Tucson Electric Power, Arizona Public Service and Salt River Project jointly announced a proposal Wednesday that could have a ...

Arizona's three largest electric utilities will jointly explore expanded nuclear-power options. A new plant here could be ...

Japan's nuclear plants faced global scrutiny after the devastating 2011 tsunami triggered by a 9.0 magnitude earthquake.

Armed with measuring devices, groups of citizens are embracing science to monitor radioactive fallout — and regain control of ...

Constellation, the nation’s largest operator of nuclear power plants, said Friday it agreed to purchase Calpine Corp. for $16.4 billion through 50 million shares of Constellation stock and $4.5 ...