Energy

3. Extremely hot, ionized gas where electrons are stripped from nuclei.
7. Wind is technically a form of this energy type.
10. Ions of this element move through the electrolyte in a fuel cell.
11. An isotope of hydrogen that has one proton and one neutron.
13. VAPOR The only byproduct when hydrogen is used in a fuel cell.
15. Location of the largest PV systems in the country.
16. The facility containing the generator and turbine in a hydro plant.
17. Wind systems serving local demand for homes or schools.
18. The positive electrode in a fuel cell.
19. An "always on" energy source that provides a constant power supply.
20. Turbines that do not need to be adjusted to point into the wind to operate.
21. Component used to manage water discharge at a dam.
23. Process where light atoms combine to release massive energy.
24. What CSP plants store in substances like molten salt.

1. Less than 3% of these 90,000+ structures in the U.S. produce power.
2. Literally means "heat from the earth".
4. The electrode where hydrogen enters the fuel cell.
5. An eggbeater-style model of a vertical-axis wind turbine.
6. Known as the "Swiss Army Knife of Energy".
8. A solar-thermal method using mirrors to reflect sunlight onto a receiver.
9. STORAGE A system that acts as a giant battery by moving water between reservoirs.
12. Describes hydropower’s ability to ramp up or down quickly.
14. Technology using semiconductor materials to convert sunlight directly into electricity.
22. One of two states generating more than 50% of its electricity from wind.