I don't disagree, but I think it is more complex than a simple tiering system. For example, where I live we have no mains gas, so heating is typically oil. Trying to be environmentally minded I've installed heat pumps to do the hot water and space heating. Add in an electric car as well.

Taking this approach would punish us for trying to move away from direct fossil fuel consumption (I'm aware that much electricity still comes form fossil fuels).

So there is a lot of nuance in the proposal - allowances for electric cars, heat pumps (which the government is actively encouraging), mains gas, etc. Do each of these affect the basic needs?

An alternative that crossed my mind was to change the unit price based on house hold income. Higher income households would pay a higher rate per kWh, which I think would be considered progressive. Can't see the Tories ever going for that though.