Western states are figuring out how to make electricity-sharing work, but it isn’t easy. Texas learned that the hard way.

As US gas prices climb, politicians are looking at ways to lower them. An economist breaks down what does − and doesn’t − move the number on the sign at the gas station.

Countries don’t just switch from fossil fuels to renewable energy sources. Each takes its own path, depending on its economy, international trade relations and government stability.

Nations’ stores of petroleum can dampen price shocks in the short term, but as reserve supplies dwindle, economic pain may continue.