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Dinorwig Power Station

Technology Type Closed-loop Pumped Hydro Storage
Rated Power 1728000 kW
Duration at Rated Power (HH:MM) 0:15.00 / 5.00
URL More about Dinorwig Power Station
Dinorwig is comprised of 16km of underground tunnels, deep below Elidir mountain. Its construction required 1 million tonnes of concrete, 200,000 tonnes of cement and 4,500 tonnes of steel. The station's six powerful generating units stand in Europe's largest man-made cavern. Adjacent to this lies the main inlet valve chamber housing the plant that regulates the flow of water through the turbines. Dinorwig's reversible pump/turbines are capable of reaching maximum generation in less than 16 seconds. Using off-peak electricity the six units are reversed as pumps to transport water from the lower Llyn Peris reservoir to the higher Marchlyn Mawr reservoir. Llyn Peris (lower reservoir) rises during the day, then falls back overnight. The smaller and higher Marchlyn Mawr reservoir up in the hills does the reverse, dropping as much as 121ft (37 metres) during the day.
This data has been validated by project staff through a review of publicly available information about the project, and verified by the project owner. Information is accurate as of 2016-04-29.
Project Status
Status Operational
Commissioning On 01.01.1984
Project Includes Multiple Systems No

Dinorwig, Wales
United Kingdom

Utility Type
Paired Grid Resource Transmission
Project Includes Multiple Systems No
Ownership & Value Chain Partners
Ownership Model Utility-Owned
Equity Owner 1 First Hydro Company
Equity Owner 1 Percent 100%
O&M Contractor First Hydro Company
Developer National Grid
Cost & Performance
Performance Synchronised and spinning-in-air emergency load pick-up rate from standby: 0 to 1,320 MW in 12 seconds; Voltage: 420 kV; Current Rating: 4,000 A
Service Use Case Electric Energy Time Shift
Electric Supply Capacity
Electric Supply Reserve Capacity - Spinning
Frequency Regulation
Load Following (Tertiary Balancing)
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