[stordoff]

I disagree - charging for usage (even if most of your costs come from capacity) incentivises people to use less power, which means you need less grid capacity and reduces externalities (pollution due to generating). If I'm paying for 100A _regardless_, for the things I need to run at peak (say kettle+washing machine+hoover), there's little incentive to reduce my usage at other times (switching lights/devices off when they aren't in use); if I'm paying for usage, there's a very direct incentive to turn things off I'm not using (it's costing me money).