Besides the MISO request a few posts up, I think it was Barrons or Reuters that just did an article. I also saw a few articles which try to shift blame to aging infrastructure, but there was also comment about the push away from coal/gas to wind/solar being problematic (something we ALSO just saw last week when the ERCOT tables showed the Texas wind equipment only operating at a 17% efficiency/capacity compared to capabilities).
It was just within the past few days, so Google should not have buried it too deep yet...try as they might.