Solar energyThe average solar energy potential ranges between 5 and 7 kWh/m2/day, while the average period of sunshine varies between 7 and 10 hours per day. In 2006, the power installed in the sector of solar photovoltaic (PV) was estimated at 1,170 kWp. The current use of solar thermal energy (hot water) accounts for about 2,000 m² of absorbers. The use of solar cooking and drying is very low, but significant potential exists for the development of solar cooking, with Niger being rated the 15th most viable country in the world for further uptake of the technology by Solar Cookers International.Wind energyThe average wind speed is 5 m/s in the northern part of the country and about 2.5 m/s in the south, indicating a moderate potential for wind power utilisation in the country. Currently, about 30 small-scale installations are used for water pumping purposes.Biomass energyThe potential for energy from biomass is substantial in Niger. Household biomass use is amongst the highest in Africa, with the vast majority relying on fuel wood for heating, lighting and domestic tasks. Current forested potential amounts to 9.9 million hectares, with a further 59 Mt of animal and agricultural wastes. Biogas is only used at experimental scale, with an estimated potential of nearly 1 million hectares, and an exploited potential of 100. Currently, about 10 small-scale biodigesters (primarily of the dome type) are in operation.Geothermal energyNo specific study into the potential for geothermal power generation has been conducted for the country. However, numerous geothermal analyses have been performed due to exploration for oil, revealing the presence of geothermal basins in Niger, which, with further investigation, may prove viable for generating power.HydropowerNiger has roughly 270 MW of undeveloped hydro-electric potential, primarily in the form of the Niger river, and its potential for damming. Current projects include the 125 MW Kandadji project, 200 km upstream from Niamey, the capital, as well as two smaller dams at Gambou (122 MW) and Dyodyonga (26 MW). Small hydroelectric sites in the country have the potential to produce nearly 8 GWh per year, most notably Sirba, and Gouroub Dargol.