the unconsumed excess energy that your solar panels produce during the day can be stored and used to power your house at night. The same principle applies to the scheme known as net metering ...

The cell keeps generating electricity, even on cloudy days, until the sun goes down at night. To see solar power in action, check out This Solar House.

These surfaces then release the heat at night to keep the building warm. Similarly, absorbent plates on a roof can heat liquid in tubes that supply a house with hot water. Solar energy is lauded ...