B1
the power that comes from electricity, gas, etc.
Dictionary examples:
My dad saves energy by using his treadmill to power the TV. (0.0)
Our school's new energy-saving plan: students pedal bikes to power the computers. (0.0)
Our hamster generates enough energy on his wheel to charge my phone. (0.0)
It is important for us to save energy. (17.7)
We mustn't waste energy. (31.3)
nuclear/wind energy (33.8)
energy conservation/efficiency (39.6)