Barack Obama unveils new solar expansion plans as officials confirm White House panels are now operational.
A German engineer wants to turn an old mine, half a mile underground, into a giant battery.
The latest sign of solar’s move into the mainstream is at retail stores in five states.
Step inside the project that could be the key to Obama’s climate legacy… or a multibillion-dollar boondoggle.
Fix fracking. Crack down on coal. There’s still a lot POTUS can do.