(Reuters) – Britain’s National Grid ESO has for the first time awarded a contract to an offshore wind farm to help keep voltage levels in the power network stable, it said on Monday. The transmission assets of the Dogger Bank C offshore wind farm will provide 200 megavolt amperes of reactive power (MVAr), which is used to maintain network stability, for a 10-year period from 2024, National Grid said. This will help stabilise voltage on the grid in the northeast of England after the expected closure of Hartlepool nuclear power station in March 2024, it said. “Reactive power capability is vital …