Because they automatically respond to temperature changes, thermostats play a key role in weather-related changes in energy demand.
Texas has added coal- and natural gas-fired capacity since 2011; however, the largest share of capacity growth has been from wind generators, mostly located in western Texas.
Several large, new solar thermal power plants are expected to begin commercial operation by the end of 2013, more than doubling the solar thermal generating capacity in the United States.
The mix of fuels used to generate electricity has changed in the past few years as coal has lost some of its share of the generation market to non-hydroelectric renewables.
Waste fuels are generally used where they are created because they are readily available to use for manufacturing heat and power needs.
New-vehicle fuel economy has more than doubled since the 1970s. Moreover, new-vehicle fuel economy is projected to continue to increase by more than 50% by 2040.
One of the biggest developments in residential solar over the past few years has been the significant growth of systems not owned by homeowners.