Currently, I find that the incentives to transition to new energy sources are not very strong for a normal play through of the game. My understanding of the purpose of energy transitions are only to "free up" the fuel resource for other use (i.e. stop burning coal so you can use it for steel production), with the exception of the biomass burners (not automatable). However, one doesn't really need to, especially if you overclock miners.
I suggest that the incentive to use higher-energy sources be strengthened by adding wastes to coal and fuel generators, identical to nuclear plants. The "lower tier" of energy source, the more waste it should produce per MWh.
Coal Generators should produce large quantities of "fly ash", a real world consequence of burning coal (https://en.wikipedia.org/wiki/Fly_ash).
Fuel Generators should produce medium quantities of "used motor oil" (or something similar), since the generators are internal combustion style. It wouldn't be a fluid, just an item like 'fuel' or 'crude oil'.
Nuclear Plant waste could be renamed to "spent fuel" (https://en.wikipedia.org/wiki/Spent_nuclear_fuel), and would be produced at the same rate as it is currently - which should be lower than coal and fuel.
All wastes should be recyclable, but the tech is available 1+ tier above the tier that unlocked the generator.
Fly Ash would be recycled into concrete, via an alternate recipe (should be researchable, no hard drive needed).
Used motor oil would be recycled into plastic (or 'fuel'), via an alternate recipe (should be researchable, no hard drive needed).
Spent nuclear fuel should be burnable in a new reactor, called "Fast Nuclear Plant" which would consume the spent fuel AND generate electricity while doing so. Essentially, a nuclear incinerator.
Factorio has the pollution/base attack mechanic to drive the player to clean up and upgrade their power production - which is not a mechanic I'd like to see in Satisfactory. So, there should be another way to do so. Otherwise, it seems pointless to non-megabases to have fuel and nuclear generators if you could get away with mainly coal, especially considering the higher construction costs of the fuel generators/nuclear plants.