The use of biomass for electricity generation is regarded by the IPCC, the Dutch government, and the European Union as a form of renewable energy, whereby biogenic (short-cycle) CO2 is released that was previously absorbed and stored by plants. Bioenergy plays a role in virtually all IPCC scenarios aimed at limiting global temperature increase to 1.5-2°C by the end of the 21st century.
Biomass is also a renewable source: it will not run out, unlike fossil fuels. It is an unending cycle.