You'll need to give me a source for those numbers. My 1,300 square foot house has a 200 ampere main breaker, so I can't draw more than about 0.024 megawatts. It would therefore take more than two thousand similar-sized houses to draw 53 megawatts—and that's only at full power draw, which I never come remotely close to.

Also it's worth mentioning that timespans don't actually matter here: monthly usage and annual usage are the same number when dealing with watts. When a source says "average annual power consumption", they likely mean that the power measurement is averaged throughout the year and that hot/cold seasons are accounted for.

If you wanted to do math involving time, you would need to use watt-hours (or kWh, MWh, etc.), for which time is a factor. For example, if you drew a constant rate of 1 kilowatt for a full day, you would have 24 hours * 1 kilowatt = 24 kilowatt-hours.