SECURITIES AND EXCHANGE COMMISSION

 

Washington D.C. 20549

 

_______________

 

FORM 6-K

 

REPORT OF FOREIGN ISSUER

 

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

 

THE SECURITIES EXCHANGE ACT OF 1934

 

Date:  24 August 2007

 

 

NATIONAL GRID plc

(Registrant’s Name)

 

1-3 Strand

London

WC2N 5EH

(Registrant’s Address)

 

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

 

 

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3- 2(b) under the Securities Exchange Act of 1934.

 

 

 

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

 

 

 

---

SIGNATURE

 

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 authorised.

 

 

 

Date: 24 August 2007

---

ANNEX 1 - SUMMARY

 

FORM 6-K

 

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

 

Report of Foreign Issuer

 

Pursuant to Rule 13a – 16 or 15d – 16 of

The Securities Exchange Act of 1934

 

Announcement issued to the London Stock Exchange on 24 August 2007

 

National Grid plc

1-3 Strand, London, WC2N 5EH,

United Kingdom

 

 

Announcements:

 

 

---

24 August 2007

 

National Grid plc

 

COMPLETION OF THE ACQUISITION OF KEYSPAN

 

National Grid is pleased to announce that it has completed the acquisition of KeySpan.

 

Contacts

 

National Grid:

 

Investors

 

Media