Most of electricity comes from water power plants. 大部分電力是由水力發電廠生產的。
By impeding the flow of a river, a hydroelectric dam converts kinetic energy into gravitational potential energy stored in the form of a deep lake. 水力發電廠的水壩藉由攔阻河水的流動,將動能轉變為重力位能,並以深水湖的形式儲存下來。