California changed the rules for the new houses – local authorities established new norms to promote and develop alternative sources of energy. The owners of the properties are obliged to equip their houses with solar batteries starting form 2020. However, there are some exceptions for the buildings where the panels establishment is impossible or not effective.
The new regulation implies new buildings to use just solar power. New standard will put additional expanses to the construction works – in average 30 000 dollars. However, it decreases expanses for energy essentially. Nowadays 15-20% of the houses are built this way in California.