The original photograph is entitled 'Mangahao pipeline foundation tests'. An effective method of testing to see foundations were built according to specifications of the time. The Mangahao Power Station provides hydroelectric power and is situated near the town of Shannon. It serves Wellington, Horowhenua, Taranaki, Hawkes Bay, and the Wairarapa. After being delayed by WWI, construction began in late 1919 and the station opened in November 1924.