*By Alisha Haridasani* California, the state most aggressively pursuing clean energy policies, became the first in the country to require almost all new homes have solar panels. The new rule, adopted by the California Energy Commission on Wednesday, will apply to all residential buildings up to three stories tall built after January 1, 2020. This change in the building code is expected to add around [$10,000](http://www.energy.ca.gov/title24/2019standards/documents/2018_Title_24_2019_Residential_Standards.pdf) to the cost of a new home. But the commission [estimated](http://www.energy.ca.gov/releases/2018_releases/2018-05-09_building_standards_adopted_nr.html) the panels could save home owners around $80 a month on utility bills, and will slash greenhouse gas emissions “by an amount equivalent to taking 115,000 fossil fuel cars off the road.” The requirement is part of California’s push to get half the state's electricity from renewable sources by 2030. The state already relies on renewables for around 25 percent of its electricity, and it is expected to rise to around 33 percent by 2020. The California Building Standards Commission must formally adopt the rule, which it is expected to do, said Mark Kaufman, Mashable’s science reporter. “California is really keen on solar, just like Texas is really keen on wind,” Kaufman said. Shares of solar companies, such as SunRun and First Solar, rallied on Thursday.

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