Power Corridors: For years, the cornerstones of Iraq's electricity supply were steam-thermal generating plants [green] in the south and hydroelectric plants [blue] in the north. During reconstruction, engineers added 30 combustion turbines [orange], which have proven difficult to operate in Iraq's tumultuous environment. Problems with fuel, maintenance, and operational procedures have meant that only a small fraction of Iraq's installed capacity is actually available on the grid. Baghdad, which accounts for 40 percent of Iraq's demand for electricity, gets almost half of its power from plants in the north and south of the country.