I mean, we could always ignore the final reactor because quite frankly the entire point was to supply so much power that nobody would ever have to worry about it ever again. It being at the very end of progression also means that most people never even get this far.
Still, we might be able to find some middle ground. For example, how much EU is one lump of coal worth, assuming ideal mid-game power generation? In NTM that would be 400kHE at a rate of 4kHE/s using a standard firebox, a boiler and a turbine with 100% efficiency.