The CLASS (Customer Load Active System Services) Project consisted of four trials, carried out over a 12-month period, developed to demonstrate how voltage management techniques can reduce demand.
Trial 1: Investigated the voltage/demand relationship for normal increments and decrements of system voltage at primary substations across an annual period. The outcome from this trial is a half-hourly voltage/demand relationship matrix, developed by The University of Manchester (UoM), with the purpose of providing an understanding so that voltage control can be used to manage demand.
Trial 2: Investigated demand response for peak load reduction in order to prevent or defer network reinforcement.
Trial 3: Investigated demand response during frequency events to support the NETSO. This was done by opening one of a pair of primary transformer circuit breakers or by changing on-load tap positions of primary transformers.
Trial 4: Investigated the viability of the tap staggering technique for the provision of reactive power services (i.e. regulation for high voltages) to the national electricity transmission system operator NETSO and distribution network operators.