Versions of Oregon Statutes 308.521 - Property of cooperative providing steam or hot water heat by combustion of biomass exempt on LawServer 2023 Oregon Statutes 308.521 – Property of cooperative providing steam or hot water heat by combustion of biomass exempt 2021 Oregon Statutes 308.521 – Property of cooperative providing steam or hot water heat by combustion of biomass exempt 2019 Oregon Statutes 308.521 – Property of cooperative providing steam or hot water heat by combustion of biomass exempt