adjacent Kiira Power Station. The concession agreement commenced in 2002. The electricity generated here, is sold to the Uganda Electricity Transmission Company Limited (UETCL), the authorized single buyer. UETCL in turn sells the power to Umeme, the energy distributor. Maintenance In 2021, Eskom Uganda Limited hired Babcon Uganda Limited at a cost of USh888 million (approx. US$251,000) to repair and strengthen the powerhouse staircase to Units 1, 5 and 9. The deterioration of the staircase is blamed on Alkali Silica Reaction (ASR), which results when water reacts with concrete, over time, causing expansion of the concrete and loosening of attached hardware. In September the same year, Sinohydro Corporation Limited completed renovations to the dam's structure. The repairs that lasted nearly one year, were meant to stop water leakages due to "deterioration of grout curtain". It is expected that the repairs, last carried out in 1999, will give the dam at least another 20 years of life. The repairs cost USh11.6 billion (US$3.3 million). In September 2022, Eskom Uganda spent UGX:6.84 billion (approx. US$1.8 million) to replace three of the ten generator transformers. The transformers to units 3, 5 and 6 "were past their service life expectancy" and were replaced. The transformers from units 1 to 4, step up voltage from 11kV to 33kV, while those from units 5 to 10 step up voltage from 11kV to 132kV. The power at high voltage is then transmitted across the grid. Transmission of power at high voltage over long distances reduces power losses. Owen Falls Extension In 1993 work started on the Owen Falls Extension project, a second powerhouse located about 1 km from the 1954 powerhouse. A new power canal was cut to bring water from Lake Victoria to the new powerhouse. Major construction was completed in 1999 with first power from the project from two units in 2000. The extension has space for five hydroelectric turbine generators with four installed as of 2001. Each unit at the extension has a capacity of 40 megawatts. During official opening ceremonies in 2003, the extension was named the Kiira Power Station. Design and project management of the extension project was by Acres International of Canada, now known as Hatch Limited. ESKOM Uganda operates Nalubaale Power Station as a concessionaire. They regularly clear debris water hyacinth from the intakes of the stations. Further downstream, the 250 MW Bujagali Hydroelectric Power Station was constructed between 2007