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Across
  1. 3. Key metal in LFP grid-scale batteries
  2. 6. Turns DC power into AC power
  3. 8. A billion watts of power
  4. 9. Corn-based renewable fuel
  5. 10. Energy tapped from the earth's own heat
Down
  1. 1. Carbon-free power from splitting atoms
  2. 2. Blades spin it to turn wind into power
  3. 4. Lightest element, and a clean fuel
  4. 5. Rooftop ___ panel
  5. 7. Main component of natural gas and biogas