Tesla's roof

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Across
  1. 1. derived from the sun
  2. 4. costing a lot of money
  3. 7. what covers a roof
  4. 9. goal, aim
  5. 11. not expensive
  6. 12. the covering that forms the top of a building
  7. 13. the power from something such as electricity or oil
  8. 14. costing little money
Down
  1. 1. causing little or no damage to the environment and therefore able to continue for a long time
  2. 2. strength
  3. 3. to work with
  4. 5. capable of being replaced by natural ecological cycles
  5. 6. a person who buys goods or a service
  6. 8. to collect
  7. 10. to cause something to exist