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National Grid PLC (LSE:NG.) has appointed Zoë Yujnovich, former Shell PLC (LSE:SHEL, NYSE:SHEL) gas and upstream director, as its new chief executive as John Pettigrew retires after almost 10 years in the role.

After a strong run, UBS thinks National Grid PLC (LSE:NG.) has run out of steam.

National Grid PLC (LSE:NG.) has proposed a higher return on equity to reflect increased capital investment for its Upstate New York electric and natural gas distribution business Niagara Mohawk Power Corporation (NIMO).

Britain's National Grid said on Monday it had filed a three-year rate plan proposal with the New York Public Service Commission for its upstate New York electric and natural gas distribution business.

National Grid PLC (LSE:NG.) said its financial performance for the past year to March was in line with guidance provided at its interims, on a constant currency basis.

Britain's energy regulator Ofgem said on Thursday it was considering whether to reject a penalty exemption application for an electricity transmission joint venture between National Grid and SP Transmission.

Heathrow — Europe's busiest airport — closed down on Friday for most of the day after a fire broke out at a nearby electrical substation. In comments first reported by the Financial Times on Sunday, National Grid CEO John Pettigrew said two other substations supplying power to Heathrow had been operating as normal on Friday.

The UK's energy regulator has approved a smaller-than-expected £4 billion of investment for the country's three transmission owners owned by National Grid PLC (LSE:NG.), SSE PLC (LSE:SSE) and Scottish Power to build out the electricity grid.