The Anonymous Widower

Errochty Hydro-Electric Power Station

The Errochty hydro-electric power station is one of the stations in the Tummel hydro-electric power scheme.

This Google Map shows the relative locations of Lochs Errochty, Rannoch and Tummel.


  1. Loch Errochty is at the top in the middle.
  2. Loch Rannoch is in the West.
  3. Loch Tummel is in the East.

This Google Map shows the Eastern end of Loch Errochty.

Note the dam at the Eastern end of the loch.

  1. The dam is 354 metres long by 49 metres high.
  2. The dam was built in 1957 and the lake is man-made.
  3. The loch stands at 330 metres above sea level.
  4. Water flows from the loch to the Errochty power station at the Western end of Loch Tummel, through a ten kilometre long tunnel.

This Google Map shows Errochty power station and Loch Tummel.


  1. Errochty power station is at the top of the map in the middle on the channel connecting it to the River Tummel.
  2. Errochty power station has two turbines and a maximum output of 75 MW.
  3. There is what appears to be a large switching station at the Western side of the map.

This page on the Strathclyde University gives a list the pumped storage potential for the Scottish hydrogen-electric power stations.

It states that the Errochty power station and Loch Errochty have a potential to be upgraded into a 16 GWh pumped storage scheme.

I obviously don’t know for sure, but I suspect this could be an easier scheme to convert, if the current turbines could be replaced with pump/turbines.

Water Supply To The Loch

There is a section with this title in the Wikipedia entry for Loch Errochty.

This is said.

Loch Errochty’s main feeder streams are the Allt Sléibh and the Allt Ruighe nan Saorach which both rise in the high ground to the west of the head of the loch. Other small streams flow directly off the 892-metre-high (2,927 ft) mountain of Beinn a’ Chuallaich which stands just to the south. Supplementary water is diverted into the loch from the east by the Errochty catchwater, a system of tunnels and surface pipelines at a height of approximately 380 metres which redirects water from five small tributary streams of the River Garry, and the Garry itself. The catchwater then goes through a tunnel in the hill which separates the Garry and Errochty valleys to join the loch. This method of re-directing water allows it to be used more often to generate electricity. Some of the water within the Tummel scheme passes through five of the power stations and thus generates electricity five times.

That strikes me as being very sophisticated for the 1950s and if the engineering and tunnels are up to a high standard, it might be that conversion of this power station to a 75 MW power station with 16 GWh pumped storage is a distinct possibility.

It might even be possible to increase the generating capacity of the power station.

February 19, 2022 - Posted by | Energy, Energy Storage | , ,

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