In Chicago, there are quite a bit of gas power plants but around Illinois and its neighboring states, there are also quite a bit of nuclear power plants with a higher capacity than the gas power plants in Chicago.
Map of Chicagoland (the green markers are gas and the bluish grayish markers are nuclear)
In Toronto, there seem to be quite a bit of wind power plants, however there are a few nuclear power plants with higher capacities.
Map of Toronto (the black markers are wind and the bluish grayish markers are nuclear)
In Mexico, there seems to be quite a bit of biomass and hydro power plants.
Map of Mexico (the orange markers are biomass and the yellow-green markers are hydro)
In South America, especially in Brazil, there seems to be an abundance of hydro power plants. There are also many hydro power plants in Europe as well.
Map of South America with all the hydro power plants
The power plant with the maximum capacity is located in China and is a hydro power plant.
The power plant with the maximum capacity (the popup gives the details about the power plant)
In South Africa, there is a bunch of coal power plants.
Map of South Africa (the light blue markers are coal)
There are only 2 power plants located in Antarctica: one being an oil power plant and the other being a wind power plant.
Map of Antarctica with the only 2 power plants in the continent
Utilizing the sliders, the biggest power plants seem to be located in Asia and are both hydro.
Map of Asia (the two power plants with the greatest maximum capacities are in China)