Power outages in commercial buildings create enormous costs and hardships for business owners, tenants, and employees. The costs include lost productivity, lost sales, lost product, and brand damage. In some cases, outages can jeopardize life safety. For these reasons, many commercial buildings are incorporating backup power systems — some on a voluntary basis and others based on code requirements. This course explores the motivations for using backup power, relevant code and standard requirements, and the fuel options for backup power generators.