Tumut 1 Underground Power Station Located downstream of
Tumut Pond Dam and below ground level,
Tumut 1 Power Station is situated approximately south-west from
Cabramurra, under Happy Valley Road. The
conventional hydroelectric power station has four
turbine generators, with a combined
generating capacity of of electricity; and a net generation of per annum. The power station was completed in 1959, and has rated
head. The original transformer at Tumut 1 weighed ; and each assembled generator rotor is in excess of necessitating delivery in component pieces and assembly on site. The station is connected to the
National Electricity Market via the 330 kV Upper Tumut Switching Station, North of Cabramurra. The Upper Tumut Works is sometimes used as a colloquial term to refer to both Tumut 1 and Tumut 2 Underground Power Stations as well as their respective dams, tunnels and the Upper Tumut Switching Station.
Tumut 2 Underground Power Station Tumut 2 Power Station is situated approximately north of north-west from
Cabramurra, under Goat Ridge Rd, some below ground level. The conventional hydroelectric power station has four
Francis turbine generators, with a combined generating capacity of and a net generation of per annum. The power station was completed in 1962, and has rated head. Water flows through the turbines at the rate of . Pump-storage schemes use off-peak energy to pump water to a reservoir on a higher level. This water then passes through turbines to generate electricity when prices are higher. The sole powerhouse is located above ground, below
Talbingo Dam. The power station is fitted with six
Toshiba turbines, each equipped with
Melco-manufactured generators, It was completed in 1973, upgraded in 2012 and has rated head. Water is carried in six penstocks, each long and in diameter, delivering water both from and to Talbingo Reservoir. The 3 pumps draw water from
Jounama Pondage at the combined rate of , returning water to Talbingo Reservoir for later generation use in periods of peak-demand, During 2003, Snowy Hydro commissioned six micro-hydro generators on the existing cooling water systems on each of the six generating units at Tumut 3 Power Station. These GreenPower accredited units enable Snowy Hydro to save approximately of
carbon dioxide per annum. In addition, this installation not only captures previous wasted renewable energy, but also will be substantially reducing the noise that was associated with the previous pressure reducing valves on the six generating unit's cooling systems. Between 2009 and December 2011, there was a major upgrade of Tumut 3, adding additional capacity in the range of to per unit. The station is connected to the
National Electricity Market via the 330 kV Lower Tumut Switching Station, 500m North West of Tumut 3 or 3.0 km south of south-west from Talbingo. A 450 MW / 1,800 megawatt-hour
grid battery is proposed for the switching station. ==See also==