You're not going to spend a fixed price over time. You're going to consume a fixed amount of energy and pay an increasing rate as the dollar inflates.

Ideally we'd model all relevant parameters, my main point is that presenting the cost as $2940 is misleading.

And their point was that it’s not. The price of electricity typically grows to offset inflation.

The time value of money is typically a more significant factor than inflation. If you believe that there will be massive inflation that outstrips the time value of money, then you should still feel this figure is misleading because it's too low.

I agree it's best to consider the capex/opex separately but I strongly disagree taking this approach will right-size the number. Here you're taking lifetime opex in nominal dollars but still devaluing it based on inflation anyways, which will not give you a meaningful result.