This is the deepest rabbit-hole in trading - much more so than interest rates IMO. Fuels, weather, transmission, generating unit availability, ISOs and the Incremental/Decremental Markets, bilateral OTC forwards and financially cleared forwards, ICAP Chapel Hill showing you one thing and Amerex Houston showing you something else entirely, arguing with ICE in Houston over settlement marks, etc. etc.
Complex, multi-dimensional, not easily summarized. Resists modeling.
Don't plan on buying a couple books and assuming you are 'informed'.