By ESTHER WHIELDON for Politico:  Harry Reid’s home state dealt a lethal blow Tuesday to rooftop solar power — the latest skirmish of a nationwide green energy battle that has pitted the Senate Democratic leader against his favorite target, the Koch brothers.

The move by Nevada’s utility regulator, which voted to slash the economic incentives for homeowners to install solar panels, was most immediately a showdown between billionaires Warren Buffett, owner of the state’s largest power company, and Elon Musk, whose SolarCity is the nation’s largest installer of panels that create electricity from the sun. But it also served as a proxy fight in a national struggle about states’ green energy programs, in which free-market groups backed by industrialists Charles and David Koch have fought to roll back incentives that they argue distort the marketplace and force some customers to subsidize other people’s power choices.  Cont'd...