A gallon of diesel, which you can easily carry, has about 40 kWh of (admittedly thermal) energy. You can pour it into a tank in a few seconds. Edit: if it take

A gallon of diesel, which you can easily carry, has about 40 kWh of (admittedly thermal) energy. You can pour it into a tank in a few seconds. Edit: if it takes 10 seconds per gallon, that's 14.4 megawatts. Quite a lot. For instance, this massive wind turbine is rated 14 MW: https://www.siemensgamesa.com/products-and-services/offshore/wind-turbine-sg-14-222-dd https://www.siemensgamesa.com/products-and-services/offshore...