Soaring temperatures across California and a request to cut back on power usage this week raised questions about the reliability of the state’s electricity grid. Governor Newsom says temporarily extending the life of California’s Diablo Canyon nuclear plant near San Luis Obispo could improve grid reliability but at a cost. Then, a series of classic children’s books is finding new life on stage and in the wilderness of East County. And, in our weekend preview, a play about a fictional female libido enhancement drug, visual art, the Union-Tribune Festival of Books and some nostalgic rock.