For the purposes of this section, the following term shall have the following meaning:—
''Non-emitting renewable thermal infrastructure project,'' a utility-scale project that replaces natural gas distribution infrastructure with distribution infrastructure that supplies heating, or heating and cooling, from fuel sources whose combustion does not emit greenhouse gases, as defined by section 1 of chapter 21N; provided, however, that a ''non-emitting renewable thermal infrastructure project'' may include, but shall not be limited to, a networked geothermal system.