From Captain of Industry Wiki
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Mechanical Power is a type of energy generated by High-Pressure Turbine [II] and Low-Pressure Turbine [II] that can be turned into electricity by a Power Generator [II] or stored by a Flywheel.
It is transferred by shaft input/output and is NOT dependant on port polarity, which means it is possible to connect the energy receiving Power Generator's output to the input of a Turbine, as long as the "shaft" faces in the same direction.
Shaft has no mediator therefore it is necessary to place buildings sharing the same "shaft" direclty next to each other - connecting their "shaft" ports.
Below are all the recipes, which contain this item. Note, that some of them may be locked behind Research, and not immediately available in your game.