Demand Side Management - Thermal Storage

Project Lead: Shetland Islands Council

Partners: N/A

Award Amount: £20,000

Status: Complete (January 2015), Output Report published

Area: Shetland

Shetland Island Council commissioned a feasibility study, funded by CARES IIF, to assess the viability of installing large scale thermal storage tanks as a replacement to fossil fuels currently providing the heating and hot water to council properties. The concept of using thermal storage tanks, which can be linked to (combined with) the North Isles New Energy Solutions (NINES) Active Network Management electricity grid system, is based on the smart hot water cylinders currently installed in domestic properties as part of the NINES project. By providing a larger volume of water this enables a larger amount of controllable demand available to the network operator, which in turn can be used to better stabilise the electricity profile and reduce constraints on generation and encourage more renewable generation to connect. Amongst other things, the report produced firstly concludes that, due to the isolated nature of Shetland’s electricity system that is independent of the mainland grid, the reasons for wind turbine curtailment are likely different to that of mainland installations. Consequently, a simple replication of Orkney’s active network management (ANM) system is not viable. Also, it is more cost-effective for any form of demand side management (DSM) to draw heat from larger, council run sites than to connect with domestic properties. Proven technology – such as electric immersion heaters – could be used as part of an implemented DSM during periods of low demand.

Learning Point(s)

The original scope of the feasibility report included measuring the potential reduction in curtailment of the Garth Wind Farm as a result of demand side management. The challenge for the project was that the DNO, Scottish Hydro Electric Power Distribution, determined it was unable to release the necessary information. This removed the provision for a Modelling Workstream relating to Garth Wind Project.

LES Advice:

Engage with all potential/identified stakeholders of the project as early as possible in order to avoid any false assumptions or delays in ability to support the project, which could otherwise influence the project’s viability and/or projected outputs.

Supported Documents  / Outputs

Shetland Islands Council – Demand Side Management Investigation (2015)