Residential Pump

Pump Storage Sector

Between 2007 and 2015, the total installed capacity of renewables electricity in Scotland has more than doubled.  Due to its intermittent nature, the rise in renewable generation has resulted in increased demand for flexible capacity to help meet energy balancing requirements for the national grid system.

Pumped storage hydro is considered by the Directors to be the most developed and largest capacity form of grid energy storage that currently exists.  This can help reduce renewable energy curtailment and therefore promote grid stability.





It is widely acknowledged that greater flexibility is required in the electricity system of Great Britain (GB) to decarbonise at acceptable cost to consumers. PSH is one of the best proven technologies available at scale to provide the required flexibility.

The Carbon Trust/Imperial College produced analysis on the benefits of storage to the UK power system. This analysis was subsequently used by The National Infrastructure Commission in their ‘Smart Power’ report.

  • Savings of £2.4 billion per annum by 2030

  • The Carbon Trust/Imperial report concluded that base savings of up to £2.4 billion per annum could be realised  by installing around 6GW of additional storage capacity by 2030.   

  • The report estimated that consumers would save around £50 per year if the 6GW was built, based on them only receiving 50% of the available savings.  

  • This £2.4bn saving is only due to the reduction of investment in gas plant and the use of gas.  It does not include saving from reducing investment in networks, or from other savings.

  • The report identifies that an additional £5 billion per annum could be saved by better optimisation of the power system, making a total of some £7.4 billion pa. These are partly attributable to the availability of storage to help manage the power system, reducing the need for generation and network investment

Benefits of Pump Storage Hydro

  • It is a clean energy resource

  • It does not benefit from or require other subsidies

  • It is a proven, reliable technology, available at large scale, with an asset life of 100+ years

  • It can provide firm capacity for longer periods than batteries or demand response

  • It can mitigate network constraint costs, and reduce the need for network investment

  • It can provide the full range of balancing services, including black start, inertia, frequency response, reserve and reactive

  • It helps solve the issue of intermittency in renewable energy generation

  • It will help reduce consumer’s bills

  • It will provide long-term energy security for the UK

  • It will off-set millions of tonnes of CO2 emissions each year
In June 2021 ILI group achieved planning consent for the Red John PSH project in the Scottish Highlands.

Click here to view the planning consent >




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