GEM is great for viewing generating stations. OpenStreetMap also has really good infrastructure data, including substations and transmission lines: https://openinframap.org/

I suspect there may be a flaw in the visualization where smaller dots are drawn with disproportionately more pixels than bigger dots. Just looking at how much green is on the map is way more than numbers I can find support for. For example, spain visually looks like more than 90% solar/wind but in reality it appears to only be about 60% [ https://www.reuters.com/business/energy/renewables-produce-a... ]

Yes, a 1MW solar plant point has about half the radius as a 1000MW hydroelectric plant point.

The green dots is rendered on top of the red as well