(en) PJM Interconnection PJM Interconnection Wikipedia. http://en.wikipedia.org/wiki/PJM_Interconnection (en) PJM Interconnection http://en.wikipedia.org/wiki/PJM_Interconnection PJM Interconnection http://en.wikipedia.org/wiki/PJM_Interconnection (en) PJM Interconnection PJM Interconnection PJM PJM Interconnection PJM Interconnection PJM Interconnection PJM Interconnection PJM Interconnection PJM grid