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It's 5.5 MW.

That's not how power or energy works.

5 [W*hr/day] (Kept in energy units per interval rather than average power).

200e6 users/day who surf for maybe 4 hours/day

5 * 200e6 * 4 / 24 = 133 [MW*hr/day] (133/24 = 5.5 MW)

A typical US home uses 11 [MW*hr/y] or 0.36 [MW*hr/day].

(Convert to power draw, that's 0.015 MW.)

mean consumption of roughly 400 US homes (133 / 0.36).

The smallest US grid-tied operational nuclear power plant produces 600 MW. 133 MW very small coal power plant would 400 MW.

https://data.firefox.com/dashboard/user-activity




Your math is wrong.

  5W/user * 200e6 user * 4h/24h = 167 MW
  11 MWh/a/home = 0.00125 MW/home
  167 MW / (0.00125 MW/home) = 133 000 home




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