A start-up in Finland unveils the world’s first commercial heat storage system using sand to solve the problem of the variability of solar and wind power.

Good-paying jobs are a selling point with renewable energy projects. In Massachusetts, training programs are popping up to get people ready.

The answer is to build more transmission lines, so that customers can see the benefit, in the form of cheaper utility bills.

Despite being doubted for intermittency, wind and solar are delivering a lot of the state’s electricity supply.

Some say lawmakers are trying to solve 21st century problems with 20th century solutions.

The war in Ukraine is forcing the U.S. to reconsider its dependence on oil.

Solar, wind and nuclear energy confront old and new obstacles to competing with fossil fuels.

“On the supply side, it’s very clear that they were not planning for such a high demand,” one expert told us.

The number of proposed solar projects has spiked as costs have declined, but the transmission system can’t accommodate them.

A small British company says it is on track to decarbonize the economy with an abundant, safe and cheap source of energy — eventually.