7.09pm GMT

We will have to wait another day to hear full evidence from Andrew Wright at Ofgem, who is asked to come back later.

Quick summary: Energy bosses defended their price increases and argued for green levies to be moved off customers' bills and into general taxation.

Tony Cocker of E.ON said he had called on the prime minister to launch a competition investigation.

I fundamentally believe that this market is competitive but I acknowledge we are not trusted and therefore I believe we need to have a very thorough competition commission investigation.

Andrew Wright of Ofgem said the regulator had launched "the most significant reforms" since competition was introduced.

John Robertson for Labour accused the companies of failing to protect their most vulnerable customers.

There are thousands of people dying because of government policy... and the big reason is they die of hypothermia because they can't afford to put the heating on. To just say you move them on to prepayment because they cannot afford to protect their bills, sorry, you need to do more to protect them.

That's all from me today. Thank you for following and join us tomorrow for more rolling news on the Guardian business blog.