Operational Requirements for Demand Reduction
For the purposes of this document Push Button Interruptible Load Control shall be
construed as meaning the issuance of a contact closure from an Ameren owned and
operated telemetry device (e.g. RTU) the disposition of which results in the automatic
shedding of load from the Transmission system by way of operation of an Ameren owned
and operated breaker or implementation of a customer owned and operated solution
approved by Ameren.
Consistent with Good Utility Practice, Ameren shall acquire, install, own, operate,
maintain, repair and replace, and/or control, and Customer shall reimburse Ameren for all
of Ameren’s reasonable costs of acquiring, installing, operating, maintaining, repairing
and replacing such equipment, circuits, facilities and services. Ameren’s request to
Customer for reimbursement of such costs shall be accompanied by a written itemization
of the costs. Customer shall make such reimbursement to Ameren within fifteen (15)
days after receipt of such request.
In order to implement Push Button Interruptible Load Control, the following is required:





Meters and metering facilities at each delivery point capable of
(1) measuring and retransmitting instantaneous kW and kVARs at the same
frequency as the Ameren Energy Management System Polling rate, typically 4
seconds,
(2) measuring and recording kWhs at 1-minute and 10-minute intervals and 1 hour
clock intervals
(3) measuring and recording kVARhrs at a 1 hour clock interval
(4) being accessed directly by the Ameren Energy Management System (EMS) by
dedicated leased communication lines
(5) the meter’s local storage must be sufficient to hold a minimum of two months of
recorded data.
Telemetry and dedicated communication circuits must be installed at each delivery
point to transmit the kW and kVAR data to Ameren’s EMS at the same frequency as
the Ameren Energy Management System Polling rate, and to transmit the kWH and
kVARH data to the Ameren EMS on an interval determined by Ameren.
Control devices, such as supervisory controlled breakers, other circuit interruption
devices, or automatic process control or load shed functions, at each delivery point
capable of accepting a supervisory control contact closure resulting in the automatic
interruption of customers load.
Modification and/or additions to Ameren’s existing computer systems must be made
to aggregate the telemetered values and to introduce the interruptible load into these
computer systems.
Computer systems must be designed to process the telemetered data so that the
telemetered values can be aggregated and then compared to actual meter reading to
verify that the interruptible load meets contractual requirements.
Equipment installed to facilitate push button interruptible control on the Ameren system
shall be owned by Ameren but the owning and operating costs, including overheads, for
such equipment/modifications shall be recovered directly from the customers as such
costs are for the benefit of the customer. Ameren will endeavor to make use of existing
installations and facilities to the extent possible but any increased costs associated with
modifications to existing facilities shall be borne by the customer.
Protocols and processes must be established to provide for backup to the metering,
telemetering and interruptible control for the circumstance when a failure of the data
monitoring, recording or communication occurs.