Great River Energy's announcement that they would build a battery to help replace a coal-fired power plant received uncritical praise from the media and renewable groups, but a closer look at the proposed battery system shows this aspect of their plan is more of a publicity stunt than source of power....
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Wind generation through June of 2019 was actually 4 percent lower than through June of 2018, according to Energy Information Administration data. This decline in output comes even though there are more turbines in operation today than there were at this time in 2018. The year-over-year decline in 2019, to date, is due to lower wind production in January, February, March, and June, compared to 2018. The decline is likely due to a variety of factors including weather, turbine degradation, and possibly curtailment of wind facilities when the grid was constrained. Weather is the most likely culprit for lower wind output year-to-date...
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