In 2014, more than 10% of the electricity used in the grid covering most of Texas came from wind generation, according to the grid’s operator, the Electric Reliability Council of Texas (ERCOT). Wind’s share of the ERCOT generation mix grew from 6.2% in 2009 to 10.6% in 2014, as total electricity generation increased over the same period by 11.3%. The growth in wind generation is a result of new wind plants coming online and grid expansions, which have allowed more wind power to flow through the system to consumers.
Wind generation in ERCOT nearly doubled from 18.8 million megawatt-hours (MWh) in 2009 to 36.1 million MWh in 2014. Wind capacity has also grown substantially over the past six years (and even more so in the years before then). However, wind generation grew at a faster pace, partly because transmission constraints, which previously prevented wind generators from operating at their maximum capability, were gradually removed through a state-directed transmission expansion program. As these transmission constraints were removed, more production from wind plants, largely concentrated in the northwestern part of the state, could reach the state’s population centers. The result has been a faster increase in wind generation than in wind capacity from 2009 to 2014.
Wind’s contribution to ERCOT generation isn’t evenly distributed throughout the year. In Texas, peak wind season occurs during the spring (March to June) before significantly dropping off during the summer (July to September). Based on data for the past six years, the four months from March through June account for on average about 40% of annual wind generation in ERCOT. The last graph demonstrates a fairly consistent seasonal pattern from year to year, despite the difference in actual volumes of generation.
U.S. Energy Information Administration
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