Energy has become one of the benchmarks of the development of a country and even become a political economic power including Indonesia. Along with the growth of population and economy, it is undeniable that the energy needs of Indonesia also continues to increase rapidly. Most of the source of this energy needs are from non-renewable/ fossil energy such as petroleum, natural gas and coal, and the utilization of it will produce greenhouse gas emissions (GHG) that contribute to global warming and climate change. To improve national energy security in the long term and contribute to global efforts to put a half to climate change, energy conservation and energy diversification through the development of sustainable renewable energy is a necessity.

WWF's vision in the energy sector is to encourage the achievement of 100% Renewable Energy in 2050 globally. For Indonesia, this time is an important period for the transition and transformation of the energy sector towards the development of more environmentally friendly and sustainable. The potential for renewable energy in Indonesia is very large and has not been optimally used. One of these is geothermal energy. Through the program "Ring of Fire", WWF supports the sustainable development of geothermal energy.

Geothermal development in Indonesia is relatively slow with a dynamics and complex problems. One of the concern is the location of the geothermal potential that mostly located in forest area where the biodiversity needs to be protected, providing ecosystem services such as water sources, has the function as the guardian to balance the climate as well as a source of economic income for the community and countries. Geothermal and forest is a natural resource that has great benets for human survival. Geothermal development in forest areas should always pay attention to sustainability of ecosystem aspects.

"Sustainability Guidelines for Geothermal Development" is an idea of WWF-Indonesia's efforts to synergize the development of sustainable renewable energy and support the conservation of forests in Indonesia.

This guide identities essential criteria and indicators that need to be applied in maintaining the sustainability of geothermal utilization in the forest by paying attention to the stability of forest, the sustainability of the ecological function of forest ecosystems and the sustainability of socio-economic and cultural functions of the forest ecosystem. The preparation of this guide has been through a series of discussion and consultation process

with stakeholders. I hope this guidelines can serve as a reference for the government, geothermal developers, academia and also the community.