If power generation becomes so cheap that it can’t sustain the company then don’t rely on that for revenue.

I’m not aware of anywhere power generation is that cheap yet. That may be a problem for the future when commercial fusion is viable, but thats likely a lifetime away.

I’d rather pay a flat rate for the infrastructure and operating costs than a fluctuating generation charge.

I think everyone would, but the cost for generation is always fluctuating because the variation in the market for the fuels that generate electricity, supply, and demand of electricity on the market. If its a flat rate, and that rate is below the cost of generating the electricity, who pays?