Korean government set the goal of 5.6% to use renewable energy in electricity generation by 2011 compared with the current use of 0.13%. To achieve this goal, an innovative plan for market competitiveness would be required in addition to the feed-in-tariff [FIT] which is carried out at present in Korea. As a countermeasure, Ministry of Commerce, Industry and Energy [MOCIE] has taken it into consideration to introduce a Renewable Portfolio Standard [RPS] that is a purchase obligation program as an alternative plan to the FIT. Furthermore, the active renewable energy market may result from and also reversely result in the aid of North Korea with renewable energy. In this paper, we review The RPS in several country cases. Plans, systems, markets and institutionalization for solving efficiency in the area of renewable energy are discussed.