A typical 250kVA diesel generator would emit 960g of CO2 per kWh, as well as 932.5g of NOx/HC, and 327.5g of CO per hour of operation; the HPU emits zero pollutants. The only emission is pure water and the unit emits far less noise pollution. Diesel generators are now actively discouraged or banned in many applications due to unacceptable emissions. The noise and pollution associated with diesel generators are particularly unwelcome in welfare and populated settings. Key differentiators from diesel generators include: - HPUs do not emit any of the pollutants that diesel generators release. The sole exhaust is pure water, which can be put to use by customers for other purposes, which is normally a benefit at remote sites. - The relatively quiet operations and lack of air pollution mean that HPUs are much more appropriate for use in built up areas, which may assist customers in obtaining necessary permissions for construction works. - HPUs operate more efficiently than diesel generators, even more so when CHP benefits are taken into account. Comparatively, less fuel is used to achieve the required power output, due to efficiency, reduced wastage and more sophisticated management. - Over the life of an HPU it is expected to avoid emissions of 1,800 tonnes of CO2 when compared to a diesel generator. A HPU is far more than a direct replacement for a diesel generator.