| Year of award: | 1988 |
| Commissioning | 1993 |
| The rapidly increasing demand for energy in Taiwan, called for the implementation of a second pumped storage scheme. The Mingtan project, a 1,650 MW pumped storage plant and with 6 reversible pump turbines, one of the largest schemes in the world, was built in the years 1988 - 1993. For this project, Taiwan Power Company awarded VA TECH HYDRO the contract for design, fabrication and installation of approx. 26,000 tons of penstocks. The Sun-Moon lake, a famous recreation and holiday area, is used as the upper reservoir of the scheme. From there, two independent waterways lead to an underground power house. For the lower reservoir, a 61.5 m high gravity concrete dam was built at the Shuili River. The headrace conduits have a length of approx. 3.1 km each, including the steel lined crossings of Tousheh River Valley. Except the bifurcators, which needed prefabrication in Austria due to their shell thicknesses, all the fabrication was executed directly at site in a temporary workshop. This workshop was equipped to allow for a prodaction of 1,000 tons of pipes per month. Tonnagewise, MINGTAN is the biggest project ever executed with site fabrication and it remarkably contributes to increase VA TECH HYDRO's record in this construction technology to now almost 170,000 tons. |
Technical Data:
Steel Lining (Headrace Tunnel)
| Head | 102 | - |
| Length | 100 | m |
| Diameter | 7.5 | m |
| Plate thickness | 25 | mm |
| Material | SM53CN | - |
| Weight | 568 | to |
Steel Lining / Exposed Penstock (Tousheh River Crossing)
| Head | 182 | - |
| Length | 1040+940 | m |
| Diameter | 6.8 | m |
| Plate thickness | 29-36 | mm |
| Material | SM53CN | - |
| Weight | 12,930 | to |
Steel Lining / Manifold (High head Penstock)
| Head | 575 | - |
| Length | 913+802 | m |
| Diameter | 6.0/4.57/3.23/2.3 | m |
| Plate thickness | 46-46-133 | mm |
| Material | HT60, HT80 | - |
| Weight | 12,451 | to |
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