Diesel generators that are used by data centers to provide back-up power are often not exercised in accordance with the manufacturer's recommendations. This can lead to both generator problems and soot coated diesel particulate filters when so equipped. Johnson Matthey's innovative automatically regenerating ActivDPF system combines a load bank with their passive diesel particulate filter to provide facility operators and engineers peace of mind that their emergency generators are able to deliver clean energy whenever needed. The ActivDPF system automatically regenerates the diesel particulate filter while simultaneously exercising the engine. The passive diesel particulate filter traps up to 99% of harmful particulate matter from diesel exhaust with a catalyst that reduces carbon monoxide and hydrocarbons.