- (1.) THE petitioner, Northern Regional Load Despatch Centre has filed this petition for implementation of frequency linked Unscheduled Interchange (UI) mechanism on hydro generating stations owned and operated by Bhakra Beas Management Board (BBMB), for overall economy and efficiency in grid operation.
(2.) The petitioner informed that BBMB generating stations have 2866 MW generating capacity. Its beneficiary states are Punjab, Haryana, Rajasthan and Himachal Pradesh. BBMB has maximum reservoir based generation and it can be varied to dampen the frequency spikes and dips within the limits of schedule of overall generation and water releases for the day. Currently, BBMB is out of ambit of the UI mechanism, which means that while calculating the UI charges the dispatched schedules issued to BBMB generating stations are replaced by their actual generation. Thus, due to post facto revision of BBMB schedules, the incentive to flex generation in response to the real-time variation in grid frequency is absent in BMMB power stations.
(3.) THE petitioner submitted that under the proposed mechanism, BBMB could continue to finalize the schedules of its generating stations in consultation with the beneficiary States, taking into account all hydraulic constraints and agreements with partner States on water releases etc. UI computation can be implemented as the Special Energy Meters (SEMs) have already been installed at all BBMB power stations. With introductions of UI computation for BBMB stations, partner States would enhance the accuracy of their load forecasts and this would further optimize the scheduling of BBMB generation. THE ultimate objective of this petition is to achieve overall economy and efficiency in grid operation.;