According to international standards, your wifi antennas should have a maximum of 0.1/0.2W power (up to 4W for some specific 5Ghz frequencies). Wifi router hard

According to international standards, your wifi antennas should have a maximum of 0.1/0.2W power (up to 4W for some specific 5Ghz frequencies). Wifi router hardware is really basic, you need something as powerful as a computer from the late 90s... which on todays hardware runs on a few watts. Something like a rpi is really beefy for a home router. So 100W may not be a big deal if you have an abundance of electricity around. But on the order of energy you can produce yourself, it's quite a lot.