The provisions of this chapter do not apply with respect to:
(1) Equipment necessary to process biogas from a landfill into marketable coproducts, including but not limited to biogas conditioning, compression, and electrical generation equipment, or to services rendered in respect to installing, constructing, repairing, cleaning, altering, or improving equipment necessary to process biogas from a landfill into marketable coproducts; and
(2) The use of anaerobic digesters, tangible personal property that becomes an ingredient or component of anaerobic digesters, or the use of services rendered in respect to installing, repairing, cleaning, altering, or improving eligible tangible personal property by an eligible person establishing or operating an anaerobic digester, as defined in RCW 82.08.900.