Both npower and Scottish Power today refused to reveal whether they are planning any price increases.

On Friday, British Gas said it would be raising prices by 7%, while SSE has also already unveiled hikes of 9%. EDF, meanwhile, has introduced a price freeze for the winter.

With consumer groups now keenly watching what the remaining three players of the UK’s ‘Big Six’ will do, ELN today contacted them.

But an npower spokesperson said the company “never comments on pricing speculation”, while Paul Ferguson of Scottish Power said the company was continuing “to monitor our prices in a very competitive market” but would not be drawn on any potential rises. A spokesperson for E.ON was unavailable for comment.

A spokesperson for Ofgem said it was “watching these developments carefully. So far, a number of suppliers have yet to show their hand.”