Report of Foreign Issuer (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

9 October 2015

Commission File Number: 001-14958

National Grid plc ———————————————————————————————————
(Translation of registrant’s name into English)

1-3 Strand London WC2N 5EH, England
——————————————————————————————————— (Address of principal executive office)

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

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: [ ] Yes [x] No

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

Please see Exhibit 99.1 - Announcement sent to the London Stock Exchange on 9 October 2015:-‘Determination of the initial conversion price of the non-dilutive convertible bonds due 2020’

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.

		National Grid plc

Date: 9 October 2015	By:	/s/ David Whincup
	Name:	David Whincup
	Title:	Assistant Company Secretary

EXHIBIT INDEX

Exhibit No.		Description

99.1		Announcement sent to the London Stock Exchange on 9 October 2015:-‘Determination of the initial conversion price of the non-dilutive convertible bonds due 2020’

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION IN OR INTO CANADA, JAPAN OR AUSTRALIA OR ANY OTHER JURISDICTION IN WHICH OFFERS OR SALES OF THE SECURITIES WOULD BE PROHIBITED BY APPLICABLE LAW

9 October 2015

Determination of the initial conversion price of the non-dilutive convertible bonds due 2020

As announced on 24 September 2015, National Grid North America, Inc. (“NGNA”) successfully placed £400 million non-dilutive convertible bonds due 2020 (the “Bonds”) with 0.90% coupon and a conversion premium of 30.0%.

The initial conversion price for the Bonds will be £11.9306, which represents a premium of 30.0% above the share reference price, which was determined (by reference to National Grid plc’s share reference price in the manner described in the 24 September 2015 announcement) to be £9.1774.

DISCLAIMER

This announcement may not be forwarded or distributed to any other person and may not be reproduced in any manner whatsoever. Any forwarding, distribution or reproduction of this announcement in whole or in part is unauthorised. Failure to comply with this directive may result in violation of the United States Securities Act of 1933, as amended (the “Securities Act”) or the applicable laws of any such other jurisdiction.

This announcement is not an offer of securities for sale in the United States. The securities to which this announcement relates have not been registered under the Securities Act and may not be offered or sold in the United States or to, or for the account or benefit of, U.S. persons, absent registration or an exemption from registration under the Securities Act. There will be no public offering of the securities in the United States.

This announcement has been prepared solely for information purposes and is not an offer (or a solicitation of an offer) to buy or sell any securities in any jurisdiction.

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