As an electrical engineer, specialized in power system, I must say you know not what you request.
It may be cheaper to build a nuclear power plant instead. Sadly, I'm only slightly kidding.
The NEW right of way is only about 35ish miles. They MAY bury only a portion of this. The remainder 3/4 of the state will transit along existing right of ways. It will not be buried.
The big problem, at least for Eastern Mass is the pipe line chock point in RI. In 2004 or 5 I don't remember I got in to a huge pissing match with ISO NE who wanted my 800 MW on line which I couldn't give them because Algonquin blew up a compressor house up in RI.