Across six regions, according to the report, coal provided 55 percent
of daily incremental
generation, and the study concludes that at least for PJM Interconnection (which manages the
electricity grid across 12 Midwest and Mid-Atlantic states as well as DC), «coal provided the
most resilient
form of generation, due to available reserve capacity and on - site fuel availability, far exceeding all
other sources» without which the region «would have experienced shortfalls leading to interconnect - wide blackouts.»