Using two types of fuels (e.g., electricity and natural gas) to perform work.

In the case of combined electric and natural gas pumping facilities, several types of configurations are possible:

• • One pump connected to a gas engine and an electric motor using a combination drive;

• • A natural gas engine and a electric motor connected to individual pumps but drawing from the same sump or water source; or

• • One engine with both diesel and natural gas flowing into the same engine.[1]

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