![Figure 1 Shares of Total U.S. Net Generation by Fuel: 2005 vs. 2016](https://www.infrastructureusa.org/wp-content/uploads/2017/07/AG-figure-1.jpg)
Fundamental market forces — the addition of highly efficient new gas-fired resources, low natural gas prices, and flat demand for electricity — are primarily responsible for altering the profitability of many older merchant generating assets in the parts of the country with wholesale competitive markets administered by Regional Transmission Organizations (RTOs). As a result, some of these resources (mostly coal- and natural gas-fired generating units, but also many oil-fired power plants and a handful of nuclear power plants) have retired from the system or announced that they will do so at a future date.
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