It's too bad about nuclear power.
From wikipedia energy density:
Coal, anthracite... 26–33 MJ/kg
Natural gas........ 53.6 MJ/kg
Diesel fuel........ 45.6 MJ/kg
Plutonium-239...... 83,610,000 MJ/kg
Antimatter......... 89,875,517,874 MJ/kg
or:
In light-water reactors, 1 kg of natural uranium - following a corresponding enrichment and used for power generation - is equivalent to the energy content of nearly 10,000 kg of mineral oil or 14,000 kg of coal.
https://en.wikipedia.org/wiki/Energy_density#Fission_reactor...