Diesel farms make fresh bids to supply National Grid back-up power

Polluting generators could win multimillion-pound contracts, with some also eligible for generous tax breaksThe owner of Britain’s energy network is gearing up to buy more power from suppliers to ensure the country’s lights stay on, with polluting diesel generators among the providers vying for contracts.The National Grid needs back-up electricity sources that kick in when, for instance, demand is high but the weather is not breezy enough to power wind farms. It secures this back-up