One measure of the efficiency of a generator or power plant that converts a fuel into heat and into electricity is the heat rate. The heat rate is the amount of energy used by an electrical generator or power plant to generate one kilowatthour (kWh) of electricity. The U.S. Energy Information Administration (EIA) expresses heat rates in British thermal units (Btu) per net kWh generated.
The Constitution specifically grants Congress its most important power â the authority to make laws. A bill, or proposed law, only becomes a law after both the House of Representatives and the Senate have approved it in the same form.
1 The powers granted to the national government and listed in Articles I, II, and III of the United States Constitution are called the delegated or enumerated powers. 2  These can be viewed as the legitimate powers of the national government. 3  Legislative power is vested in the Congress.