Couldn't reconcile "...recharge in 3.5 minutes at West Ealing station between trips, using a _2,000kW_ charger 🤯 ..." and "...less impact on local electricity grids..." in the beeb article until I read this [in WP⬇️]:
"In March 2024, following delivery of unit 230001 to GWR, trial running began of the new battery-powered train and fast-charge technology on the line. The trials demonstrated a charging time of 3½ minutes at West Ealing, using _⚡a bank of batteries installed adjacent to the platform, which charge continuously at a lower current⚡_, removing the need for expensive upgrades to the local supply network." [en.wikipedia.org/wiki/Greenford_branch_line#Introduction_of_battery-powered_rolling_stock]