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.
This system would establish a strong central government, while insuring a balance of power. Governmental power and functions in the United States rest in three branches of government: the legislative, judicial, and executive. Article 1 of the Constitution defines the legislative branch and vests power to legislate in the Congress of the United States.