Largest US energy grid operator to study too much reliance on natural gas Posted on May 1, 2018 by Terry M. Jarrett The Hill reports that Andy Ott, chief executive of PJM, said the electric grid operator will study the risks of relying too heavily on one energy source, as energy production comes increasingly from natural gas rather than from coal. http://thehill.com/policy/energy-environment/385494-largest-us-energy-grid-operator-fears-over-reliance-on-natural-gas