Monitoring combined sewer overflows (CSOs) - This measures the number of event duration monitors (EDMs) installed. There are 714 outputs required in the NEP by March 2020. Prior to 2015, we installed CSO monitors on 278 sites. This measure is the percentage of these outputs we have achieved, including those prior to 2015.
We were targeted with achieving 100% of the installations by the end of 2019-20; so we will have installed monitors at all environmentally sensitive CSOs by the end of the price control period. This measure has the potential for a customer refund; for each 1% we miss the target by we will refund £10k.
We met our target for 2019-20, and for the AMP as a whole, by installing 210 EDMs over the past 12 months. At the end of 2019-20 we are monitoring 992 of our 1,289 known overflows, which also meets the target for having 75% of our overflows monitored by 2020.