The median age of Arizonans has only been increasing over the past decade. Here's which counties are the oldest and youngest in the state.

The Golden State is counting on 25 gigawatts, or about 13% of its electricity, from offshore projects by 2045.

Renewable energy advocates have long called for building battery complexes to store intermittent solar and wind energy, but a recent fire that spewed toxic heavy metals all around a California battery ...