While shifting the debate towards green levies, the Big Six have remained much quieter about their healthy profits.
The Deputy PM vowed in his conference speech that the Lib Dems "will keep this government green" - and he meant it.
The Labour leader may need to move some of the cost of energy efficiency schemes from consumer bills to taxation.
The energy companies are squealing over the Labour leader's proposed freeze on energy prices, warning of blackouts. They ignore the fact that the lights are already going out - for the 4.5 million people living in fuel poverty.
There are clear conflicts of interest over the sources of the government’s advice on fracking. In 2012, Cameron was committed to renewable energy - what changed?
The amendment would provide the certainty for which the energy industry is calling and keep the UK on track to meet its legally binding carbon targets at the lowest cost.
The Chancellor's plans will cost bill payers £25bn more in the 2020s than developing low-carbon energy and breach the UK's climate change targets.
A tariff is not "the lowest" if it's the only one available.
Osborne's dogmatism will keep Britain hooked on expensive foreign imports and do nothing to tackle high fuel bills.
Mike Stephenson, British Geological Survey