Depending on how it is produced, hydrogen could play a significant role in reducing greenhouse gases and pollution. This Spotlight examines some potential benefits and challenges to expanding its use. For example, hydrogen-powered cars are being built, but there aren't many places to refuel, and it can be expensive. Hydrogen can be mixed with natural gas to generate electricity, but it burns hot and may overheat conventional equipment. The federal government provides support for research and development that may help address these challenges. A 2021 law authorized up to $8 billion to help bring clean hydrogen to the market faster.