RETZBACH Biogas Plant
| Location | Germany |
| Construction Period | 1991 |
| Input | Manure, straw, other organic substrates |
| Fermenter | Two steel tanks, 100 m3 each |
| Gas utilization | Gas engine, 15 kWel |
| Specials | Two digester, gas bag, solid/liquid separation |
| Responsibility | Basic evaluation, pre-, draft- and execution planning, site management/project controlling, start-up |