Manufacturers are based in many countries in the world.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
If it is Engine it is almost throughout the world. The most may be only for statisticians. But hint is - it must be in the countries where grid power is not very reliable, and the lifestyle or industry demand the power availability.
If it is Turbine - then you have limitation. The only turbine that can be fired by the diesel is the Gas Turbine, and there you are limited to only a few countries.
Now Which one you mean?
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches