Mills calls for investigation of CMP solar problems Gov. Janet Mills calls for an investigation by the Public Utilities Commission in response to news of CMP's interconnection problems reported last week by the Press Herald. Share Gov. Janet Mills on Monday asked the Maine Public Utilities Commission to open an investigation into why Central Maine Power is belatedly telling solar developers that their projects are causing technical problems at substations that in some instances could require multimillion-dollar upgrades. Mills said she is especially concerned that some solar projects were already built and ready to operate, “and it is deeply regrettable that CMP apparently did not anticipate these issues at the time they entered into these interconnection agreements,” Mills wrote in a letter to PUC Chair Philip Bartlett.