Solar energy Average horizontal irradiation is 5.5 kWh/ m2/day. Rwanda is also home to the largest single solar installation in Africa - the Kigali Solair plant- which generates 250 kW and feeds into the national electricity grid. The plant was funded by the German municipal power company Stadtwerke Mainz, and installed by Juwi in 2008.Wind energy The Ministry of Energy recently commissioned a feasibility study to determine the wind power capacity of Rwanda. This National Wind Atlas is being developed with the help of the Belgian government. Wind energy is currently exploited only in decentralised off-grid applications.Biomass energy An estimated 2.3 million tons of wood fuel are consumed in the country annually. The Rwanda Energy Management Authority (REMA) estimates that Rwanda has a deficit of 4 million cubic metres of wood fuel, due to extensive deforestation, and over-reliance on biomass for heating and light in rural areas. Also, as the majority of rural biomass is foraged, market mechanisms to improve the quality of fuel will be slow to take effect. Fuel-wood caps are to be imposed in several districts of the country to combat this. Aforestation measures, accompanied by a concurrent reduction in biomass consumption, aim to increase the forested area of the country to 23.5% by 2012. The country also has significant peat reserves, estimated at 155 million tonnes in 2008. GIZ are supporting the development of the National Biogas Development Program, which aims to install upwards of 15,000 biogas digesters for schools and farming households, to provide biogas for cooking and lighting, and reduce dependence on fuel-wood. Plans have also been put in place to increase national annual biodiesel production to 16 million litres, and install an additional 1 MW of biogas-fired power capacity.Geothermal energy Potential exists for between 170 – 320 MW of geothermal power generation, due to the country's proximity to the geothermal resource of the Great Rift Valley. Studies have indicated thermal waters with temperatures of up to 150ºC.Hydropower Hydropower potential in the country is estimated to be 500 MW, with only 72 MW having been exploited.The country has substantial hydroelectric resources, as well as natural gas deposits under Lake Kivu, which could make Rwanda self-sufficient in electricity, or even a net exporter. But the development of natural gas power plants, or new dam construction, requires both time and investment. Nevertheless, the Ministry of Infrastructure is financing 11 hydropower plants with installed capacities from 100 kW to 9.5 MW. GIZ (Deutsche Gesellschaft für Internationale Zusammenarbeit, formerly GTZ) are also providing support to MININFRA for the promotion of SMEs in the small-hydro sector. Three companies have currently commissioned small-hydro projects, with a combined capacity of 755 kW, with a further 3.6 MW under consideration from 10 other projects. By 2015, the Government hopes to have promoted an additional 45 MW of small-hydro capacity in the country.