Biomass small scale heating systems (up to 100 kW) had an average market growth of 25% between 2001 and 2009 (the period for which all types of new small scale biomass heating systems are covered). However, the sector experienced quite strong fluctuations and discontinuities. For decentralized, small scale wood chips and pellets systems, achieving the NREAP-target would require annual market growth of 11% and 12%, respectively (2008–2020). Thus, on average the annual market growth rate would be less in the period up to 2020 than the recent historical rate.