Several aspects relate to the price of a 400kW diesel generator. A 400kW diesel generator implies that its size is bigger as compared to others. It is costlier than the smaller ones. A generator brand is also an important factor to consider. Well known brands that have reliable engines and quality parts are more expensive. When advanced features are included, the cost of the diesel generator increases. Such features include automatic voltage regulation, overload protection, and sophisticated control features. Value of competition in the market, and the costs of the diesel/container, fuel system, electric parts and others also add to the cost. While purchasing a 400kW generator, first check the different providers and their offered pricing, then analyze if the required energy and additional upkeep and operating expenditures are worth it.