Energy

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Across
  1. 2. same as release or discharge
  2. 4. same as demands
  3. 6. You can find something round from this word. It is used to storage energy.
  4. 7. In the future it might be possible that roads are covered with these or windows are made of these
  5. 8. synonym=usefulness
  6. 9. _______ converts solar energy into electrical energy
  7. 10. opposite of supply. Electricity _______ is subject to substantial hourly, daily and seasonal variation
  8. 11. the act of entering into or through something
Down
  1. 1. synonym=trade, means also social exchange
  2. 3. what is for example pumped hydro? Or batteries?
  3. 5. When something is stopping and starting irregularly it is______.
  4. 12. black coal is not this kind of energy source