Renew, reduce or become more efficient? The climate contribution of biomass co-combustion in a coal-fired power plant

- Coal mining is more energy and CO2 efficient than biomass production.
- Co-combustion of 60% biomass with coal doubles mass transport compared to 100% coal.
- Low co-combustion levels reduce GHG emissions, but the margins are small.
- Total supply chain efficiency is the highest for the coal reference at 41.2%.

Within this paper, biomass supply chains, with different shares of biomass co-combustion in coal fired power plants, are analysed on energy efficiency, energy consumption, renewable energy production, and greenhouse gas (GHG) emissions and compared with the performance of a 100% coal supply chain scenario, for a Dutch situation. The 60% biomass co-combustion supply chain scenarios show possibilities to reduce emissions up to 48%. The low co-combustion levels are effective to reduce GHG emissions, but the margins are small. Currently co-combustion of pellets is the norm. Co-combustion of combined torrefaction and pelleting (TOP) shows the best results, but is also the most speculative.The indicators from the renewable energy directive cannot be aligned. When biomass is regarded as scarce, co-combustion of small shares or no co-combustion is the best option from an energy perspective. When biomass is regarded as abundant, co-combustion of large shares is the best option from a GHG reduction perspective.