Timeline
1903	Charles Curtis, steam turbine generator.
1903	William Le Roy Emmet, steam turbine.
1920s	Charles L. Edgar designs the first high-pressure steam plant.
1927	Single-core paper-insulated cables designed to carry 132,000 volts are laid in the United States.
1932	Construction begins on Hoover Dam.
1933	Tennessee Valley Authority is established.
1934	First coiled-coil electric light bulb is introduced; increases the amount of light radiated.
1935	President Franklin Delano Roosevelt issues executive order to create the Rural Electrification Administration (REA), which formed cooperatives that brought electricity to millions of rural Americans.
1942	Grand Coulee Dam on the Columbia River is completed.
1942	There were 800 rural electric cooperatives with 350,000 miles of lines.