 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%, leading to a sharp drop in output from the power stations.This, coupled with increased demand as the economy grew, precipitated a shortfall in 2004 and widespread loadshedding.As an emergency measure, the government installed diesel generators north of Kigali; by 2006 these were providing 56% of the country's electricity, but were very costly.