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The point is, if you leave your Wii on standby for a month, you use 7.2 kWh of electricity. My electricity bill at my last apartment was usually around 1000 kWh per month, and my girlfriend and I are pretty conservative with our energy use. We're talking about the smallest of fractions here, less than 1%. 20M people * 10 watts is a tiny drop in the bucket compared to what those 20M people already use.