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A Caterpillar bio-gas engine was fitted to Long Reach Sewage Works, operated by Thames Water Utilities. This is a V16 engine running at 1500 rpm, on biogas which is typically 60 % methane. Output about 1150 kWe electrical and 1.4 MW thermal energy which heats the digesters to 37 deg C . Electrical efficiency is about 38% HHV, thermal efficiency. Life cycle maintenance costs about 0.9 /kWh. Caterpillar makes about 50 units per day of this basic engine in either gas or diesel (1.8MW) format at its US factory in Lafayette Indiana equivalent to some 23 GWe of capacity per annum. The fully installed cost of this kind of plant, ie the engine, heat exchangers, generator, enclosure, silencer, cooling system, controls, gas supply, commissioning is around £400/kWe. Further info – Claverton Contact Form
See also http://tx1.fcomet.com/~claverto/cms/for-sale-66mwe-chp-station.html if you want to buy a gas engined power station,