Conventional small and medium diesel generators use fossil fuels to generate electricity which contributes to air pollution and sound pollution. The main cons of fossil fuel-based generators:  The price of fossil fuels will continue to rise due to regulations. May need regular maintenance to keep the generators running. Fuel injection systems and other parts are more likely to break down, resulting in high costs for spare parts.

Diesel engines are mostly made from big and heavy components that can make repairs expensive. Although cheaper in the initial price, the running cost of a diesel generator can be much higher than its initial cost  of procurement.  Diesel units can be  noisy, so they’re often placed away from work areas and they have issues with wet stacking too. Hydro, wind and solar based generators  will need energies from respective sources which may not be available at all times. The generators run by nuclear energy use nuclear fuel that is radioactive. The coal based electric generators use coal which is not environment friendly and causes huge amounts of pollution.