A broad group, encompassing utilities and retailers and free-market Republicans, may be forming to battle a bid by U.S. solar manufacturers to raise trade barriers against foreign solar products.

A decision by Microsoft Corp. to leave a local utility and buy its own renewable power raises a question for other big companies: If your goal is to green the grid, is it better to act on your own or to work within the system?

One of the two solar manufacturers who filed a controversial trade complaint with the Trump administration has gotten emergency money so it can stay in business.

Will President Trump keep up the effort to make solar energy cheaper? That question has swirled around the SunShot Initiative, a program with a doubtful future under a new president who thinks the government has unfairly tipped the scales away from coal.

If Donald Trump is not interested in climate change, a growing number of American governors, mayors and CEOs are. But their pinpoint efforts on global warming raise a nagging question: How much carbon can they really cut?