The sales and use tax does not apply to: a sale of electricity, steam, or artificial or natural gas for use in residential condominiums; a sale of electricity, steam, or artificial or natural gas that is delivered under a residential or domestic rate schedule on file with the Public Service Commission; a sale of coal, firewood, heating oil, or propane gas or similar liquefied gas for use in residential property that contains not more than 4 units, cooperative housing, condominiums, or other similar residential living arrangements; a sale of electricity through 3 or more bulk meters for use in a nonprofit planned retirement community of more than 2,000 housing cooperative or condominium units if: ownership of units is restricted by age; any unit is served by an individual meter; and on or before July 1, 1979, at least 3 bulk meters served the community; or a sale of electricity generated by solar energy equipment or residential wind energy equipment, as defined under § 11–230 of this subtitle, for use in residential property owned by an eligible customer–generator under § 7–306 of the Public Utilities Article. The sales and use tax does not apply to a sale of wood, wood bark or residue, or refuse-derived fuel used for heating purposes.