SolarThe mean solar energy density is about 4.5kW per square metre per day, which indicates its potential use as an energy source. Some solar developers are seeking to set up large solar PV projects..Wind EnergyPotential areas for wind areas have been mapped by TANESCO. There are several areas in the country, predominantly along the coast, with attractive wind speeds.HydroHydroelectricity is the most important indigenous source of commercial energy, with a recognised potential of 4.7 GW of installed capacity and 3.2 GW of firm capacity. Only 15% of the potential installed capacity has been developed and several projects are currently soliciting funding.Geographically, the hydro power potentials of Tanzania are located in the Rift Valley escarpments in the West, Southwest and Northeast regions of Tanzania. The planned large-scale hydropower generation sources include Ruhudji (360 MW), Rumakali (220 MW), and Stieglers Gorge (2,100 MW). The latter may have the potential to produce enough electricity to justify investments in extending the national grid, and has been under discussion for decades due to a number of environmental and social issues.GeothermalThere is a high potential for geothermal power generation in Tanzania, with temperatures of up to 255 oC (dry steam). At least 15 thermal areas with hot spring activity could be justifiable development projects. The total potential geothermal power in 50 identified sites is 650 MW. The Songwe site in Mbeya region alone has an estimated potential of 100 MW of electricity. At issue is that some of the identified sites, such as Lake Natron, are in or near reserves such as Lake Manyara and Ngorongoro. Geothermal exploitation involves changing the flows of underground water, which in some cases have led to draining of nearby lakes. While the potential Tanzania is considerable, it should be kept in mind that estimates are more than an order of magnitude less than in neighbouring Kenya.