Commercial power rates are usually based on peak load, that is, you pay a higher overall rate as your peak demand increases. This highly incourages commercial costomers to manage (lower) their peak load. If you own a plant or factory you can run different equipment at different times in a scheme to lower your peak. This discourages spikes in demand and is very much in keeping with free market principles.
Likewise, we should value supply (the rate we pay the supplier) based on the reliability of the supply. Aply that very valid market principle, which goes hand and hand with that above and renewable energy as we know it is just simply folly.