National Grid plc ("NG")

9th January 2012

Notification of Directors' Interests

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NG SHARE INCENTIVE PLAN (the "SIP")

Under the SIP, operated through ACS HR Solutions UK Ltd as Trustee, employees may acquire NG ordinary shares by regular monthly contributions. The current monthly purchase of 45,597 NG ordinary shares under the scheme was confirmed by the Trustee today, the shares having been purchased in the market on 9thJanuary, at a price of 617 pence per share, on behalf of some 3,000 participants.

The following Executive Directors of NG are beneficiaries of the shares purchased on their behalf:

Director

Shares purchased in SIP

Steven Holliday

21 Ordinary Shares

Andrew Bonfield

20 Ordinary Shares

The Directors total interests after these events are:

Director

Resulting total interest

Steven Holliday

2,186,436      Ordinary Shares

Andrew Bonfield

498,780      Ordinary Shares

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Contact: Robin Kerner, Assistant Secretary, Shareschemes (0207 004 3223).

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