In 2008 we realized that there is energy wastage. How was the situation?Well, for a typical indoor RBS site, air conditioner cooling is responsible for almost 50% of the total electricity bill to run the site. In addition, Air Conditioning has a relative high maintenance cost. To make it worst, in several areas in Indonesia there are instability electricity problem. While as we know, Air Conditioning does not operate without PLN or Genset.