Indonesia’s daily peak electricity demand is increasing rapidly – 6% annually from 2008-2013 – and is projected to double in the next ten years. This alone will require the additional generation of sixty 500-MW power plants or equivalent by 2025. Adoption of ambitious energy efficiency policies today could significantly reduce future peak electricity demand and help achieve the national target of 23% renewable energy by 2025. This memo presents recent findings and potential strategies to ensure sustainable, reliable and affordable supply of energy in Indonesia.