About 70% of Tanzania's population of 50 million lives in rural areas, most without access to electricity. The Rural Energy Agency (REA) was established to accelerate the pace of rural electrification in the country and has increased rural electrification from 2% in 2007 to 11% in 2015. The scattered nature of rural settlements makes it difficult to increase access to electricity in the countryside due to the necessity of long power transmission lines. However, Tanzania has abundant solar irradiance, amounting to 200 Wp/m2. Solar power is therefore considered a cost-effective measure for rural electrification.