Simples!
How's about this for a simple idea; I know govt's don't like those as there are no foundations for ivory towers. How's about a rising scale of price for power usage? At present the more you use the less you pay, your first kWh costs plenty, your 100th a bunch less. Big (domestic) users get power at a lower cost than a granny with a fridge & a TV.
Billing is not complex, no need to change a thing. "polluter pays"
As far as electric cars, windmills, biomass, barrages, tidal, solar, carbon taxes - all bollocks I'm afraid unless we live in caves and animal skins. Bad science driven by equally poor data collection and interpretation and not forgetting the lovely grants and irrational fear.