 The partial replacement of fossil fuels with biomass provides an alternative to producing cleaner and more sustainable energy and fuels. Conventional shale oil production infrastructure can potentially be used in coparallysis with biomass to reduce the use of oil shale and decrease its environmental impact. The addition of biomass and the use of alternative atmospheres can improve pyrolysis through increased fuel decomposition and a lower share of residual mass from 74.4 wt% for oil shale to 58 to 70 wt% for oil shale and biomass blends. This article was authored by Alejandra Lyon-Siren and Alarconist.