Energy efficient strategies for JSX building in Jakarta, Indonesia

Regular escalation of the state electricity price gives an impact to the increase of operational cost of any high-rise building in Indonesia. To be a rental office, the twin 31-floor buildings of Jakarta Stock Exchange (JSX) or Bursa Effect Jakarta (BEJ - in Indonesian terms) had no exception. The twin buildings were suffered from the impact of the state electricity price escalation. To reduce the bill, the building manager had to reduce the buildings energy consumption, and to consider tenants necessities for indoor comfort at the same time. To do this, a number of strategies had been employed in the buildings. However, one of the most successful strategies was that by setting chilled water temperature of the central air-conditioned system, 1oC higher. By employing this strategy, building electricity bill had been reduced into some extent, whilst at the same time indoor thermal conditions had been maintained comfortable. This paper discusses the above matter and shows the way the buildings reduce their energy consumption without sacrificing occupants' thermal comfort.