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Tongland Power Station

Hydroelectric Power Station (Modern)

Site Name Tongland Power Station

Classification Hydroelectric Power Station (Modern)

Alternative Name(s) Galloway Hydroelectric Scheme; Galloway Hydros Visitor Centre

Canmore ID 69356

Site Number NX65SE 86

NGR NX 69488 53563

NGR Description centred

Datum OSGB36 - NGR

Permalink http://canmore.org.uk/site/69356

Ordnance Survey licence number 100057073. All rights reserved.
Canmore Disclaimer. © Copyright and database right 2018.

Digital Images

Administrative Areas

  • Council Dumfries And Galloway
  • Parish Tongland
  • Former Region Dumfries And Galloway
  • Former District Stewartry
  • Former County Kirkcudbrightshire

Archaeology Notes

NX65SE 86.00 69488 53563

NX65SE 86.01 NX 69540 53605 Surge tower

NX65SE 86.02 NX 69479 53669 Transformer Station

For (associated) Tongland Dam and Tongland Tunnel (aqueduct), see NX75SW 37 and NX75SW 43 respectively.

Power Station [NAT]

OS 1:10,000 map, 1990.

Power Station [NAT]

OS 1:50,000 map, 1996.

Tongland Power Station: 1st stage of project

Average net head: 102ft (31.9m)

Catchment area: 396 sq miles (121 sq km)

Max. load: 33,000 kW [58% of 1st stage total: 33% of grand total]

Units per annum: 68 million [63% of 1st stage total: 37% of grand total]

No. of main turbines: 3

Tongland power station, surge tower etc: Wm. Taylor and Son (Glasgow) Ltd.

Tongland, rack cleaning machine: Blakeborough and Co. Ltd.

This power station has three 11,000kW vertical Francis turbines. The tailrace extends about 300ft (91.5m) below the powerhouse, and has been formed by the excavation of the rock in the bed of the river, which is tidal up to a point beyond the power station. The average net head available is 102ft (31.1m).

Anon. 1934 ['Galloway Water Power Scheme'].

(Detailed description of power generation equipment and switchgear).

English Electric Company Limited [post-1936].

Tongland Power Station

Catchment area: 395 sq mi (1023 sq km)

Average net head: 106 ft (32.3m)

Water consumption on full load at average head: 4250 cusec

Number and size of units: 3x11000kW, 1x250kW

Gross volume of turbine room (incl. loading bay), above main floor level = total: 420,000 cu ft (11893.3 cu m)

Gross volume of turbine room (incl. loading bay), above main floor level = per kW: 12.6 cu ft (0.36 cu m)

Range of net heads: 95-114ft (29-34.8m)

No. of rating of generator sets installed: 3x11,000 kW

Turbine output: 15,500 hp

Specific speed: 84 rpm

Normal speed: 214.3 rpm

Runaway speed: 418 rpm

Water consumption per turbine on full load at average head: 1414 cusecs

Diameter of runner: 8ft 8ins (2.64m)

Auxiliary set: 250kW, water consumption 35 cusecs

This power station is intended for manned operation, and is also the remote control station for Glenlochar Barrage (NX76SW 40). It houses the memorial plaque to William McLellan (1874-1934), who conceived the scheme.

Anon. 1938 ['Galloway Hydro-Electric Development'].

[Constructed] by Sir Alexander Gibb and Partners, 1934, as part of the Galloway hydro-electric scheme.

J Gifford 1996.

Tongland Power Station was built in 1936 by Merz and McLellan, and Sir Alexander Gibb and Partners, engineers, and is the lowest and largest such station in the Galloway Hydro-Electric Scheme. The concrete building is in the art deco style, and is complemented by a surge tower of rivetted steel construction on reinforced concrete arches. Water is supplied from a reservoir impounded by a concrete arch and granite dam with monumental flood gates.

J R Hume 2000.

This power station is open to the public as a visitor attraction under the title 'Galloway Hydros Visitor Centre'.

Source: 'Harnessing the Power of Nature' [Scottish Power information leaflet, 2006].

Activities

Publication Account (1934)

Tongland Power Station: 1st stage of project

Average net head: 102ft (31.9m)

Catchment area: 396 sq miles (121 sq km)

Max. load: 33,000 kW [58% of 1st stage total: 33% of grand total]

Units per annum: 68 million [63% of 1st stage total: 37% of grand total]

No. of main turbines: 3

Tongland power station, surge tower etc: Wm. Taylor and Son (Glasgow) Ltd.

Tongland, rack cleaning machine: Blakeborough and Co. Ltd.

This power station has three 11,000kW vertical Francis turbines. The tailrace extends about 300ft (91.5m) below the powerhouse, and has been formed by the excavation of the rock in the bed of the river, which is tidal up to a point beyond the power station. The average net head available is 102ft (31.1m).

Anon. 1934 ['Galloway Water Power Scheme'].

Field Visit (2010)

This is the most southerly of the powerhouses on the Galloway scheme and generates prior to the water going out to sea. Water going through the turbines in Tongland PowerStation will already have been used four times previously to generate electricity. The powerhouse site also houses the surge tower which protects both penstocks and turbines from sudden fluctuations in water level. Tongland is the largest station on the Galloway scheme (making use of all available water). This complex of buildings is an outstanding example of the application of early modernist design principles to an industrial setting, with a functionalist classical design scheme. The architectural treatment of the building is high quality with the original form and glazing pattern broadly retained. Many original interior features, such as panelling, are also retained. The landscape contribution is significant with the powerhouse set prominently against a busy A road.

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