Creating the tons of steel and concrete we use to build our world requires a massive amount of heat—and most of it comes from burning dirty fossil fuels. HelioHeat cleans up that process by using the power of the sun. Here’s how it works: A field of 100,000 motorized, computer-controlled mirrors concentrates sunlight in the direction of a 40-m-tall tower, “like a giant magnifying glass,” says Heliogen founder Bill Gross. There, a hot spot gets up to 2,000°F, where the heat can be harnessed to melt steel or make cement or electricity. Future iterations of the tech, says Gross, could use the sunlight to create hydrogen to power zero-emission automobiles. —Jesse Will
More Must-Reads from TIME
- Donald Trump Is TIME's 2024 Person of the Year
- Why We Chose Trump as Person of the Year
- Is Intermittent Fasting Good or Bad for You?
- The 100 Must-Read Books of 2024
- The 20 Best Christmas TV Episodes
- Column: If Optimism Feels Ridiculous Now, Try Hope
- The Future of Climate Action Is Trade Policy
- Merle Bombardieri Is Helping People Make the Baby Decision
