This cache is in a medium/ small container with a logbook and pencil found on the one-way bridge. There is a parking in front of the Power Station where you van stop on the Eastern Cape side and walk half way to the Free State side where the cache is hidden. Ensure the content of the container doesn't fall into the water. 
The Gariep Hydroelectric Power Station, a 360MW project on the Orange River in South Africa, commenced construction in 1967 (see image) and began commercial operation in 1971. Owned by Eskom Holdings SOC, it features a reservoir with a capacity of 5,340 million cubic meters and a net head of 55m. Four penstocks facilitate water flow to turbines, producing 889 GWh.
Gariep's significance lies in stabilizing the high-voltage system and contributing to Eskom's network at the Hydra Distribution Station. Alongside Vanderkloof Power Station, it supports the national grid during peak demand, emergencies, and base load scenarios. Both stations, situated on the Eastern Cape and Free State border, are integral to the Orange River Water Scheme, ensuring a balance between irrigation, urban water supplies, recreation, and electricity generation.
Historical facts include the station's original name honoring Hendrik Verwoerd and its role in a water-scarce South Africa. Gariep Dam, with 5,340,000 megaliters capacity, allow penstocks of 220,000 liters per second, featuring a 7m internal diameter. The station's four vertical 'Francis' generators, each at 90MW, power approximately 70,000 households.
In summary, the Gariep Hydroelectric Power Station, a vital contributor to South Africa's energy landscape, represents successful collaboration between government and energy entities, showcasing sustainable development since its inception in the late 1960s.