BMW i4 vs Polestar 2: home charging cost

At the July 2026 Ofgem price cap (26.11p/kWh), the Polestar 2 costs less to charge — it is the cheaper of the two to run at 5.8p per mile vs 6.6p for the BMW i4 — a difference of about £77.57 over 10,000 miles of home charging.

Prices based on the Ofgem price cap of 26.11 p/kWh, effective 1 July 2026.Source: Ofgem

	BMW i4eDrive40	Polestar 2Standard Range Single Motor
Full charge cost	£23.94	£19.88
Cost per mile	6.6p	5.8p
20-80% on a 7 kW wallbox	6 hr 55 min	5 hr 45 min
Usable battery	80.7 kWh	67 kWh
WLTP range	367 miles	339 miles
Efficiency	4.5 mi/kWh	5.1 mi/kWh
Max AC charging	11 kW	11 kW

At a glance

Full charge cost (lower is better)

BMW i4£23.94

Polestar 2£19.88

Running cost per mile (lower is better)

BMW i46.6p

Polestar 25.8p

20-80% time on a 7 kW wallbox (lower is better)

BMW i46 hr 55 min

Polestar 25 hr 45 min

The bigger battery costs more to fill but is not necessarily more expensive to run — cost per mile depends on efficiency, not battery size. Costs include ~12% AC charging losses.