I'm posting this just to compare power rates not to win an internet fight. My power bill is tiered, and at the lowest tier I'm paying double your rates ($0.28 / kWh.) Once I add a rack like that on I'd probably be bumping up to the next tier which will increase my power to something like 2.5-3x that rate. Because of the tiered system even my non-server load will be metered at a higher cost. It's really not worth it here to run servers at home if I'm not being highly power conscious.
Meanwhile in Germany, the tiers are the other way around: base fees and meter costs increase effective rate at the low-consumption end, while you end up with only (even discounted, somewhat, usually!) per-kWh rates dominating at high consumption.
Industrial loads also get assessed for peak power sustained for like a few minutes at least once a year, to reflect capex/depreciation of sufficiently-overprovisioned distribution transformers and other related last-mile power-handling capacity.
This is relatively negligible if you average over 10% of your peak draw, though. And even beyond, recent energy prices Matt have shifted the balance spot to even more-peaky consumption.
