The Korean energy demand-supply policy has changed from supply-concentrated management to demand-concentrated management with low consumption and high efficiency. Given these policy changes, this study focuses on investigating the marketing strategies of public policies that are necessary to execute policy effectively and to achieve the intended effect. More specifically, this study reviews details pertaining to the four elements of energy demand management policy: the development and commercialization of core technologies for energy efficiency, energy saving business growth, innovations in energy demand management, and reasonable energy price policies. We furthermore analyze the effects of introducing an energy-efficiency certification system to both companies and consumers via an energy policy implementation. We find solutions to achieve the goals of the energy demand management policy via effective marketing of the energy-efficiency certification system. This investigation contributes to developing marketing strategies to achieve certain public policy effects. We additionally focus on how the characteristics of an energy-efficiency certification system—such as public benefits, brand trust and customer value—affect customer perception and the effect of policy implementation. According to our findings, trust in the energy-efficiency certification system and the four elements of energy policy influence firms and consumers’ realization and are effective at accomplishing the goals of the energy-efficiency policy. Energyefficiency certification help firms to invest in energy-efficient facilities; such certification also motivates reasonable energy consumption levels and the option to select highly energy-efficient products. By employing a certification system actively as a means of governmental policy and providing accurate energy-efficiency information to firms and consumers, it is possible for firms to produce highly energyefficient products and for consumers to choose efficient products. In this way, governments, firms, and consumers are able to accomplish the goals of the policy.