Chamber and committees

As part of Scottish Water’s emergency contingency planning, many of its Water Treatment Works already have permanent standby generators in place to ensure supplies can be maintained in the event of loss of power. During these recent storms, those permanent generators protected the water supply for the majority of the 1.5 million customers being supplied in the areas affected by the storm.

In addition to this, Scottish Water holds a stock of emergency response generators that can be deployed when needed for pumping stations, and it has a framework supplier who provides additional hire generators as required. Due to storage in the water network systems, the water supply is not immediately lost in the event of power loss, hence the reason for the different approaches to Scottish Water’s current generator back up strategy between treatment works and pumping stations. This event, which had more widespread and lengthy power outages than Scottish Water has experienced before, challenged its plans for deployment of portable generators to small pumping stations, affecting a small number of customers. During Storm Arwen Scottish Water also deployed tankers to pump water into its networks and also deployed bottled water to assist customers.

In view of the extended power outage experienced by this storm, Scottish Water will review its emergency generator contingency plans, particularly in relation to pumping stations. This work is underway to determine where improvements to the provision of both permanent and emergency generation capability is needed and establish the right level of investment required to protect customers in the future.