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Scotland, United Kingdom

Cruachan 2

Pumped Storage Hydro Project

Scotland, United Kingdom

Cruachan 2

Cruachan 2 pumped-storage project foresees the development of a new underground power station adjacent to the existing 440 MW Cruachan I, which is one of the four operational PSH facilities in the UK.

 

The plant will use the hydraulic head between the existing reservoir on the Ben Cruachan massif and lower Loch Awe to generate about 600 MW of electricity:

– providing storage capacity and ancillary services to the grid
– providing peak power and capacity for renewables integration

The opportunity to expand the existing Cruachan 1 allows the use of the existing infrastructures with large savings in terms of costs and environmental impact.

Scotland, United Kingdom

PLACE

Drax Cruachan Expansion LTD

CLIENT

2023 - 2024

YEAR

Main Features

  • Existing upper reservoir (V = 11.4 Mm3)
  • Concrete buttress dam (H = 46 m, L = 320 m), constructed in the 1960’s
  • Natural lower reservoir (Loch Awe)
  • Waterways:

– Upper intake (Q = 205 m3/s) through a lake tap from the existing reservoir
– headrace tunnel (L = 205 m, D = 7.5 m)
– upper surge shaft (H = 79 m, D = 14 m); upper gate shaft (H = 37 m, D = 15 m)
– steel lined penstock shaft (L = 388 m, D = 7.5…5.7 m) ending into manifolds
– lower surge shaft (H = 90 m, D = 12 m); lower gate shaft (H = 34 m, D = 15 m)
– tailrace tunnel (L = 1283 m, D = 8.5 m)
– lower intake on Loch Awe

  • Main access tunnel (D= 8 m, D-shaped, L = 1.3 km)
  • Powerhouse cavern (22 x 44 x 133 m, hosting No. 4 reversible pump-turbines, IP = 600 MW)
  • Transformer cavern (19 x 27 x 126 m, hosting No. 4 transformers, 16 kV to 275 kV)
  • HV Insulated cables (L=1km, V=275kV) and extension of existing 275kV Dalmally substation

United Kingdom, Scotland

Cruachan 2

Engineering
Services

Review and upgrade of the existing design

Basic design

Tender documents for Electromechanical bid

Tender documents for FEED-EPC civil works bid

Assistance during procurement

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