and then there was light

This week, Simon had to do a project for school in which he had to construct a building. He got to choose the type of building and the materials.

He chose something he named the "eco center" because he'd been reading about "green" buildings in a magazine. His building has a green roof with a rain garden and a compost pile, a water barrel, and no air conditioning. 

Simon: The building also has no electricity.

Me: Really? No lights, or anything?

Simon: No, it has lights.

Me: How are they powered? Don't they need electricity?

Simon: No, they don't need electricity. They use solar power.