Gitaru power station is the biggest station in terms of installed and effective capacity. The highest recorded combined output was on 22nd May 2002 when the output was 222MW and in November 2006 the unit recorded 220mw during one evening peak.

The number of units installed are three, producing a total capacity of 225 MW which is the biggest hydro in E. Africa. Number 1 was commissioned 1999 with a rated capacity of 81.5.MW. the second and third were installed in 1999 rating a capacity of 72.5MW.The dam has a  capacity of 20 million cubic metres of water and occupies a surface area of 3.1 sq. km.