California Proposes Mandatory Solar Panels on New Homes

Fortunately, that’s not the only change in their building regulations.

The California Energy Commission has just changed the building standards to require solar photovoltaic systems on all houses built after January 1, 2020. Here I would cue up my usual response and say “reducing demand is more important than increasing supply” but they do that too; Insulation in walls and attics is increased, window performance is improved, LED lighting is mandated and ventilation is improved. Commissioner Andrew McAllister says:

The buildings that Californians buy and live in will operate very efficiently while generating their own clean energy. They will cost less to operate, have healthy indoor air and provide a platform for ‘smart’ technologies that will propel the state even further down the road to a low emissions future.

There are the usual objections that it will increase the cost of housing (estimated to be $9,500 per house) but California houses go up by that much every month due to land prices, President Trump’s tariff on Canadian lumber caused a 7 percent increase, and you probably heard the same thing when indoor plumbing became mandatory. At least energy savings from building efficiency and solar panels pay for themselves eventually. In the FAQ they write: “Based on a 30-year mortgage, the Energy Commission estimates that the standards will add about $40 per month for the average home, but save consumers $80 per month on heating, cooling and lighting bills.

Lloyd Alter,

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