For the last five years, the Sierra Club has been in a healthy discussion at ERCOT (Electric Reliable Council of Texas) and the Public Utility Commission of Texas over how to calculate the value of wind energy during peak demand. Opponents of wind still use an antiquated yet lingering criticism that it tends to generate electricity mostly at night and not when Texas needs it the most – on hot summer afternoons. The state’s grid operator just assumed all wind generation had the same value at peak. Thanks in part to our efforts this isn’t the case anymore.