Kigali's electricity supply was, until the early 2000s, generated almost entirely from hydroelectric sources; power stations on Lakes Burera and Ruhondo provided 90 per cent of Rwanda's electricity. A combination of below average rainfall and human activity, including the draining of the Rugezi wetlands for cultivation and grazing, caused the two lakes' water levels to fall from 1990 onwards; by 2004 levels were reduced by 50 per cent, leading to a sharp drop in output from the power stations. Coupled with this, demand had been increasing since the 1980s as the economy grew, particularly in Kigali. In 2003–04, the national electricity company was forced to reduce output from the power stations, necessitating widespread loadshedding. As an emergency measure, the government installed diesel generators north of the city; by 2006 these were providing 56 per cent of the country's electricity, but were very costly. Power outages remained a frequent occurrence in the late 2010s. This prompted the government and national supplier Rwanda Energy Group to invest in a programme of new peat-fired, hydroelectric, and methane power stations across Rwanda as well as the construction and repair of power lines. As of 2018, 82 per cent of Kigali's households had access to electricity, with the government targeting 100 per cent provision within seven years. Most of these households are supplied by Rwanda's wide area synchronous grid, with only between 2 and 4 per cent of households in the three districts relying on off-grid access in 2020.