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-16UNDER THE   
                        SECURITIES EXCHANGE ACT OF 1934                         

                               Date: 23 May 2024                                

                       Commission File Number: 001-14958                        




                                                                                
                               NATIONAL GRID plc                                

                 (Translationof registrants name into English)                  

                               England and Wales                                

                         (Jurisdictionof Incorporation)                         





                  1-3 Strand, London, WC2N 5EH, United Kingdom                  
                     (Addressof principal executive office)                     





 Indicateby check mark whether the registrant files or will file annualreports  
                     under cover of Form 20-F or Form40-F.                      

                                                                                
                                    Form20-F                                    
                                                                                
                                    Form40-F                                    

 Indicateby check mark if the registrant is submitting the Form 6-K in paperas  
                          permitted by Regulation S-T                           
                                 Rule101(b)(1):                                 
                                                                                

 Indicateby check mark if the registrant is submitting the Form 6-K in paperas  
                          permitted by Regulation S-T                           
                                 Rule101(b)(7):                                 
                                                                                

Indicateby check mark whether the registrant by furnishing the informationcontai
 ned in this Form is also thereby furnishing the informationto the Commission   
                pursuant to Rule 12g3- 2(b) under theSecurities                 
                              ExchangeAct of 1934.                              
                                                                                
                                      Yes                                       
                                                                                
                                       No                                       

 IfYes is marked, indicate below the file numberassigned to the registrant in   
                       connection with Rule 12g3-2(b):n/a                       




                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                 EXHIBIT INDEX                                  
                                                                                

                                                                         Description
Exhibit No.                                                                         
                                                                                    
   99.1     Exhibit99.1 Announcement sent to the London Stock Exchange on 23 May2024
                                                                                    
                                           Rule 135c notification - 7bn Rights Issue

                                                                                
                                                                                
                                                                     Exhibit99.1
                                                                                
                                                                                
                                                                                
                                                           FOR IMMEDIATE RELEASE
                                                                                
                                                                     23 May 2024
                                                                                
                               National Grid plc                                
                                                                                
          7 for 24 fully underwritten Rights Issue to raise c.7billion          
                                                                                
                  New 5-year investment framework for FY25-29                   
                                                                                
                Deliver 60bn investment in energy infrastructure                
                                                                                
     To fund a significant step up in capital investment to around60 billion in 
                  energy network infrastructure, the Board ofNational Grid plc (
                                                                  "NationalGrid"
                                                                           orthe
                                                                       "Company"
  ) today announces a capital raise of approximately7 billion by way of a fully 
      underwritten Rights Issue of1,085,448,980 New Shares at 645 pence per New 
              Share on the basis of7 New Shares for every 24 Existing Shares(the
                                                                   "RightsIssue"
                                                                              ).
                                                                                
     National Grid's results for the year ended 31 March 2024 have beenreleased 
                                          today in an accompanying announcement.
                                                                                
                        SUMMARY OF BACKGROUND TO AND REASONS FOR THE RIGHTSISSUE
                                                                                
  National Grid plays a critical role in delivering the energytransition across 
             our jurisdictions, by building and maintainingthe transmission and 
           distribution infrastructure to enable theconnection of cleaner, more 
   affordable renewable energy. Not onlywill this enable the decarbonisation of 
    the economies we serve, itwill also ensure we can meet the demand growth we 
           anticipate from amore technology-enabled economy, as well as greater 
                                  electrificationof homes, heating and vehicles.
                                                                                
        The opportunities presented by the growth of electricity demand,and the 
         consensus among our regulators and jurisdictions of theurgent need for 
 decarbonisation are unprecedented. It's againstthis backdrop that we expect to 
          significantly increase our capitalinvestment over the next five years.
                                                                                
   Our geographic position and our work with governments andregulators provides 
          us with an unprecedented growth opportunitythat we expect will create 
   substantial value for our shareholders.This investment in new infrastructure 
     will enhance resiliency andenable the jurisdictions in which we operate to 
        make meaningfulprogress in their journeys towards a decarbonised energy 
system.The step-up in investment as set out in our new 5-year financialframework
  underscores National Grid's position as one of the FTSE'sbiggest investors in 
        the delivery of the energy transition. Overthe last three years we have 
    reshaped our portfolio and now have amix of businesses that is increasingly 
           weighted towards electricitytransmission and distribution, making us 
    well-placed to capture thesignificant network growth opportunities that lie 
        ahead. With ouroperational and regulatory capabilities, combined with a 
           strongtrack record of delivery, we are confident that we can deliver 
    thisstep-up in new infrastructure that will provide greater levels ofenergy 
   security and enable diversification of energy sources tohelp decarbonise the 
                                                             economies we serve.
                                                                                
                                                                                
                                                                                
   The Board unanimously believes that raising net proceeds ofapproximately 6.8 
      billion through the Rights Issue will givethe Group appropriate financial 
           flexibility to deliver the Group'sstrategy over the 5-year financial 
     framework, and funding clarityuntil at least the end of the RIIO-T3 period.
                                                                                
                                                                                
  The Rights Issue net proceeds of approximately 6.8 billionwill principally be 
 utilised to fund a higher-growth investmentphase for the Group, with around 60 
    billion of capitalinvestment expected during the 5-year period from FY25 to 
              FY29. Inthe near term, to support efficient management of funding 
 costs,approximately 750 million of the net proceeds will be used torefinance a 
   portion of the Group's outstanding hybrid bonds thathave first call dates in 
                                                             the next 15 months.
                                                                                
                                                                                
                                INDICATIVE SUMMARY TIMETABLE OF PRINCIPAL EVENTS
                                                                                

                                                                                                                                    
Issue...............................................................................................................................
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
....................................................................................................................................
                                                                                                                                    
                                                                                                             Announcement of Rights 
................................................................................................................................... 
                                                                                                                                    
                                                                                      Admission and commencement of dealings in New 
                                                                                      Shares, nil paid, onthe London Stock Exchange 
.......                         
                                                                                                                                    
             23 May 2024
                        
                        
8.00 a.m. on 24 May 2024
                        

                        

                                                                                
 It is expected that the dealings in the New Shares on the LondonStock exchange 
                        will commence at 8.00 a.m. (London time) on 12 June2024.
                                                                                
                                        FOR FURTHER INFORMATION, PLEASE CONTACT:
                                                                                
                                                                  National Grid:
                                                                                
                                                                       Investors

 Nick Ashworth +44 (0) 7814 355 590
  Angela Broad +44 (0) 7825 351 918
James Flanagan +44 (0) 7970 778 952

                                                                                
                                                                           Media

           Molly Neal +44 (0) 7583 102 727
Danielle Dominey-Kent +44 (0) 7977 054 575
        Lyndsey Evans +44 (0) 7714 672 052

                                                                                

 Brunswick                    
           +44 (0) 20 74045959
                SusanGilchrist
DanRoberts                    
PeterHesse                    

                                                                                
                                                                                
                                                               IMPORTANT NOTICES
                                                                                
      This announcement has been issued by and is the sole responsibilityof the 
       Company. The information contained in this announcement isfor background 
   purposes only and does not purport to be full orcomplete. No reliance may or 
    should be placed by any person for anypurpose whatsoever on the information 
          contained in thisannouncement or on its accuracy or completeness. The 
            information inthis announcement is subject to change without notice.
                                                                                
        This announcement is not a prospectus but an advertisement. Neitherthis 
 announcement nor anything contained in it shall form the basisof, or be relied 
             upon in conjunction with, any offer or commitmentwhatsoever in any 
                                                                   jurisdiction.
                                                                                
       This announcement does not contain or constitute an offer for saleor the 
   solicitation of an offer to purchase securities in theUnited States. The Nil 
    Paid Rights, the Fully Paid Rights and theNew Shares have not been and will 
         not be registered under the USSecurities Act of 1933, as amended (the "
                                                                   SecuritiesAct
       ") or under any securitieslaws of any state or other jurisdiction of the 
       United States andmay not be offered, sold, pledged, taken up, exercised, 
  resold,renounced, transferred or delivered, directly or indirectly, in orinto 
      the United States except pursuant to an applicable exemptionfrom, or in a 
 transaction not subject to, the registrationrequirements of the Securities Act 
     and in compliance with anyapplicable securities laws of any state or other 
       jurisdiction ofthe United States or other jurisdiction. There will be no 
      publicoffer of the Nil Paid Rights, the Fully Paid Rights, theProvisional 
    Allotment Letters or the New Shares in the UnitedStates. Subject to certain 
   limited exceptions, ProvisionalAllotment Letters have not been, and will not 
    be, sent to, and NilPaid Rights have not been, and will not be, credited to 
 the CRESTaccount of, any Qualifying Shareholder with a registered address inor 
   that is known to be located in the United States. None of theNew Shares, the 
    Nil Paid Rights, the Fully Paid Rights or theProvisional Allotment Letters, 
     this announcement or any otherdocument connected with the Rights Issue has 
         been or will beapproved or disapproved by the United States Securities 
   andExchange Commission or by the securities commissions of any stateor other 
   jurisdiction of the United States or any other regulatoryauthority, nor have 
      any of the foregoing authorities passed upon orendorsed the merits of the 
   offering of the New Shares, the Nil PaidRights, the Fully Paid Rights or the 
 accuracy or adequacy of theProvisional Allotment Letters, this announcement or 
       any otherdocument connected with the Rights Issue. Any representation to 
                          thecontrary is a criminal offence in the UnitedStates.
                                                                                
          The distribution of this announcement, the Prospectus, theProvisional 
    Allotment Letter and the offering or transfer of NilPaid Rights, Fully Paid 
    Rights or New Shares into jurisdictionsother than the United Kingdom may be 
             restricted by law, andtherefore persons into whose possession this 
announcement comesshould inform themselves about and observe any suchrestriction
                                                                              s.
                                                                                
           This announcement does not constitute a recommendation concerningany 
     investor's options with respect to the Rights Issue. The priceand value of 
 securities can go down as well as up. Past performanceis not a guide to future 
       performance. The contents of thisannouncement are not to be construed as 
       legal, business, financialor tax advice. Each shareholder or prospective 
             investor shouldconsult his, her or its own legal adviser, business 
  adviser,financial adviser or tax adviser for legal, financial, business ortax 
  advice. Acquiring investments to which this announcementrelates may expose an 
             investor to a significant risk of losing allof the amount invested.
                                                                                
                                                      FORWARD-LOOKING STATEMENTS
                                                                                
         This announcement contains certain statements that are neitherreported 
        financial results nor other historical information. Thesestatements are 
  forward-looking statements within the meaning ofSection 27A of the Securities 
      Act of 1933, as amended, and Section21E of the Securities Exchange Act of 
 1934, as amended. Thesestatements include information with respect to National 
             Grid's (theCompany) financial condition, its results of operations 
andbusinesses, strategy, plans and objectives. Words such as 'aims','anticipates
     ', 'expects', 'should', 'intends', 'plans', 'believes','outlook', 'seeks', 
        'estimates', 'targets', 'may', 'will','continue', 'project' and similar 
expressions, as well asstatements in the future tense, identify forward-lookings
            tatements. This document also references climate-related targetsand 
    climate-related risks which differ from conventional financialrisks in that 
 they are complex, novel and tend to involveprojection over long term scenarios 
which are subject tosignificant uncertainty and change. These forward-lookingsta
        tements are not guarantees of National Grid's future performanceand are 
  subject to assumptions, risks and uncertainties that couldcause actual future 
         results to differ materially from thoseexpressed in or implied by such 
     forward-looking statements ortargets. Many of these assumptions, risks and 
      uncertainties relateto factors that are beyond National Grid's ability to 
   control,predict or estimate precisely, such as changes in laws orregulations 
 and decisions by governmental bodies or regulators,including those relating to 
 current and upcoming price controls inthe UK and rate cases in the US, as well 
     as the future of systemoperation in the UK; the timing of construction and 
delivery bythird parties of new generation projects requiring connection;breache
   s of, or changes in, environmental, climate change andhealth and safety laws 
          or regulations, including breaches or otherincidents arising from the 
  potentially harmful nature of itsactivities; network failure or interruption, 
        the inability to carryout critical non-network operations and damage to 
       infrastructure,due to adverse weather conditions including the impact of 
     majorstorms as well as the results of climate change, due tocounterparties 
   being unable to deliver physical commodities;reliability of and access to IT 
        systems, including or due to thefailure of or unauthorised access to or 
       deliberate breaches ofNational Grid's systems and supporting technology; 
             failure toadequately forecast and respond to disruptions in energy 
supply;performance against regulatory targets and standards and againstNational 
      Grid's peers with the aim of delivering stakeholderexpectations regarding 
 costs and efficiency savings, as well asagainst targets and standards designed 
  to support its role in theenergy transition; and customers and counterparties 
      (includingfinancial institutions) failing to perform their obligations to 
  theCompany. Other factors that could cause actual results to differmaterially 
      from those described in this announcement includefluctuations in exchange 
  rates, interest rates and commodity priceindices; restrictions and conditions 
           (including filingrequirements) in National Grid's borrowing and debt 
    arrangements,funding costs and access to financing; regulatory requirements 
 forthe Company to maintain financial resources in certain parts of itsbusiness 
   and restrictions on some subsidiaries' transactions suchas paying dividends, 
    lending or levying charges; the delayed timingof recoveries and payments in 
 National Grid's regulated businesses,and whether aspects of its activities are 
        contestable; the fundingrequirements and performance of National Grid's 
       pension schemes andother post-retirement benefit schemes; the failure to 
 attract,develop and retain employees with the necessary competencies,including 
 leadership and business capabilities, and any significantdisputes arising with 
  National Grid's employees or breaches of lawsor regulations by its employees; 
        the failure to respond to marketdevelopments, including competition for 
       onshore transmission; thethreats and opportunities presented by emerging 
           technology; thefailure by the Company to respond to, or meet its own 
              commitmentsas a leader in relation to, climate change development 
             activitiesrelating to energy transition, including the integration 
  ofdistributed energy resources; and the need to grow the Company'sbusiness to 
         deliver its strategy, as well as incorrect orunforeseen assumptions or 
         conclusions (including unanticipatedcosts and liabilities) relating to 
      business development activity,including the sale of a stake in its UK Gas 
   Transmission andMetering business, its strategic infrastructure projects and 
  jointventures and the separation and transfer of the ESO to the publicsector. 
            For further details regarding these and other assumptions,risks and 
   uncertainties that may impact National Grid, please readthe Strategic Report 
    section and the 'Risk factors' on pages 226 to231 of National Grid's Annual 
 Report and Accounts for the yearended 31 March 2024, which is published today. 
      In addition, newfactors emerge from time to time and National Grid cannot 
   assessthe potential impact of any such factor on its activities or theextent 
 to which any factor, or combination of factors, may causeactual future results 
     to differ materially from those contained inany forward-looking statement. 
       Except as may be required by law orregulation, the Company undertakes no 
 obligation to update any ofits forward-looking statements, which speak only as 
                                                of the date ofthis announcement.
                                                                                
                                                                                
                                   SIGNATURE                                    
                                                                                
    Pursuant to the requirements of the Securities Exchange Act of1934, the     
    registrant has duly caused this report to be signed onits behalf by the     
                     undersigned, thereunto dulyauthorized.                     
                                                                                
                                                                                
                                                                                

           NATIONAL GRIDplc
                           
                           
 By:            Beth Melges
                           
                Beth Melges
     Head of Plc Governance
                           

                                                                                

                                                                           Date:
                                                                      23 May2024