There is no plants in illinois that has usage of geothermal energy at all in Illinois.
Coal and Nuclear are the main energy sources in Illinois.
When comparing 2000 and 2018 data, Illinois did not have wind and solar energy in 2000(renewable energy) but had it in 2018 data. People started to use more wind and solar a decade after 2000.
The use of coal has significantly decreased from year 2000 to 2018 .
The use of natural gas has significantly increased from year 2000 to 2018.
There was no solar plants in Illinois in year 2000
There was only one solar plant in Illinois in year 2010 (Exelon solar chicago) and this increased to a total of 4 plants in year 2018.
Alaska,West Virginia, North Dakota are few states that has no solar power plants in all three years(2000,2010,2018)