HydropowerHydropower is the largest RE resource in Bhutan - the source for 99% of the country’s electricity generation today. It is widely abundant in terms of potential, estimated at 30,000 MW. The total hydroelectric technically exploitable capacity, based on all practicable sites for head development and assuming average flows, is estimated at 23,500 MW .Accelerating hydropower development for export is of strategic significance for Bhutan’s economy. Given the government’s limited fiscal capacity for large infrastructure projects, the strategy is to leverage public and private investments to accelerate hydropower, and generate income for further socio-economic development. Biomass Energy Today, biomass is the predominant fuel, with the largest share of the overall energy supply. Biomass includes wood, wood waste, pear, wood liquors, rail-road ties, pitch, wood sludge, municipal solid waste, agricultural waste, straw, tires, landfill gases, fish oils, and other waste materials. The entire rural population uses fuel wood as its main source of energy, while the urban and suburban population uses it for space heating during winter.Solar Energy Solar power has become an important part of rural electrification. Where the grid extension is assessed economically unfeasible, off-grid electrification has been pursued, mainly through stand-alone solar home systems. Most of them have been installed in rural households under donor-assisted grant projects, and up to 2010, 1,750 additional solar home systems were installed by the Government under the National Solar Electrification Program. So far the total installed capacity in the country is a marginal 0.239 MW. The use of solar energy for space heating and domestic hot water production has received little attention from the public and private sectors, mainly due to high cost of solar PV systems, and availability of cheap hydroelectricity, which has diverted the attention of the consumers. The solar resources in the southern and northern parts of the country were found to be 4.0 kWh/m2 and 5.0kWh/m2 per day respectively, according to a study carried out by UNEP. Wind Energy / Geothermal Energy Wind power has remained unexplored so far although some efforts have been made in the past to tap it, without any success. No study has yet been conducted into the geothermal potential of the country.