Fair enough, but using FF will be cheaper even for the “large generators”; if their base cost/kWh is about 1¢, say, the payback for a replacement of their existing generators would be under 2 years. (24 hr. X 5,000 kW X .7¢/kWh saving = $840/day. $500K/FoFu / $840/day = 596 days. Possibly only half that time depending on unit cost per FoFu.) Thereafter it’s all profit. And the costs for many far exceed 1¢. So I see replacement of existing plant constrained mainly by FoFu production capacity.