National Grid (NGG) 6-K Current report (foreign)

Exhibit 99.1

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

Announcements sent to the London Stock Exchange

National Grid plc, 1-3 Strand, London, WC2N 5EH, United Kingdom

Update - Routine announcements in the period to 10 December 2018

10 December 2018	Director/PDMR Shareholding
5 December 2018	Director/PDMR Shareholding
3 December 2018	Total Voting Rights
27 November 2018	Holding(s) in Company
23 November 2018	Publication of Supplementary Prospectus
19 November 2018	Holding(s) in Company
16 November 2018	Regulatory filings in Massachusetts & New York

Note: During the period a ‘same day’ Form 6-K was issued in respect of the following National Grid plc announcements:

Note: During the period a ‘same day’ Form 6-K was issued in respect of the following National Grid plc announcements:

29 November 2018 Scrip Dividend for 2018/19 Interim Dividend