1. Alistair Steele Network Connected Batteries

2. 2008 SSEPD Energy storage projects 2010 2011 2012 100 kW Flow Battery 1 MW NaS Battery 2 MW Lithium Battery 3 x 25 kW Lithium Batteries

3. Shetland 1MW Battery

4. Installed 1 MW / 6 MWh NaS battery Significant safety incident in Japan has halted progress Currently awaiting results of detailed investigation before making a decision on project status

5. LV Connected Energy Storage

6. Project drivers The uptake of low carbon technologies is already having an impact on how we operate our LV networks: - Solar PV - Heat pumps - Electric vehicles Traditional solution is to replace cable / associated plant Can energy storage be used to mitigate these effects? Is there an operational / economic case over existing solutions?

7. Overview Small array to prove functionality 3x single phase, 25kVA batteries connected at 230V Located towards the end of the circuit for SSE Zero Carbon Homes project Determine operational issues and benefits: Peak lopping demand & generation Voltage support from real / reactive power Aggregated reduction in peak demandand phase balancing

8. Network location of the batteries Low voltage connected battery project

9. Network location of the batteries Low voltage connected battery project

10. Site photographs Low voltage connected battery project

11. Installation photos – Chalvey, Slough Low voltage connected battery project

12. Installation photos – Chalvey, Slough Low voltage connected battery project

13. Communications schematic

14. Low voltage connected battery project G59/2 commissioning

15. Low voltage connected battery project G59/2 commissioning

16. Low voltage connected battery project Safety & comms testing

17. Presently have a comms fault internal to the battery in two of the units Working with manufactured to resolve situation Basic test programme started July 2012 – moving into detailed testing of the units to flatten demand and manipulate voltage Learning will feed into the larger project rollout under Tier 2 Next steps

18. Project within timescales / budget Safety case / risk assessment completed All three battery units successfully installed Manufacturer commissioning and G59 compliance completed Radio communications working as intended Enmac integration complete Test programme to run for 2 years Formal learning report released 2014 Summary

19. Orkney Energy Storage Park

20. Orkney battery - Technology

21. Orkney battery - Service Based Contract Battery not owned or operated by network business Service procured – Constraint management Battery owner free to trade across multiple markets

22. Thank you very much for your attention