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Sun Moon Lake is not just a tourist destination, but a key pumped-storage hydropower reservoir. Taipower recently upgraded the system, including raising the dam of the downstream Minghu Reservoir to increase water capacity by nearly 1 million tons. It’s expected to generate an additional 222.3 million kilowatt hours of electricity annually, expanding the lake’s role as a “giant battery.”

Sun Moon Lake is renowned for its beautiful scenery, but it’s also a key pumped-storage hydropower reservoir. Taipower recently upgraded the system, raising the dam of the downstream Minghu Reservoir to increase its water capacity, and in turn increasing the amount of energy the system can store.

- Everything below here was all updated.
- All of it was changed?
- Everything was updated, even the operating facility was changed.

Taipower scaled up the system’s size and capacity. The water level in the reservoir’s dam was raised by 1.9 meters, increasing storage by nearly 1 million tons to bring the total capacity to 7.9 million. This is expected to generate over 200 million kilowatt hours more electricity annually, strengthening Sun Moon Lake’s role as a “giant battery.”

Teng Wen-kuei
Hydropower plant deputy director
The project cost NT$240 million and took two years to complete. It increased reservoir capacity by 1 million tons and is expected to increase annual power generation by 222.3 million kWh. We are conducting high water level tests currently and expect to finish those in April.

After moving downstream and generating electricity, the water is stored in the downstream Minghu Reservoir. When power demand is low and supply is plentiful, it is pumped back up to Sun Moon Lake and can be used to generate electricity again when it flows back downstream later. This cycle lets the same water be used repeatedly, turning the system into a giant battery.

Teng Wen-kuei
Hydropower plant deputy director
When power supply faces peak demand and emergencies, Sun Moon Lake acts like a kind of relief pitcher, coming in for more innings to generate electricity and provide support.

With its expanded power capacity, Sun Moon Lake will be able to more effectively support Taiwan’s power supply.

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