Scientists who want to understand what's beyond our solar system have designed an interstellar spacecraft that could go out farther and faster than the famous Voyager probes.
Duke Energy is rolling out a new program that clears the way for large customers to buy solar or wind energy from independent power producers.
Alabama has some of highest solar fees in the U.S. and critics say it's hurting solar customers. It's one of several states where utilities are proposing or raising fees for homes with rooftop solar.
That's the price for a solar energy package from Off-Grid Electric, who's lit up the homes of 100,000 people without electricity in Tanzania.
A black hole with about 17 billion times the mass of our sun has turned up in another remote galaxy. Astronomers now think these mass-eating monsters may not be so rare after all.
Renewable energy is taking off across the nation, but storing the energy is still a problem that is challenging companies to innovate, with solutions ranging from molten salt to ice.
Since Nevada regulators began phasing out incentives, the solar power business has been in turmoil and many workers have been laid off. Now some worry what happened there will spread to other states.
Is renewable energy worth the cost? This is a question being debated in Paris this week. Though there's no simple answer, in South Africa the verdict is in.
Half of the $1 billion in tax credits and other economic incentives that Buffalo is getting from the state is going to build a solar panel factory. Skeptics say it's a risky way to create jobs.