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Npower has apologised after sending a woman a £6,600 bill and threatening her with legal action – when the money was actually owed by someone else with the same name. Sarah, whose second name we've withheld so as not to identify her, received a letter from Npower last week marked 'FINAL NOTICE before legal action', which told her she owed the company £6,623.43 – even though her energy isn't supplied by Npower. When she received the bill, Sarah said she felt "physically sick" and struggled to get in touch with an Npower adviser – but after MoneySavingExpert stepped in, the company admitted the letter had been sent to the wrong person entirely, and was intended for one of its customers with the same name. It has now apologised and offered Sarah a goodwill payment. See our Energy mis-selling guide for how to complain if you've been left out of pocket by an incorrect energy bill.

Energy regulator Ofgem is to trial a collective deal for 50,000 customers who haven't switched for more than three years - but you needn't wait to save.

Npower is running a trial that could see an end to its standard variable tariff – for the first time it's moving some customers onto another fixed deal at the end of their current contract. But most could still save by switching.

The big six energy companies – EDF, Eon, British Gas, Scottish and Southern Energy, Scottish Power and Npower – have agreed to write to customers every year to tell them the firm's best tariffs for them and how to get it, the Government will announce today.