Just turn up
Ann and Matt have installed an Air Source Heat Pump for heating the house, extracting heat from the outside air, Solar PV panels produce electricity which can be used for free during the day; Any spare electricity generated is diverted to the hot water cylinder when not being used elsewhere in the house.
Rainwater Recovery with several water butts. Quick-flush toilet and a shower head which saves and filters water. Induction hob which saves electricity.