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\n\n

\n\nUNITED STATES

\n\nSECURITIES AND EXCHANGE COMMISSION

\n\nWashington D.C. 20549

\n\n\n

\n\n

\n\nFORM 6-K

\n\n\n

\n\n

\n\nREPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16\nUNDER THE SECURITIES EXCHANGE ACT OF 1934

\n\nDate: 05 October 2026

\n\nCommission File Number: 001-14958

\n\n\n

\n\n

\n\nNATIONAL GRID plc

\n(Translation\nof registrant’s name into English)

\n\nEngland and Wales

\n(Jurisdiction\nof Incorporation)

\n\n\n

\n\n

\n\n1-3 Strand, London, WC2N 5EH, United Kingdom

\n(Address\nof principal executive office)

\n\n\n

\n\n

\nIndicate\nby check mark whether the registrant files or will file annual\nreports under cover of Form 20-F or Form 40-F.

\n\n☒ Form 20-F ☐ Form 40-F

\nIndicate\nby check mark if the registrant is submitting the Form 6-K in paper\nas permitted by Regulation S-T Rule\n101(b)(1): ☐

\nIndicate\nby check mark if the registrant is submitting the Form 6-K in paper\nas permitted by Regulation S-T Rule\n101(b)(7): ☐

\nIndicate\nby check mark whether the registrant by furnishing the information\ncontained in this Form is also thereby furnishing the information\nto the Commission pursuant to Rule 12g3- 2(b) under the Securities\nExchange Act of 1934. ☐ Yes ☒ No

\nIf\n“Yes” is marked, indicate below the file number\nassigned to the registrant in connection with Rule 12g3-2(b):\nn/a

\n\n\n

\n\n

\n\nEXHIBIT INDEX

\n\n\n\n\n\n\n

\n \n\nExhibit No. \n\n	\n \nDescription \n\n
\n \n\n99.1 \n\n	\n \nExhibit\n99.1 Announcement sent to the London Stock Exchange on 05 October\n2026 —\nPre-Close Update Ahead of HY2026/27 Results \n

\nExhibit\n99.1

\n\n5 October 2026

\n\nNational Grid plc

\n\nPre-Close Update Ahead of 2026/27 Half Year Results

\n\nNational Grid today issues a pre-close update for the six months\nended 30 September 2026, ahead of announcing half year results on 5\nNovember. Overall, the Group's regulated businesses continue to\nperform in line with our expectations, but a strong first half\nperformance in National Grid Ventures & Other means we now\nexpect to be slightly above our FY27 EPS growth guidance of 13-15%.\nAs usual, underlying EPS is expected to be weighted to the second\nhalf of the year.

\n\nThe profile of half year Group operating profit is also\nexpected to be broadly consistent with the prior\nyear:

\n●

In\nUK Electricity Transmission and UK Electricity Distribution, we\nanticipate operating profit to be broadly evenly split across the\nyear, consistent with FY26.

\n●

In\nour US regulated businesses, operating profits are expected to be\nweighted to the second half in line with the usual seasonality. In\nNew England, we expect a return to a more typical seasonality\nprofile following the one-off impact of the FERC RoE judgement in\nthe second half of FY26.

\n●

National\nGrid Ventures & Other activities is expected to deliver\nc.£130 million of additional performance in the first half\nrelative to our expectations, reflecting significant one-off fair\nvalue gains following two successful capital market transactions\nwithin the NG Partners investment portfolio and stronger\nperformance in our interconnectors business.

\n\nClosing half year net debt is expected to be broadly in line with\nour guidance for the full year after updating for the impact of the\nJoulent investment and reflecting the weighting of operating cash\nflows to the second half.

\n\nOur half year results will be announced on Thursday, 5 November\n2026.

\n\nEnquiries and contacts

\n\nInvestors and Analysts:

\n\n\n\n\n\n\n

\nAndrew\nDowney

\n\n

\n\n+44 (0) 7926 285 683

\n\n

\nTom\nEdwards

\n\n

\nCerys\nReece

\n\n+44 (0) 7976 962 791

\n\n

\n\n+44 (0) 7860 382 264

\n\nMedia:

\n\n\n\n

\nIlltud\nHarri

\n\n

\n\n+44 (0) 7920 503 600

\n\n

\n\nCAUTIONARY STATEMENT

\n\nThis announcement contains certain statements that are neither\nreported financial results nor other historical information. These\nstatements are forward-looking statements within the meaning of\nSection 27A of the Securities Act of 1933, as amended, and Section\n21E of the Securities Exchange Act of 1934, as amended. These\nstatements include information with respect to National\nGrid’s (the Company) financial condition, its results of\noperations and businesses, strategy, plans and objectives. Words\nsuch as ‘aims’, ‘anticipates’,\n‘expects’, ‘should’, ‘intends’,\n‘plans’, ‘believes’, ‘outlook’,\n‘seeks’, ‘estimates’,\n‘targets’, ‘may’, ‘will’,\n‘continue’, ‘project’ and similar\nexpressions, as well as statements in the future tense, identify\nforward-looking statements. This announcement also references\nsustainability-related targets and sustainability-related risks\n(including climate-related targets and climate-related risks) which\ndiffer from conventional financial risks in that they are complex,\nnovel and tend to involve projection over long term scenarios which\nare subject to significant uncertainty and change. These\nforward-looking statements and targets are not guarantees of\nNational Grid’s future performance and are subject to\nassumptions, risks and uncertainties that could cause actual future\nresults to differ materially from those expressed in or implied by\nsuch forward-looking statements and targets. Many of these\nassumptions, risks and uncertainties relate to factors that are\nbeyond National Grid’s ability to control or estimate\nprecisely, such as changes in laws or regulations and decisions by\ngovernmental bodies or regulators, including those relating to\ncurrent and upcoming price controls in the UK and rate cases in the\nUS; the timing of construction and delivery by third parties of new\ngeneration projects requiring connection; breaches of, or changes\nin, environmental, climate change and health and safety laws or\nregulations, including breaches or other incidents arising from the\npotentially harmful nature of its activities; network failure or\ninterruption, the inability to carry out critical non-network\noperations and damage to infrastructure, due to adverse weather\nconditions including the impact of major storms as well as the\nresults of climate change, due to counterparties being unable to\ndeliver physical commodities; reliability of and access to IT\nsystems, including due to the failure of or unauthorised access to\nor deliberate breaches of National Grid’s systems and\nsupporting technology; failure to adequately forecast and respond\nto disruptions in energy supply; performance against regulatory\ntargets and standards and against National Grid’s peers with\nthe aim of delivering stakeholder expectations regarding costs and\nefficiency savings, including affordability considerations, as well\nas against targets and standards designed to support its role in\nthe energy transition; and customers and counterparties (including\nfinancial institutions) failing to perform their obligations to the\nCompany. Other factors that could cause actual results to differ\nmaterially from those described in this announcement include\nfluctuations in exchange rates, interest rates and commodity price\nindices; restrictions and conditions (including filing\nrequirements) in National Grid’s borrowing and debt\narrangements, funding costs and access to financing; regulatory\nrequirements for the Company to maintain financial resources in\ncertain parts of its business and restrictions on some\nsubsidiaries’ transactions such as paying dividends, lending\nor levying charges; the delayed timing of recoveries and payments\nin National Grid’s regulated businesses, and whether aspects\nof its activities are contestable; the funding requirements and\nperformance of National Grid’s pension schemes and other\npost-retirement benefit schemes; the failure to attract, develop\nand retain employees with the necessary competencies, including\nleadership and business capabilities, and any significant disputes\narising with National Grid’s employees or breaches of laws or\nregulations by its employees; the failure to respond to market\ndevelopments, including competition for onshore transmission; the\nthreats and opportunities presented by emerging technology,\nincluding AI; the risk that global actions may not be effective in\ntransitioning to net zero and in managing relevant ESG risks,\nincluding in particular climate, nature-related and human rights\nrisks; the failure by the Company to respond to, or meet its own\ncommitments as a leader in relation to, climate change development\nactivities relating to energy transition, including the integration\nof distributed energy resources, which may result in the\nCompany’s failure to achieve the expected benefits of its\nstrategic priorities; and the need to grow the Company’s\nbusiness to deliver its strategy, as well as incorrect or\nunforeseen assumptions or conclusions (including unanticipated\ncosts and liabilities) relating to business development activity,\nincluding its strategic infrastructure projects and joint venture\ninvestments. For further details regarding these and other\nassumptions, risks and uncertainties that may affect National Grid,\nplease read the Strategic Report section and the ‘Risk\nfactors’ on pages 227 to 231 of National Grid’s Annual\nReport and Accounts for the year ended 31 March 2026. In addition,\nnew factors emerge from time to time and National Grid cannot\nassess the potential impact of any such factor on its\nactivities or the extent to which any factor, or combination of\nfactors, may cause actual future results to differ materially from\nthose contained in any forward-looking statement. Except as may be\nrequired by law or regulation, the Company undertakes no obligation\nto update any of its forward-looking statements, which speak only\nas of the date of this announcement.

\n\nSIGNATURE

\n\nPursuant to the requirements of the Securities Exchange Act of\n1934, the registrant has duly caused this report to be signed on\nits behalf by the undersigned, thereunto duly\nauthorized.

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

\n\n	\n \nNATIONAL GRID\nplc \n\n
\n\n	\n\n	\n\n
\n\n	\n \n\nBy: \n\n	\n \n\nBeth Melges \n\n
\n\n	\n\n	\n \n\nBeth Melges \n \n\nHead of Plc Governance \n\n

\nDate:\n05 October\n2026

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