31/05/2026
A UK household combining solar, battery storage, a heat pump, and an electric vehicle reduced total emissions by 73%, cutting from 2.5 tonnes to 0.7 tonnes for home energy, with similar reduction from car use.
Energy costs also shifted. EV running costs dropped from £1,400 for petrol to around £400 using electricity at 17p per kWh, with further reduction from solar charging. Home energy costs fell by 36%, from £1,900 to £1,200 annually.
Battery use changed by season. In summer, stored solar covered evening demand. In winter, off peak tariffs allowed electricity to be stored at ~16p per kWh, with around 83% of usage shifted to lower cost periods despite ~10% storage losses.
Total electricity usage increased from 2,800 to 9,100 kWh per year as gas consumption was removed, showing how energy demand shifts when heating and transport move to electric systems.
