Precisely - for a smallish 120sqm house the passivhaus heat demand is 1800kWh. 3000kWh is not unreasonable for additional electricity consumption. With a heat p

Precisely - for a smallish 120sqm house the passivhaus heat demand is 1800kWh. 3000kWh is not unreasonable for additional electricity consumption. With a heat pump that heat demand should pessimistically translate into <1000kWh electricity, giving us a total energy usage of ~4000kWh. That's about what a medium size (~20sqm) south-facing roof-mounted PV installation would achieve in the south of the UK.