and should not be considered alternatives to operating profit or profit for the period or net cash provided by operating activities or any other performance measures derived in accordance with IFRS as issued by the IASB or any other generally accepted accounting principles or as alternatives to cash flow from operating, investing or financing activities. Please refer to the appendix of this presentation for a reconciliation of the non-GAAP financial measures included in this presentation to the most directly comparable financial measures prepared in accordance with IFRS as well as the reasons why management believes the use of non-GAAP financial measures (including CAFD, CAFD per share, Adjusted EBITDA) in this presentation provides useful information to investors. In our discussion of operating results, we have included foreign exchange impacts in our revenue and Adjusted EBITDA growth. The constant currency presentation is not a measure recognized under IFRS and excludes the impact of fluctuations in foreign currency exchange rates. We believe that constant currency information provides valuable supplemental information regarding our results of operations. We calculate constant currency amounts by converting our current period local currency revenue and Adjusted EBITDA using the prior period foreign currency average exchange rates and comparing these adjusted amounts to our prior period reported results. This calculation may differ from similarly titled measures used by others and, accordingly, the constant currency presentation is not meant to be a substitute for recorded amounts presented in conformity with IFRS as issued by the IASB nor should such amounts be considered in isolation.

3 FY 2023 Earnings Presentation The Year in Review 12% Growth in Renewable Generation Pipeline $ > 340 Million Project Refinancing3 during the year Including Tierra Linda, La Tolua, Albisu, and Honda 1. Our partner in Monterrey initiated a process to sell its 70% stake in the asset. Such process is well advanced and, as part of it, we intend to sell our interest as well under the same terms. The net proceeds to Atlantica are expected to be in the range of $45 to $52 million, after tax. The transaction is subject to certain conditions precedent and final transaction closing. We cannot guarantee that the transaction will finally close. Including €198.0 million from the Project Debt at Solaben 2/3 and €111.0 million from the Project Debt at Logrosan, the holding company for Solaben 1/6 and Solaben 2/3. Considering an average FX Euro/Dollar for 2023 of 1.0816. New Assets Reaching COD1 4 assets from our development pipeline reached COD during 2023 3 Projects Underway Leveraging IRA In construction or in Advanced Development $175-220 Million In investment committed or earmarked for 2024 Capital Recycling 2 30% participation in Monterrey $ 45-52 Million

4 FY 2023 Earnings Presentation HIGHLIGHTS Operating Results CAFD per share is calculated by dividing CAFD for the period by the weighted average number of shares for the period (see reconciliation on page 29). Excluding the impact of FX and of the unscheduled outage at Kaxu in 2023, net of insurance income related to this event. (Achieved Guidance) US$ in million (except CAFD per share) 2023 Full 2022 year ∆ Reported Revenue 1,099.9 1,102.0 (0.2)% Adjusted EBITDA 794.9 797.1 (0.3)% +1.7% CAFD 235.7 237.9 Adj. EBITDA growth on a comparable (0.9)% basis2 CAFD per share1 2.03 2.07 (2.1)%

5 FY 2023 Earnings Presentation HIGHLIGHTS Performance by Region and Sector North America South America EMEA Renewables Efficient Nat. Gas & Heat Transmission Lines Water Revenue Adjusted EBITDA US$ in million Revenue Adjusted EBITDA By Region By Sector 2023 2022 ∆ 424.9 405.1 4.9% 319.3 310.0 3.0% 2023 2022 ∆ 188.1 166.4 13.0% 146.7 126.5 15.9% 2023 2022 ∆ 486.9 530.5 (8.2)% 328.9 360.6 (8.8)% 2023 2022 ∆ 802.8 821.4 (2.3)% 575.7 588.0 (2.1)% 2023 2022 ∆ 118.4 113.6 4.2% 87.4 84.6 3.4% 2023 2022 ∆ 123.5 113.2 9.0% 96.0 88.0 9.1% 2023 2022 ∆ 55.2 53.8 2.7% 35.8 36.5 (2.0)%

6 FY 2023 Earnings Presentation Includes 49% of Vento II production since its acquisition. Includes curtailment in wind assets for which we receive compensation. Represents total installed capacity in assets owned or consolidated at the end of the period, regardless of our percentage of ownership in each of the assets, except for Vento II, for which we have included our 49% interest. GWh produced includes 30% share of the production from Monterrey. Availability refers to the time during which the asset was available to our client totally or partially divided by contracted or budgeted availability, as applicable. Includes 43 MW corresponding to our 30% share in Monterrey and 55 MWt corresponding to thermal capacity from Calgary District Heating. KEY OPERATIONAL METRICS Operational Performance Renewables 2023 2022 GWh produced1 5,458 5,319 MW in operation2 2,171 2,121 Transmission Lines 2023 2022 Availability4 100.0% 100.0% Miles in operation 1,229 1,229 Efficient Natural Gas & Heat Water 2023 2022 Availability4 99.7% 102.3% Mft3 in operation2 17.5 17.5 2023 2022 GWh produced3 2,549 2,501 Availability4 99.6% 98.9% MW in operation5 398 398

7 FY 2023 Earnings Presentation GROWTH UPDATE $175 - 220 Million1 Invested, Committed or Earmarked for 2024 in our Development and Construction Projects Total $175 – 220M1 (1) Estimation of equity already invested, committed or earmarked for investment in 2024 in projects currently under construction or expected to start construction in 2024, including expansions and repowerings. Coso Batteries 1 & Coso Batteries 2 Overnight PV & Storage US $105 - 115M Other PV & Storage $35 - 60M Expansion of transmission lines $30 - 35M Transmission Other projects in geographies where we are present Others $5 - 10M PV and storage in other geographies

8 FY 2023 Earnings Presentation SOME OF OUR PROJECTS Some of our Projects Under Construction and Advanced Development Stage Overnight Solar 150 MW PV California 15-year busbar PPA with Southern California Edison Phase 2 storage planned for a future expansion ATS and ATN Expansions Transmission Fixed capacity payments with inflation indexation Denominated in US dollars Expected investment $40-43 million Under construction

9 FY 2023 Earnings Presentation GROWTH UPDATE 12% Growth in Renewables Pipeline in 2023 vs 2022 47% 11% 41% 1% PV Wind Storage Others Project Type (GW)1 22% 28% 50% Ready to build 24-25 Advanced development stage Early stage 20% 80% Repowering, expansion of existing assets Greenfield developments Only includes projects estimated to be ready to build before or in 2030 of approximately 3.7 GW, 2.2 GW of renewable energy and 1.5 GW of storage (equivalent to 6.0 GWh). Capacity measured by multiplying the size of each project by Atlantica’s ownership. Potential expansions of transmission lines not included. Percentage change between reported 2023 and 2022 pipeline. Renewable Energy(GW) Storage (GWh) 1.2 4.3 0.4 1.6 0.6 0.1 North America Europe South America Source (GW)1 Project Stage (GW)1 Development Pipeline 2.2 +12% 6.0 +5% 2023 %∆2 2023 %∆2 Total Pipeline by Segment, Type, and Timing

See “Disclaimer – Forward Looking Statements”. See reconciliation of 2024E Guidance on page 31. Adjusted EBITDA guidance includes a positive non-cash adjustment for approximately $45.0 million corresponding to the difference between billings and revenue in assets accounted for as concessional financial assets, primarily related to ACT, a negative non-cash adjustment of up to $2.6 million related to electricity market prices in Spain and a negative non-cash adjustment of approximately $58.1 million related to income from cash grants in the U.S. Our partner in Monterrey initiated a process to sell its 70% stake in the asset. Such process is well advanced and, as part of it, we intend to sell our interest as well under the same terms. The net proceeds to Atlantica are expected to be in the range of $45 to $52 million, after tax. The transaction is subject to certain conditions precedent and final transaction closing. We cannot guarantee that 10 the transaction will finally close. FY 2023 Earnings Presentation 2024E Guidance 800 220 - 850 - 270 Range in $ Millions Adjusted EBITDA2 CAFD 2024 TARGETS 2024E Target Guidance Wider CAFD Range Sale of Monterrey stake3 Kaxu unscheduled outage Market price volatility in Spain (to be compensated in the future according to regulation) Collections at ACT + - - - +

Appendix FY 2023 Results Presentation

12 FY 2023 Earnings Presentation SIZEABLE AND DIVERSIFIED ASSET PORTFOLIO Portfolio Breakdown Based on Estimated CAFD 69% Renewable 14% Eff. Natural Gas & Heat 13% Transmission Lines 4% Water of interest rates in project debt are fixed or hedged3 ~92% % Denominated in USD or hedged1,2 > 13 90 years Weighted Average PPA Life Remaining4 of Revenue non dependent on natural resource5 >50% Based on CAFD estimates for the 2024-2027 period as of March 1, 2024, for the assets as of December 31, 2023, including assets that have reached COD before March 1, 2024. See “Disclaimer – Forward Looking Statements”. Euro denominated cash flows from assets in Europe, net of euro-denominated corporate interest payments and general and administrative expenses, are hedged through currency options on a rolling basis 100% for the next 12 months and 75% for the following 12 months. Based on weighted outstanding debt as of December 31, 2023. Calculated as weighted average years remaining as of December 31, 2023, based on CAFD estimates for the 2024-2027 period, including assets that have reached COD before March 1, 2024. See “Disclaimer – Forward Looking Statements”. Calculated as a % of Revenue from FY 2023. Revenues non-dependent on natural resources includes transmission lines, efficient natural gas and heat, water assets and approximately 76% revenues received by our Spanish assets. 100% contracted or regulated. Regulated revenue in Spain, Chile TL3 and Italy and non-contracted nor regulated in the case of Chile PV1 and Chile PV3. 38% North America 35% Europe 20% South America 7% RoW

13 FY 2023 Earnings Presentation (1) Consolidated cash as of December 31, 2023, decreased by $152.6 million vs December 31, 2022, including FX translation differences of $2.3 million. CASH FLOW Operating Cash Flow US$ in million 2023 2022 Adjusted EBITDA 794.9 XX 797.1 Share in Adjusted EBITDA of unconsolidated affiliates (34.6) (45.8) Net interest and income tax paid (272.7) (277.3) Changes in working capital (95.8) ) 78.8 Non-monetary items and other (3.7) 33.5 NET CASH PROVIDED BY OPERATING ACTIVITIES 388.1 586.3 Acquisitions of subsidiaries and entities under the equity method and investments in assets under development and construction (85.5) (87.3) Investments in operating concessional assets (27.9) (39.1) Distributions from entities under the equity method & other 61.8 68.9 NET CASH USED IN INVESTING ACTIVITIES (51.6) (57.4) NET CASH USED IN FINANCING ACTIVITIES (491.4) (535.0) Net (decrease) in consolidated cash1 (154.9) (6.1)

14 FY 2023 Earnings Presentation Net corporate debt is calculated as long-term corporate debt plus short-term corporate debt minus cash and cash equivalents at Atlantica’s corporate level. Net corporate debt / CAFD before corporate debt service is calculated as net corporate debt divided by 2023 CAFD before corporate debt service. CAFD pre-corporate debt service is calculated as CAFD plus corporate debt interest paid by Atlantica. Net project debt is calculated as long-term project debt plus short-term project debt minus cash and cash equivalents at the consolidated project level. NET DEBT Net Corporate Debt to CAFD pre corporate interest at 3.8x Corporate Dec. 31, 2023 Dec. 31, 2022 1,051.7 956.4 3,904.0 4,012.9 Project Net Project Debt3 3.8x 3.4x Net Corporate Debt1 Net Corporate Debt/ CAFD pre corporate debt service2 US$ in million

15 FY 2023 Earnings Presentation Emissions Reduction Targets Approved Science-Based GHG Emissions Reduction Target ESG Our Efforts on ESG Continue to be Recognized S&P Global Sustainability Yearbook 2024 3rd consecutive year GRESB Infrastructure Public Disclosure A Rating Ranked 1st. Best performer 2nd consecutive year Climate Change “A List” Leadership 3rd consecutive year Climate Change and Water Security(New) “A” List Leadership 4th consecutive year Utility Industry Top Rated ESG Risk Rating

16 FY 2023 Earnings Presentation HISTORICAL FINANCIAL REVIEW Key Financials by Quarter (1/2) “Deposits into/withdrawals from restricted accounts” and “Change in non-restricted cash at project level” are calculated on a constant currency basis to reflect actual cash movements isolated from the impact of variations generated by foreign exchange changes during the period. Prior periods have been recalculated to conform to this presentation. Dividends are paid to shareholders in the quarter after they are declared. (3) Number of shares outstanding on the record date corresponding to each dividend, except the shares issued under the ATM program between the dividend declaration date and the dividend record date, as applicable. Key Financials US$ in thousands 2021 1Q22 2Q22 3Q22 4Q22 2022 1Q23 2Q23 3Q23 4Q23 2023 Revenue 1,211,749 247,452 307,832 303,121 243,624 1,102,029 242,509 312,110 303,964 241,311 1,099,894 Adjusted EBITDA 824,388 173,626 228,678 228,336 166,459 797,100 174,204 229,624 223,454 167,640 794,922 Atlantica’s pro-rata share of Adjusted EBITDA from unconsolidated affiliates (31,057) (14,202) (15,988) (7,387) (8,192) (45,769) (11,796) (7,755) (5,726) (9,370) (34,647) Non-monetary items 55,809 10,413 10,940 10,839 (4,196) 27,996 649 (2,384) 9,973 (11,357) (3,119) Accounting provision for electricity market prices in Spain 77,055 7,141 10,585 10,507 (2,980) 25,253 (1,153) (4,460) 9,503 (7,385) (3,495) Difference between billings and revenue in assets accounted for as concessional financial assets 38,890 18,169 15,050 14,978 13,434 61,630 16,441 16,695 15,099 10,657 58,892 Income from cash grants in the US (58,711) (14,897) (14,695) (14,645) (14,650) (58,888) (14,639) (14,619) (14,629) (14,629) (58,516) Other non-monetary items (1,424) - - - - - - - - - Maintenance Capex (17,722) (2,844) (3,614) (7,283) (4,847) (18,588) (7,630) (12,041) (5,067) (3,191) (27,929) Dividends from unconsolidated affiliates 34,883 31,870 11,921 12,411 11,493 67,695 12,401 3,063 13,416 5,449 34,329 Net interest and income tax paid (342,263) (16,546) (112,705) (32,885) (115,148) (277,284) (30,179) (108,666) (21,059) (112,805) (272,708) Changes in other assets and liabilities 43,696 (5,588) 6,415 52,186 49,885 102,896 (92,980) (8,295) (11,516) 20,055 (92,736) Deposits into/withdrawals from debt service accounts1 2,729 11,805 8,020 (20,503) 33,696 33,018 9,820 11,418 (8,813) 35,192 47,617 Change in non-restricted cash at project companies1 2,209 (103,116) 51,501 (135,718) 125,662 (61,672) 43,114 73,659 (98,297) 107,849 126,325 Dividends paid to non-controlling interests (28,134) (6,221) (9,800) (10,421) (12,767) (39,209) (6,011) (11,180) (8,568) (5,674) (31,433) Principal amortization of indebtedness net of new indebtedness at projects (318,991) (24,789) (112,427) (27,912) (183,183) (348,311) (30,543) (103,918) (28,208) (142,211) (304,880) Cash Available For Distribution (CAFD) 225,547 54,407 62,941 61,662 58,862 237,872 61,049 63,525 59,589 51,577 235,740 Dividends declared2 193,422 50,202 51,332 51,645 51,645 204,824 51,688 51,688 51,691 51,691 206,758 # of shares3 114,095,845 115,352,085 116,055,126 116,055,126 116,153,273 116,153,273 116,159,054 116,159,054 DPS (in $ per share) 1.735 0.44 0.445 0.445 0.445 1.775 0.445 0.445 0.445 0.445 1.780

17 FY 2023 Earnings Presentation US$ in million Debt Details 2021 1Q22 2Q22 3Q22 4Q22 2022 1Q23 2Q23 3Q23 4Q23 2023 Project Debt 5,036.2 5,037.0 4,735.5 4,621.9 4,553.1 4,553.1 4,596.6 4,438.2 4,412.1 4,319.3 4,319.3 Project Cash (534.4) (625.9) (545.1) (675.8) (540.2) (540.2) (493.5) (414.0) (546.6) (415.3) (415.3) Net Project Debt 4,501.8 4,411.1 4,190.4 3,946.1 4,012.9 4,012.9 4,103.1 4,024.2 3,865.5 3,904.0 3,904.0 Corporate Debt 1,023.1 1,056.1 1,000.1 955.5 1,017.2 1,017.2 1,077.4 1,051.2 1,046.6 1,084.8 1,084.8 Corporate Cash (88.3) (113.1) (123.1) (105.8) (60.8) (60.8) (109.4) (72.8) (48.0) (33.1) (33.1) Net Corporate Debt 934.8 943.0 877.0 849.7 956.4 956.4 968.0 978.4 998.6 1,051.7 1,051.7 Total Net Debt 5,436.6 5,354.1 5,067.4 4,795.8 4,969.3 4,969.3 5,071.1 5,002.6 4,864.1 4,955.9 4,955.9 Net Corporate Debt / CAFD pre corporate interests1 3.5x 3.3x 3.1x 3.0x 3.4x 3.4x 3.3x 3.4x 3.4x 3.8x 3.8x HISTORICAL FINANCIAL REVIEW Key Financials by Quarter (2/2) (1) Ratios presented are the ratios shown on each earnings presentation relating to such period.

18 FY 2023 Earnings Presentation HISTORICAL FINANCIAL REVIEW Segment Financials by Quarter 1Q22 2Q22 3Q22 4Q22 2022 74,304 124,968 124,423 81,352 405,047 38,528 39,804 44,217 43,892 166,441 134,620 143,060 134,481 118,380 530,541 182,101 238,234 232,423 168,619 821,377 25,327 28,091 28,526 31,647 113,591 26,620 28,234 28,425 29,994 113,273 13,404 13,273 13,747 13,364 53,788 247,452 307,832 303,121 243,624 1,102,029 1Q23 2Q23 3Q23 4Q23 2023 72,840 129,331 136,574 86,143 424,888 43,720 47,793 48,756 47,858 188,127 125,949 134,986 118,634 107,310 486,879 172,600 238,610 228,907 162,639 802,756 27,403 27,407 30,164 33,443 118,417 28,831 32,167 30,827 31,651 123,476 13,674 13,927 14,066 13,579 55,245 242,509 312,110 303,964 241,311 1,099,894 2021 395,775 154,985 660,989 928,525 123,692 105,680 53,852 1,211,749 1Q22 2Q22 3Q22 4Q22 2022 58,266 102,913 96,981 51,828 309,988 29,129 29,715 36,236 31,471 126,551 86,231 96,051 95,118 83,161 360,561 122,223 174,606 173,022 118,165 588,016 21,699 22,315 22,794 17,752 84,560 20,523 22,656 23,047 21,784 88,010 9,181 9,102 9,473 8,758 36,514 173,626 228,678 228,336 166,459 797,100 1Q23 2Q23 3Q23 4Q23 2023 51,969 102,069 106,646 58,580 319,264 33,788 40,640 37,621 34,673 146,722 88,447 86,915 79,186 74,388 328,936 119,122 173,448 167,872 115,262 575,704 22,610 21,396 22,520 20,867 87,393 23,470 25,780 24,006 22,787 96,043 9,002 9,000 9,055 8,725 35,782 174,204 229,624 223,453 167,641 794,922 2021 311,803 119,547 393,038 602,583 99,935 83,635 38,235 824,388 Revenue US $ in thousands by Geography NORTH AMERICA SOUTH AMERICA EMEA by Business Sector RENEWABLES EFFICIENT NAT. GAS & HEAT TRANSMISSION LINES WATER Total Revenue Adjusted EBITDA by Geography NORTH AMERICA SOUTH AMERICA EMEA by Business Sector RENEWABLES EFFICIENT NAT. GAS & HEAT TRANSMISSION LINES WATER Total Adjusted EBITDA

Represents total installed capacity in assets owned or consolidated at the end of the period, regardless of our percentage of ownership in each of the assets, except for Vento II, for which we have included our 49% interest. Includes 43 MW corresponding to our 30% share in Monterrey and 55 MWt corresponding to thermal capacity from Calgary District Heating since May 14, 2021. Includes 49% of Vento II production since its acquisition. Includes curtailment in wind assets for which we receive compensation. GWh produced includes 30% share of the production from Monterrey. Availability refers to the time during which the asset was available to our client totally or partially divided by contracted or budgeted availability, as applicable. 19 FY 2023 Earnings Presentation Production / Availability 2021 1Q22 2Q22 3Q22 4Q22 2022 1Q23 2Q23 3Q23 4Q23 2023 RENEWABLES3 (GWh) 4,655 1,094 1,554 1,507 1,164 5,319 1,192 1,611 1,580 1,075 5,458 EFFICIENT NAT. (GWh)4 2,292 625 626 647 603 2,501 600 630 662 657 2,549 GAS & HEAT (availability %)5 100.6% 100.3% 99.9% 101.1% 95.1% 98.9% 94.9% 99.2% 102.3% 102.1% 99.6% TRANSMISSION LINES (availability %)5 100.0% 99.9% 99.9% 100.0% 100.0% 100.0% 100.0% 100.0% 99.9% 99.9% 100.0% WATER (availability %)5 97.9% 104.5% 99.9% 103.3% 101.4% 102.3% 100.8% 100.1% 102.5% 95.2% 99.7% Capacity in operation (at the end of the period) 2021 1Q22 2Q22 3Q22 4Q22 2022 1Q23 2Q23 3Q23 4Q23 2023 RENEWABLES1 (MW) 2,044 2,044 2,048 2,121 2,121 2,121 2,161 2,161 2,161 2,171 2,171 EFFICIENT NAT. GAS & HEAT2 (MW) 398 398 398 398 398 398 398 398 398 398 398 TRANSMISSION LINES (Miles) 1,166 1,229 1,229 1,229 1,229 1,229 1,229 1,229 1,229 1,229 1,229 WATER1 (Mft3/day) 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 HISTORICAL FINANCIAL REVIEW Key Performance Indicators

20 FY 2023 Earnings Presentation Historical Capacity Factors1 2021 1Q22 2Q22 3Q22 4Q22 2022 1Q23 2Q23 3Q23 4Q23 2023 SOLAR US 26.1% 17.2% 39.1% 32.4% 16.6% 26.3% 15.2% 42.4% 36.9% 18.5% 28.3% Chile2 23.9% 25.3% 20.4% 24.6% 28.8% 24.8% 27.6% 21.4% 19.0%5 18.5%5 21.6% Spain 18.6% 7.3% 23.6% 27.9% 5.8% 16.2% 11.7% 26.9% 30.1% 7.2% 19.0% Italy 16.5% 12.7% 19.7% 20.0% 9.2% 15.4% 11.8% 16.9% 18.3% 8.3% 13.8% Kaxu 33.6% 36.9% 27.2% 28.8% 44.6% 34.4% 45.2% 21.2% 4.9%4 0.0%4 17.7%4 Colombia WIND - 27.1% 24.0% 24.7% 23.4% 24.8% 20.6% 22.8% 27.3% 24.0%6 21.7%6 US 28.3% 38.1% 35.6% 20.3% 34.8% 32.2% 37.7% 26.4% 20.2% 31.9% 29.0% Uruguay3 36.9% 34.5% 27.7% 38.2% 41.8% 35.6% 33.6% 29.4% 42.3% 46.3% 37.9% Capacity factor ratio represents actual electrical energy output over a given period of time divided by the maximum possible electrical energy output assuming continuous operation at full nameplate capacity over that period. Historical Capacity Factors are calculated from the date of entry into operation or the acquisition of each asset. Some capacity factors are not indicative of a full period of operations. Includes Chile PV 2 since Q1 2021 and Chile PV 3 since Q3 2022. Includes curtailment production in wind assets for which we receive compensation. Scheduled major overhaul carried out by Siemens, the original equipment manufacturer, which lasted 28 days longer than expected and a subsequent unscheduled outage. Reduction in net capacity factor in Chile Solar in Q3 and Q4 2023 mostly due to curtailments, Additionally, lower solar resource in Q4 2023. Does not include 10MW from Honda 1 because asset had COD by the end of December 2023 and did not contribute to production during quarter. HISTORICAL FINANCIAL REVIEW Capacity Factors

21 FY 2023 Earnings Presentation Exchange rates as of December 31, 2023 (EUR/USD = 1.1039) and December 31, 2022 (EUR/USD = 1.0705). Restricted cash is cash which is restricted generally due to requirements of certain project finance agreements. US $ in million1 As of Dec. 31 2023 As of Dec. 31 2022 Corporate cash at Atlantica 33.0 60.8 Existing available revolver capacity 378.1 385.1 Total Corporate Liquidity 411.1 445.9 Cash at project companies 415.3 540.2 - Restricted2 177.0 207.6 - Other 238.3 332.6 LIQUIDITY Liquidity Position

22 FY 2023 Earnings Presentation Strong Liquidity and No Significant Corporate Debt Maturities in the Short-term 411.1 33.0 34.0 179.1 321.0 154.0 396.8 0 100 200 300 400 500 2024 2025 2026 2027 2028 ~$411.1 million Corporate Liquidity ~3.6 years average maturity2 of current corporate debt Revolving Credit Facility’s total limit is $450.0 million, of which $378.1 million was available as of December 31, 2023 $411.1 million available liquidity, out of which $33.0 million was corporate cash as of December 31, 2023 Corporate Debt Maturities1,2 Corporate Debt is the indebtedness where Atlantica Sustainable Infrastructure plc. is the primary obligor. Corporate Debt Maturities as of December 31 2023, except for the Revolving Credit Facility for which we are considering the new maturity of December 2025, extended on May 30, 2023. Corporate Liquidity means cash and cash equivalents held at Atlantica Sustainable Infrastructure plc. level as of December 31, 2023 plus available capacity under the Revolving Credit Facility as of December 31, 2023. Corporate Cash corresponds to cash and cash equivalents held at Atlantica Sustainable Infrastructure plc. Corporate Liquidity 3 Corp. Cash @ 31/12/23 4 LIQUIDITY AND DEBT MATURITIES Liquidity and Corporate Debt Maturities

23 FY 2023 Earnings Presentation Year 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Chile TL 4 45 46 47 48 49 72 Chile TL 3 Monterrey ATS Solana Coso Tenes Mojave Solaben 1&6 Albisu Solaben 2&3 Solacor 1&2 Helios 1&2 Palmucho Honaine Helioenergy 1&2 Seville PV Calgary La Sierpe Melowind Solnova 1&3&4 Kaxu Quadra 1&2 Palmatir Cadonal Skikda PS 20 La Tolua Tierra Linda ATN 2 ACT PS 10 Mini-Hydro Italy PV 1&2&3&4 Honda 1 Elkhorn Valley Prairie Star Twin Groves II # OF YEARS 34 37 35 37 37 37 37 35 34 34 33 36 32 39 27 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 48 27 35 32 49 7 46 38 38 33 33 34 34 33 41 43 35 35 36 30 31 40 41 44 ATN4 Does not include assets without PPAs or partially contracted. Calculated as weighted average years remaining as of December 31, 2023 based on CAFD estimates for the 2024-2027 period, including assets that have reached COD before December 31, 2023. See “Disclaimer – Forward Looking Statements”. Regulation term in the case of Spain and Chile TL3. From the total amount of $211 million project debt, $74 million are progressively repaid following a theoretical 2036 maturity, with a legal maturity in 2027. The remaining $137 million are expected to be refinanced in or before 2027. LONG-TERM STABLE CASH FLOW Portfolio of Contracted Assets1 Refinancing opportunities could increase CAFD in earlier years Tails in most assets after debt amortization PPAs with predefined prices for ~13 years on average2 Possibility to extend life in many assets (excluding ATN and ATS) Weighted Average Life Project debt term Contract term3

24 FY 2023 Earnings Presentation CORPORATE DEBT DETAILS Corporate Debt as of December 31, 2023 Exchange rates as of December 31, 2023 (EUR/USD = 1.1039). Amounts include principal amounts outstanding, unless stated otherwise. As of December 31, 2023, letters of credit with face value in an amount equal to $54.4 million were outstanding and $378.1 million were available under the Revolving Credit Facility. The latter has a total limit of $450 million. US $ in million1 Maturity Amounts2 Credit Facilities (Revolving Credit Facility)3 2025 54.4 (Other facilities)4 2024 – 2028 53.3 Green Exchangeable Notes5 2025 110.0 2020 Green Private Placement6 (€ denominated) 2026 318.7 Note Issuance Facility 20207 (€ denominated) 2027 152.4 Green Senior Notes8 2028 396.0 Total 1,084.8 Other facilities include the Commercial Paper Program, accrued interest payable and other debt. Senior unsecured notes dated July 17, 2020, upon exchange, the notes may be settled, at our election, into Atlantica ordinary shares, cash or a combination of both. Senior secured notes dated April 1, 2020, of €290 million. Senior unsecured note facility dated July 8, 2020, of €140 million. Green Senior Unsecured Notes dated May 18, 2021, of $400 million.

25 FY 2023 Earnings Presentation fixed or hedged1 Calculated as the weighted average of the % of fixed or hedged corporate debt and the % of fixed or hedged project debt based on outstanding balance as of December 31, 2023. See our Annual Report on Form 20-F for the fiscal year ended December 31, 2023 for additional information on the specific interest rates and hedges. Percentage fixed or hedged. Weighted average based on outstanding balance as of December 31, 2023. Other facilities include the Commercial Paper Program, accrued interest payable and other debt. Hedged at 100% until the end of 2024. INSTRUMENT INTEREST TYPE DEC. 31, 2023 Revolving Credit Facility (RCF) Variable 54.4 Green Exchangeable Notes Fixed 110.0 2020 Green Private Placement Fixed 318.7 Note Issuance Facility 2020 Hedged (100%)6 152.4 Green Senior Notes Fixed 396.0 Other facilities5 Fixed 52.3 Total Outstanding Debt 1,084.8 Hedged4 14.1% Fixed4 80.0% Total Fixed or Hedged 94.1% of Corporate Debt ~94% of Project Debt & ~92% INTEREST RATE RISK COVERAGE 93%1 of Consolidated Debt Fixed or Hedged2 Project Debt Corporate Debt ASSET INTEREST TYPE FIXED1,3 Solana fixed 100% Mojave fixed 100% Coso hedged 100% Solaben 2 hedged 90% Solaben 3 hedged 90% Logrosan hedged 100% Solacor 1 hedged 90% Solacor 2 hedged 90% Helioenergy 1 hedged 99% Helioenergy 2 hedged 99% Solnova 1 hedged 90% Solnova 3 hedged 90% Solnova 4 hedged 90% Helios 1/2 fixed 100% 100% Solaben 1/6 fixed Palmatir fixed 94% Cadonal hedged 88% Melowind hedged 75% ACT hedged 75% ATN fixed 100% ATN 2 fixed 100% ATS fixed 100% 75% Quadra 1 hedged Quadra 2 hedged 75% 75% Palmucho hedged Skikda fixed 100% 100% Tenes fixed Kaxu hedged 58% 80% 78% Chile PV 1&2 hedged Rioglass hedged Montesejo fixed 100% Hedged4 Fixed4 42.6% 59.7% Total Fixed or Hedged 92.3%

26 FY 2023 Earnings Presentation Project Debt Amortization Schedule Full Year Asset ($ Millions) 2024 2025 2026 2027 2028 Thereafter Total Solana 25.4 26.8 29.5 32.4 35.4 418.6 568.1 Mojave 37.6 38.1 39.4 40.7 36.2 279.2 471.2 Kaxu 26.3 26.0 29.3 31.9 34.7 85.8 234 Helios 1/2 22.2 22.4 21.8 22.2 22.5 168.6 279.7 Solaben 1/6 14.3 15.2 15.9 16.3 17.0 101.0 179.7 Solaben 2/3 13.2 19.4 21.5 23.1 115.94 128.1 321.2 Solnova 1/3/4 31.5 31.5 33.1 32.9 31.7 177.4 338.1 Helioenergy 1/2 19.3 20.5 19.4 20.7 23.0 132.3 235.2 Solacor 1/2 14.7 15.1 15.5 15.9 16.1 132.3 209.6 Chile PV 1 2.6 1.0 1.1 1.6 2.2 41.7 50.2 Chile PV 2 1.3 1.4 2.4 2.0 2.2 11.5 20.8 Italy PV 1, 3 & 4 0.6 0.6 0.3 - - - 1.5 Total Solar 209.0 218.0 229.2 239.7 336.9 1,676.5 2,909.3 Palmatir 7.0 6.6 7.0 7.5 8.0 30.2 66.3 Cadonal 3.5 3.1 3.4 3.6 3.9 26.8 44.3 Melowind 4.8 5.0 5.1 4.8 5.7 40.8 66.2 Total Wind 15.3 14.7 15.5 15.9 17.6 97.8 176.8 ATN 6.1 6.4 6.9 7.3 6.7 48.2 81.6 ATS 12.0 8.3 9.5 10.7 12.1 332.0 384.6 ATN 2 5.0 5.1 5.4 5.4 5.6 14.2 40.7 Quadra 1/2 & Palmucho 5.5 6.1 6.6 7.3 8.0 20.7 54.2 Total Transmission 28.6 25.9 28.4 30.7 32.4 415.1 561.1 Skikda 2.6 - - - - - 2.6 Tenes 8.6 8.6 8.9 9.3 9.6 28.7 73.7 Total Water 11.2 8.6 8.9 9.3 9.6 28.7 76.3 Coso 14.6 14.2 14.7 145.15 - - 188.6 ACT 39.2 42.3 54.6 59.0 68.0 138.4 401.5 Rioglass CSP 2.4 1.6 1.2 0.3 0.1 - 5.6 Total Other 56.2 58.1 70.5 204.4 68.1 138.4 595.7 Total Non-Recourse Project Debt 320.3 325.3 352.5 500.0 464.6 2,356.5 4,319.3 No refinancing risk at the project level3 Includes $87.2 million tranche mini-perm structure to be refinanced in 2028. Includes $140 million tranche mini-perm structure to be refinanced in 2027. Project debt amortization schedule as of December 31, 2023. Not including unconsolidated affiliates. (3) Only 5% of our project debt needs to be refinanced by 2027/2028, which corresponds to the two tranches in (4) and (5).

Our management believes Adjusted EBITDA, CAFD, and CAFD per share are useful to investors and other users of our financial statements in evaluating our operating performance because such measures provide investors with additional tools to compare business performance across companies and across periods. Adjusted EBITDA is widely used by investors to measure a company’s operating performance without regard to items such as interest expense, taxes, depreciation and amortization, which can vary substantially from company to company depending upon accounting methods and book value of assets, capital structure and the method by which assets were acquired. Our management believes CAFD and CAFD per share are relevant supplemental measure of the Company’s ability to earn and distribute cash returns to investors and is useful to investors in evaluating our operating performance because securities analysts and other interested parties use such calculations as a measure of our ability to make quarterly distributions. In addition, CAFD and CAFD per share are used by our management team for determining future acquisitions and managing our growth. Our management uses Adjusted EBITDA, CAFD and CAFD per share as measures of operating performance to assist in comparing performance from period to period and aims to use them on a consistent basis moving forward. They also readily view operating trends as a measure for planning and forecasting overall expectations, for evaluating actual results against such expectations, and for communicating with our board of directors, shareholders, creditors, analysts and investors concerning our financial performance. Adjusted EBITDA, CAFD, and CAFD per share are widely used by other companies in the same industry. We present non-GAAP financial measures because we believe that they and other similar measures are widely used by certain investors, securities analysts and other interested parties as supplemental measures of performance and liquidity. The non-GAAP financial measures may not be comparable to other similarly titled measures employed by other companies and they may have limitations as analytical tools. These measures may not be fit for isolated consideration or as a substitute for analysis of our operating results as reported under IFRS as issued by the IASB. Non-GAAP financial measures and ratios are not measurements of our performance or liquidity under IFRS as issued by the IASB. Thus, they should not be considered as alternatives to operating profit, profit for the period, any other performance measures derived in accordance with IFRS as issued by the IASB, any other generally accepted accounting principles or as alternatives to cash flow from operating, investing or financing activities. Some of the limitations of these non-GAAP measures are: they do not reflect our cash expenditures, future requirements for capital expenditures or contractual commitments; they do not reflect changes in, or cash requirements for, our working capital needs; they may not reflect the significant interest expense, or the cash requirements necessary, to service interest or principal payments, on our debts; although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often need to be replaced in the future and Adjusted EBITDA, CAFD and, CAFD per share do not reflect any cash requirements that would be required for such replacements; some of the exceptional items that we eliminate in calculating Adjusted EBITDA reflect cash payments that were made, or will be made in the future; and the fact that other companies in our industry may calculate Adjusted EBITDA, CAFD, and CAFD differently than we do, which limits their usefulness as comparative measures. We define Adjusted EBITDA as profit/(loss) for the period attributable to the parent company, after previously adding back loss/(profit) attributable to non- controlling interest, income tax expense, financial expense (net), depreciation, amortization and impairment charges of entities included in our consolidated financial statements and depreciation and amortization, financial expense and income tax expense of unconsolidated affiliates (pro-rata of our equity ownership). CAFD is calculated as cash distributions received by the Company from its subsidiaries minus cash expenses of the Company, including debt service and general and administrative expenses, plus realized dispositions gains and losses of ownership interest in assets. CAFD per share is calculated by dividing CAFD for the period by weighted average number of shares for the period. 27 FY 2023 Earnings Presentation NON-GAAP FINANCIAL INFORMATION Reconciliation of Non-GAAP Measures

28 FY 2023 Earnings Presentation Information presented as the pro-rata share of our unconsolidated affiliates reflects our proportionate ownership of each asset in our property portfolio that we do not consolidate and has been calculated by multiplying our unconsolidated affiliates’ financial statement line items by our percentage ownership thereto. Note 7 to our consolidated financial statements as of and for the period ended December 31, 2023 includes a description of our unconsolidated affiliates and our pro rata share thereof. We do not control the unconsolidated affiliates. Multiplying our unconsolidated affiliates’ financial statement line items by our percentage ownership may not accurately represent the legal and economic implications of holding a noncontrolling interest in an unconsolidated affiliate. We include pro-rata share of depreciation and amortization, financial expense and income tax expense of unconsolidated affiliates because we believe it assists investors in estimating the effect of such items in the profit/(loss) of entities carried under the equity method (which is included in the calculation of our Adjusted EBITDA) based on our economic interest in such unconsolidated affiliates. Each unconsolidated affiliate may report a specific line item in its financial statements in a different manner. In addition, other companies in our industry may calculate their proportionate interest in unconsolidated affiliates differently than we do, limiting the usefulness of such information as a comparative measure. Because of these limitations, the information presented as the pro-rata share of our unconsolidated affiliates should not be considered in isolation or as a substitute for our or such unconsolidated affiliates’ financial statements as reported under applicable accounting principles. NON-GAAP FINANCIAL INFORMATION Reconciliation of Non-GAAP Measures

29 FY 2023 Earnings Presentation (1) “Deposits into/ withdrawals from restricted accounts” and “Change in non-restricted cash at project level” are calculated on a constant currency basis to reflect actual cash movements isolated from the impact of variations generated by foreign exchange changes during the period. (in thousands of U.S. dollars) For the three-month period ended December 31 For the year ended December 31 2023 2022 2023 2022 Profit/(loss) for the period attributable to the Company (2,251) 4,030 43,380 (5,443) Profit/(loss) attributable to non-controlling interest (9,789) (7,922) (6,932) 3,356 Income tax (11,164) (22,664) 790 (9,689) Depreciation and amortization, financial expense and income tax expense of unconsolidated affiliates (pro rata of our equity ownership) 3,026 7,395 21,439 24,304 Financial expense, net 80,050 86,041 317,974 310,934 Depreciation, amortization, and impairment charges 107,769 99,579 418,271 473,638 Adjusted EBITDA 167,641 166,459 794,922 797,100 Atlantica’s pro-rata share of EBITDA from unconsolidated affiliates (8,708) (8,192) (34,647) (45,769) Non-monetary items (11,357) (4,196) (3,119) 27,996 Accounting provision for electricity market prices in Spain (7,385) (2,980) (3,495) 25,253 Difference between billings and revenue in assets accounted for as concessional financial assets 10,615 13,434 58,892 61,631 Income from cash grants in the US (14,629) (14,650) (58,516) (58,888) Other non monetary items - - - - Maintenance Capex (3,191) (4,847) (27,929) (18,588) Dividends from equity method investments 5,449 11,493 34,329 67,695 Net interest and income tax paid (112,805) (115,148) (272,708) (277,284) Changes in other assets and liabilities 20,054 49,885 (92,736) 102,896 Deposits into/ withdrawals from restricted accounts1 35,192 33,696 47,617 33,018 Change in non-restricted cash at project level1 107,848 125,662 126,324 (61,672) Dividends paid to non-controlling interests (5,674) (12,767) (31,433) (39,209) Debt principal repayments (142,211) (183,183) (304,880) (348,311) Cash Available For Distribution 51,576 58,862 235,740 237,872 RECONCILIATION Reconciliation of CAFD and Adjusted EBITDA to Profit for the period attributable to the Company

30 FY 2023 Earnings Presentation RECONCILIATION Reconciliation of Adjusted EBITDA to Net Cash Provided by Operating Activities (in thousands of U.S. dollars) For the three-month period ended December 31 For the year ended December 31 2023 2022 2023 2022 Net cash provided by operating activities 54,226 70,595 388,048 586,322 Net interest and income tax paid 112,805 115,149 272,708 277,284 Changes in working capital (20,303) (31,027) 95,844 (78,805) Non-monetary items & other 11,542 3,550 3,674 (33,470) Atlantica’s pro-rata share of EBITDA from unconsolidated affiliates 9,371 8,192 34,648 45,769 Adjusted EBITDA 167,641 166,459 794,922 797,100 Reconciliation of CAFD to CAFD per share For the three-month period ended December 31 For the year ended December 31 2023 2022 2023 2022 CAFD (in thousands of U.S. dollars) 51,576 58,862 235,739 237,872 Weighted average number of shares (basic) for the period (in thousands) 116,159 116,055 116,152 114,695 CAFD per share (in U.S. dollars) 0.4440 0.5072 2.0296 2.0740

31 FY 2023 Earnings Presentation RECONCILIATION Reconciliation of 2024 Target Guidance for Adjusted EBITDA to CAFD (in millions of U.S. dollars) Guidance1 2024E Adjusted EBITDA 800 - 850 Atlantica’s pro-rata share of EBITDA from unconsolidated affiliates (40) - (50) Dividends from equity method investments 40 – 50 Non-monetary items2 (15) - (60) Net interest and income tax paid (290) - (310) Maintenance Capex (20) - (30) Dividends paid to non controlling interests (25) - (35) Principal amortization of indebtedness (290) - (310) Changes in other assets and liabilities and change in available cash at project level 50 – 90 Monterrey divestment excluding gain 30 - 30 Cash Available For Distribution 220 - 270 The forward-looking measures of 2024 Adjusted EBITDA and CAFD are non-GAAP measures that cannot be reconciled to the most directly comparable GAAP financial measure without unreasonable effort primarily because of the uncertainties involved in estimating forward looking income tax expense, mark-to-market changes in derivatives, profit attributable to non-controlling interest and Share of loss/(profit) of entities carried under the equity method to arrive at net income and which are subtracted therefrom to arrive to CAFD. Non-monetary items include (1) a positive non-cash adjustment for approximately $45 million corresponding to the difference between billings and revenue in assets accounted for as concessional financial assets, primarily related to ACT, (2) a negative non-cash adjustment between $45 million and nil related to electricity market prices in Spain and (3) a negative non-cash adjustment of approximately $58 million related to income from cash grants in the U.S.

32 FY 2023 Earnings Presentation ASSET TYPE STAKE LOCATION GROSS CAPACITY OFFTAKER RATING1 YEARS IN CONTRACT LEFT6 CURRENCY As of December 31, 2023 RENEWABLE ENERGY Solana 100% USA (Arizona) 280 MW APS BBB+/A3/BBB+ 20 USD Mojave 100% USA (California) 280 MW PG&E BB/Ba1/BB+ 16 USD Coso 100% USA (California) 135 MW SCPPA & two CCAs4 Investment grade4 18 USD Elkhorn Valley7 49% USA (Oregon) 101 MW Idaho Power Company BBB/Baa1/-- 4 USD Prairie Star7 49% USA (Minnesota) 101 MW Great River Energy --/A3/A- 4 USD Twin Groves II7 49% USA (Illinois) 198 MW Exelon Generation Co. BBB+/Baa2/-- 2 USD Lone Star II7 49% USA (Texas) 196 MW n/a n/a n/a USD Chile PV 1 35% Chile 55 MW n/a n/a n/a USD3 Chile PV 2 35% Chile 40 MW n/a Not rated 7 USD3 Chile PV 3 35% Chile 73 MW n/a n/a n/a USD3 La Sierpe 100% Colombia 20 MW Coenersa5 Not rated 12 COP La Tolua 100% Colombia 20 MW Coenersa5 Not rated 9 COP Honda 1 50% Colombia 10 MW Enel Colombia BBB-/---/BBB 7 COP Albisu 100% Uruguay 10 MW Montevideo Refrescos Not rated 15 UYU Palmatir 100% Uruguay 50 MW UTE BBB+/Baa2/BBB2 10 USD Cadonal 100% Uruguay 50 MW UTE BBB+/Baa2/BBB2 11 USD Melowind 100% Uruguay 50 MW UTE BBB+/Baa2/BBB2 12 USD Mini-Hydro 100% Peru 4 MW Peru BBB/Baa1/BBB 9 USD3 Tierra Linda 100% Colombia 10 MW Coenersa5 Not rated 9 COP Reflects the counterparties’ issuer credit ratings issued by S&P, Moody’s and Fitch, respectively, as of February 29, 2024. It refers to the credit rating of Uruguay, as UTE is unrated. USD denominated but payable in local currency. Refers to the credit rating of two Community Choice Aggregators: Silicon Valley Clean Energy and Monterrey Bay Community Power, both with A rating from S&P; Southern California Public Power Authority, the third off-taker, is not rated. AT A GLANCE Sizeable and Diversified Asset Portfolio Largest electricity wholesaler in Colombia. As of December 31, 2023. Part of Vento II portfolio.

33 FY 2023 Earnings Presentation As of December 31, 2023 ASSET TYPE STAKE LOCATION OFFTAKER RATING1 YEARS IN CONTRACT LEFT6 CURRENCY RENEWABLE ENERGY Solaben 2/3 70% Spain GROSS CAPACITY 2x50 MW Kingdom of Spain A/Baa1/A- 14/14 EUR4 Solacor 1/2 87% Spain 2x50 MW Kingdom of Spain A/Baa1/A- 13/13 EUR4 PS 10/20 100% Spain 31 MW Kingdom of Spain A/Baa1/A- 8/10 EUR4 Helioenergy 1/2 100% Spain 2x50 MW Kingdom of Spain A/Baa1/A- 13/13 EUR4 Helios 1/2 100% Spain 2x50 MW Kingdom of Spain A/Baa1/A- 13/14 EUR4 Solnova 1/3/4 100% Spain 3x50 MW Kingdom of Spain A/Baa1/A- 11/11/12 EUR4 Solaben 1/6 100% Spain 2x50 MW Kingdom of Spain A/Baa1/A- 15/15 EUR4 Seville PV 80% Spain 1 MW Kingdom of Spain A/Baa1/A- 12 EUR4 Italy PV 1 100% Italy 1.6 MW Italy BBB/Baa3/BBB 8 EUR4 Italy PV 2 100% Italy 2.1 MW Italy BBB/Baa3/BBB 8 EUR4 Italy PV 3 100% Italy 2.5 MW Italy BBB/Baa3/BBB 8 EUR4 Italy PV 4 100% Italy 3.6 MW Italy BBB/Baa3/BBB 8 EUR4 Kaxu 51% South Africa 100 MW Eskom BB-/Ba2/BB-2 11 ZAR EFFICIENT NAT. GAS & HEAT TRANSMISSION LINES WATER Calgary 100% Canada 55 MWt 22 High quality clients3 ~60% AA- or higher3 12 CAD ACT 100% Mexico 300 MW Pemex BBB/B3/B+ 9 USD5 Monterrey 30% Mexico 142 MW Industrial Customers Not rated 22 USD ATN 100% Peru 379 miles Peru BBB/Baa1/BBB 17 USD5 ATS 100% Peru 569 miles Peru BBB/Baa1/BBB 20 USD5 ATN 2 100% Peru 81 miles Minera Las Bambas Not rated 9 USD Quadra 1/2 100% Chile 49 miles / 32 miles Sierra Gorda Not rated 11/11 USD5 Palmucho 100% Chile 6 miles Enel Generacion Chile BBB/-/BBB+ 14 USD5 Chile TL 3 100% Chile 50 miles CNE A/A2/A- n/a USD5 Chile TL 4 100% Chile 63 miles Several Mini-hydro plants Not rated 48 USD Skikda 34% Algeria 3.5 Mft3/day Sonatrach & ADE Not rated 10 USD5 Honaine 26% Algeria 7 Mft3/day Sonatrach & ADE Not rated 14 USD5 Tenes 51% Algeria 7 Mft3/day Sonatrach & ADE Not rated 16 USD5 Reflects the counterparties’ issuer credit ratings issued by S&P, Moody’s and Fitch, respectively, as of February 29, 2024. It refers to the credit rating of the Republic of South Africa. Diversified mix of 22 high credit quality clients (~41% A+ rating or higher, the rest unrated). AT A GLANCE Sizeable and Diversified Asset Portfolio Gross cash in euros dollarized through currency hedges. USD denominated but payable in local currency. As of December 31, 2023.

Great West House, GW1, 17th floor, Great West Road Brentford TW8 9DF London (United Kingdom)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Atlantica Sustainable Infrastructure plc

Date: February 29, 2024	By:	/s/ Santiago Seage
		Name:	Santiago Seage
		Title:	Chief Executive Officer