Coal (Pros: Cheap, abundant; Cons: Most polluting, finite)
Biomass (Pros: Multiple applications, much potential; Cons: Air pollution, politics, overharvest concerns)
Wind (Pros: No pollution, very efficient; Cons: Intermittent, unattractive, threat to birds/bats)
Hydroelectric (Pros: Clean and renewable; Cons: Destroys habitats, captures sediments, population displacement)
Solar (Pros: no fuel, quiet and safe, good in rural settings, no pollution; Cons: Up-front costs, storage, some locations not ideal)