Solar energyAnnual solar insolation shows good prospects for photovoltaic and solar thermal systems. Though no official renewable resource assessment has been carried out, estimates suggest monthly average daily solar radiation on horizontal surfaces between 4.0 and 6.0 kWh/m2/day. As of 2009, installed solar capacity amounted to approximately 100 kW.Wind energyThere is little or no data available on wind speeds in Liberia, but it is situated in a low wind region, and except for mountainous and coastal areas, wind resources are expected to be relatively insignificant. Observations along the coastal regions have indicated good prospects for wind power. Biomass energyThe country is endowed with considerable biomass resources. These include rubber, oil palm, pine and other trees, cassava, sugar-cane, elephant grass, coconuts, and residues from rice and wheat production. An NREL assessment in 2008 placed the potential contribution to electricity generation from crop residues at 6,000 GWh/year, and forest residues at over 15,000 GWh/year. The Liberia Energy Assistance Program (LEAP - funded by the USAID), 2008 biomass resource assessment, revealed a variety of resources - more than enough to meet the annual electricity consumption of 297 GWh and oil consumption of 189.2 ktoe. The study further estimates that of the total cropland in Liberia, only 6% is currently cultivated, with remaining cropland of some three million hectares. While the contribution of food crop residues, animal manure and municipal solid waste is small in comparison to other resources within the country, they could play a valuable role in stand-alone electricity applications and for households in remote rural areas. The government is planning to install 7 MW of biomass-fired generation capacity in the country, through two projects. Geothermal energyThe geothermal potential of Liberia has not yet been analysed. Geological activity is thought to be low. HydropowerLiberia has an economic hydro-electric potential of around 1,000 MW. Liberia has six major rivers, which drain over 60% of the country’s water -including the Mano, Saint Paul, Lofa, Saint John, Cestos, and Cavalla Rivers. Short coastal waterways drain about 3% of the country’s water. This intensive drainage pattern indicates considerable potential for hydroelectric power in Liberia. Hydropower resources in Liberia have been seen as relatively costly to develop compared to other African sources, due to the highly seasonal flow of water, and the relatively flat terrain, which hinders the development of reservoirs, providing the need for significant back-up generation.