Very good question. First they've wanted to get control of the biomass generating business for a long time and now they have the chance to do it and meet the renewables portfolio standard the state has in place. NG is not renewable. Secondly PSNH has the cash to build the plant themselves without assembling all the investors to partner with and I think PSNH feels they could build the plant cheaper by themselves.
If NG is such a deal, bearspread, why build a biomass plant in Berlin in the first place?