Examples of inefficient energy use in Brazil include the reduced role of cogeneration, the high proportion of incandescent bulbs (basically the same as designed by Edison 120 year ago) in use, and the widespread use of sport utility vehicles (SUVs). Inadequate rules which send wrong signals to the market also hinder EE improvements. For instance, the present rates structure leads to such a high average price of electricity during peak hours - quite above its supply cost - that many consumers are supplementing their energy consumption during peak hours with local diesel power generation.