By attention to importance of energy saving and consuming management
of limit sources through the world and significance of envirnoment preservation today. We can see a big turnning to cleaner energy sources compare with last decade particularly in industrial sectors and generating electricity.
Freindly look at natural gas and other flamable fossil gas sources to generate electricity led most engine builders to reserch about gas fueled reciprocating engines that caused competition between supplier to invent engines with highest efficiency and lowest possible cost.
Result of such competition is being seen in market now under names of GE Jenbacher, MTU, MAN, Caterpillar and some few more.