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Companies need power to be continuously supplied to be able to operate. As a long-term blackout in which emergency generators fail leads to mission critical systems being shutdown, we have to keep generators available at all times. However, building owners face considerable difficulties in installing redundant generators in term of cost, installation space, and local regulations. Without redundant generators we can neither replace nor overhaul generators in buildings that house mission critical systems. Mobile generators, which combine both mobility and large capacity, allow generators to be replaced or maintained in buildings with no back-up generator. We at NTT Facilities present solutions for failed generators: the use of a mobile engine generator. These generators are truck-mounted ones with a large capacity. They are not only used as a backup power during emergencies, but are also used as backup power for when the engine generators are being overhauled or replaced. We use reliability models and case studies to show how mobile engine generators ensure business continuity.