U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
Electricity Monthly Update
With Data for November 2015 | Release Date: Jan. 26, 2015 | Next Release Date: Feb. 26, 2016
Highlights: November 2015
- Net electricity generation decreased 5.2% compared to November 2014 as the country experienced a very warm November 2015, leading to a decreased demand for electricity generation used for residential heating.
- Electricity system daily peak demand remained well on the low end of the annual range for almost every region as above-average temperatures caused November to resemble more of a mild shoulder month than the beginning of winter.
- Electricity retail sales volumes declined by a significant amount in nearly every state in the eastern half of the country where abnormally mild weather lowered heating demand.
|November 2015||% Change from November 2014|
|Total Net Generation
|Residential Retail Price
|Natural Gas Price, Henry Hub
|Natural Gas Consumption
Installed wind generator tower heights and output are growingSource: Form EIA-860, The Annual Electric Generator Report
The average height of a typical wind turbine has increased almost 70 feet since 2001. In general, wind speeds are greater and more consistent at greater heights as a result of reduced effects of surface:air friction and ground-level interferences.
The wind industry is taking advantage of those better wind conditions by using taller towers. The average hub height has increased from 196 feet in 2001 to 265 feet in 2014. During this time, average turbine capacity factors have grown from 29% in 2001 to 34% in 2014.Source: Form EIA-860, The Annual Electric Generator Report
Improved average output per capacity depends on factors in addition to tower height, including improvements in siting practices and generator design. One important design attribute is unit size. Taller towers are able to accommodate the longer blade lengths of larger wind turbines. The average wind turbine capacity has doubled over the past 13 years, moving from approximately 1 megawatt (MW) in 2001 to 2 MW in 2014.