英国国家电网公司 2026年年度报告和过渡报告

FORM 20-F (Mark One)£REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934ORRANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended 31March 2026OR£TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934OR£SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934Date of event requiring this shell company reportFor the transition period fromto NATIONAL GRID PLC(Exact name of Registrant as specified in its charter)England and Wales(Jurisdiction of incorporation or organization)1-3 Strand, London WC2N 5EH, England(Address of principal executive offices)Justine Campbell011 44 20 7004 3000Facsimile No. 011 44 20 7004 3004Group General Counsel and Company SecretaryNational Grid plc1-3 Strand London WC2N 5EH, England(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person) Securities for which there is a reporting obligation pursuant to Section15(d) of the Securities Exchange Act of 1934:None. The number of outstanding shares of each of the issuer’s classes of capital or common stock as of 31 March 2026 was 5,198,968,690Ordinary Shares of 12pence each204/473 Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act: YesRNo£ If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Yes£NoR Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorterperiod that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days: YesRNo£ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule 405 of Regulation S-T(§ 232.405of this chapter) during thepreceding 12 months (or for such shorter period that the registrant was required to submit such files).: YesRNo£ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or an emerging growth company. See definition of “large accelerated filer” “acceleratedfiler” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Accelerated filer£Emerging growth company£ Large accelerated filerRNon-accelerated filer£ If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐† †The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012. Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b)of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.R If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officersduring the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing: U.S. GAAP£International Financial Reporting Standards as issued by the International Financial Reporting StandardsROther£ If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow. Item 17£Item 18£ If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes£NoR This constitutes the annual report on Form 20-F of National Grid plc (the “Company”) in accordance with the requirements of the US Securities and Exchange Commission (the “SEC”) for the year ended 31March 2026 and is dated 3 June 2026. Details of events occurring subsequent to the approval of the annual report on 13 May 2026 are summarised in section “Further Information” which forms a part of this Form20-F. The content of the Group’s website (www.nation