Invest in "batteries". And by batteries I mean an electrical energy storage device. It doesn't have to be some lead acid box. An example would be a hydrogen electrolysis / fuel cell combo.
The single greatest characteristic of fossil fuels is that they are a very transportable source of dense energy that can easily be transformed into other forms of energy using well established technologies. e.g. internal combustion engine -> kinetic energy, boilers+turbines -> electrical energy, fire -> thermal energy.
The same technologies exist for transforming electrical energy (electric motor -> kinetic energy, wire -> electrical energy, resistors -> thermal energy). The only thing that's missing is the extremely transportable and dense part.
Nail the battery and you eventually kill fossil fuels.
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