One of the pillars of the German renewable energy program is biogas. the German Energy blog has a post on a report looking at progress on this front - Biogas Monitoring Report 2013: Targets Difficult to Reach, Despite Strong Growth.
According to the 2013 Biogas Monitoring Report presented from the Federal Network Agency, 108 biogas power plants fed 413 million m³ of biogas into the German gas grids in 2012, a 50% increase compared with 2011 (77 plants; 275 million m³). However, this represents only 6.9% of the target of feeding 6 billion m3 into the German gas grids by 2020 pursuant to Section 31 Gas Access Ordinance (GasNVZ).
Compared with the target of feeding 10 billion m3 into the German natural gas grids by 2030, only 4.13% had been reached so far, the Federal Network Agency (BNetzA) said. Even if one assumed linear growth of biogas power plants, the targets would probably be missed, the agency added.