What is the source of power?
sunlight
What is the source of power?
gas
What is the source of power?
atom
What is the source of power?
atom
What is the source of power?
water
What is the source of power?
sunlight
What is the source of power?
coal
What is the source of power?
heat
What is the source of power?
wood
What is the source of power?
gas
What is the source of power?
oil
What is the source of power?
wood
What is the source of power?
wind
What is the source of power?
heat
What is the source of power?
wind
What is the source of power?
coal
What is the source of power?
water
What is the source of power?
oil