This Boston startup created renewable energy storage that’s 10 times cheaper than lithium-ion batteries

Fourth Power’s energy-storing technology is a winner in Fast Company’s 2024 World Changing Ideas Awards.

Inside a lab near Boston, big blocks of carbon—each six feet long, two feet tall, and weighing more than a ton—will soon be stacked into a system that will heat them up to a glowing-hot 4,350 degrees Fahrenheit. It’s a demo of new technology designed to dramatically cut the cost of storing renewable energy.