Ask HN: How much electricity does a WiFi router consume?

Prices of the electricity in the EU recently became sky high, and people should save as much kWh as possible.

I could not find any related and trustable calculation about how much electricity consumes a Wifi router. Especially I am curious about the difference between the idle mode and when I downloading with full bandwith.

I believe there is no significant difference (and it doesn´t even matter at all, while freezers and heatings are on), but it would be nice to know.