28/09/2026
It is time for a seismic shift in our latest blog, where we get the perspective of a systems engineer, sharing his thoughts on electricity generation and geology. See our blog for the full letter - https://savelochness.co.uk/a-seismic-shift-a-systems-engineers-perspective/
'The planned and existing Pumped Storage Hydro Electricity schemes on Loch Ness piqued my curiosity a little while ago. Comrie is located on the Highland Fault was famous for earth tremors which peaked in the 1830s. Loch Ness is in the Great Glen another geological fault line which runs across Scotland south west to north east. This is a major fault with other smaller associated faults around it. There have been tremors in the area in the recent past. A 5.1 magnitude tremor in 1816, 4.0 in 1888, 4.5 in 1890, 5.0 in 1901 amongst the biggest and most recent are 3.1 magnitude near Drumnadrochit in 2025 and one of 2.5 in July 2026. So, although the fault is said to be stable it is not tremor free.
There are several reasons to be concerned about building pumped storage power stations in an area like this. Large reservoirs in areas where there are faults can force water into the cracks changing the structure and causing movement along the fault line. Moving large volumes of water, potentially twice or more times a day, will cause the land to sink and rise as the mass of water moves. This has been known to trigger tremors in other locations globally and is known as Reservoir Induced Seismicity or RIS. Excavation of huge underground chambers redistribute stresses in the surrounding rocks this can take time to stabilise. The water in the reservoir can potentially enter existing faults and cause movement by reducing friction between the rocks. Work can be undertaken to mitigate this at the head reservoir but it is not guaranteed to be 100% successful and nothing can really be done to Loch Ness itself. Tremors of between 1 and 2 and stronger on the Richter Scale are known from other schemes around the world. Much stronger tremors although claimed to be unlikely are possible.
The limit for tremors induced by fracking for gas in the UK is set at 0.5 magnitude, a political choice. A tremor of 2.5 is, due to the way the scale works, is roughly 1000 times stronger than the fracking limit. There is no limit on tremor strength for Pumped Hydro electricity generation as far as I am aware. The reason for the difference would appear, for a cynic, to be that Pumped Hydro is green renewable supporting other green renewable electricity generation. So, residents near shale gas deposits are protected from earth tremors whereas those near renewable energy are not.'