National Grid Regulatory News (NG.)

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Mike Westcott

2

Reason for the notification

a)

Position/status

Group HR Director

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 33.33% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Alison Kay

2

Reason for the notification

a)

Position/status

Group General Counsel & Company Secretary

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 33.33% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Andrew Bonfield

2

Reason for the notification

a)

Position/status

Finance Director

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 50% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

John Pettigrew

2

Reason for the notification

a)

Position/status

Chief Executive Officer

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 50% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Nicola Shaw

2

Reason for the notification

a)

Position/status

Executive Director, UK

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 50% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

George Mayhew

2

Reason for the notification

a)

Position/status

Corporate Affairs Director

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

Ordinary shares of 12 204/473p each

GB00BDR05C01

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") Ordinary shares were purchased in the market under the APP. This Award relates to 33.33% for 2016/17 being paid in shares, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

London Stock Exchange (XLON)

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Dean Seavers

2

Reason for the notification

a)

Position/status

Executive Director, US

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

American Depository Shares

US 6362744095

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") American Depository Shares ("ADS") were purchased in the market under the APP. This Award relates to 50% for 2016/17 being paid in ADSs, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

Outside a trading venue

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20

1

Details of the person discharging managerial responsibilities / person closely associated

a)

Name

Richard Adduci, Jr

2

Reason for the notification

a)

Position/status

Chief Information Officer

b)

Initial notification /Amendment

Initial notification

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

National Grid plc

b)

LEI

8R95QZMKZLJX5Q2XR704

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial instrument, type of instrument

Identification code

American Depository Shares

US 6362744095

b)

Nature of the transaction

Under the National Grid plc Annual Performance Plan ("APP") American Depository Shares ("ADS") were purchased in the market under the APP. This Award relates to 33.33% for 2016/17 being paid in ADSs, which (after tax on the gross award) must be retained until shareholding requirement is met, and in any event for two years after receipt.This award is subject to clawback and malus provisions.

c)

Price(s) and volume(s)

d)

Aggregated information

- Aggregated volume

- Price

e)

Date of the transaction

2017.06.15

f)

Place of the transaction

Outside a trading venue

Name of officer of issuer responsible for making notification: Robin Kerner.

Date of notification: 2017.06.20