California's solar mandate is sparking a new energy debate

Solar panels on a home
Photo: Killan O'Sullivan/View Pictures via Getty Images

Following up: California's mandate that new single-family homes and small multi-family dwellings must come with solar panels starting in 2020 has touched off a dispute among climate advocates about whether it's a good idea.

Why it matters now: State and local policy is where the action is, as the White House has generally abandoned federal climate policies. Meanwhile, California's initiatives could bolster similar efforts in other states as solar continues to get ever cheaper, which expands the menu of policy options.