Participant Technical Reference Manual - IESO

3.Dispatch Information
IMO_MAN_0024
c. A Web Client providing user interface for the WEB-Based Message Exchange java applet.
The software as shown on the “IESO Supported Client Platform” web page is required in
order to execute the Message Exchange Applet.
d. The ME Database Server is responsible for storing and retrieving the messages and their
status. This database will support both WEB & ICCP.
e. The ME Application Server will co-ordinate the message exchange between different
functions. It is responsible for message scheduling and tracking (both WEB and ICCP).
3.2.3 Dispatch Messaging
206 The dispatch messages are generated automatically by the dispatch algorithm
every five minutes. The Exchange Coordinator (EC) monitors the dispatches
and the EC can prevent the messages from being sent out in the event of a
system disturbance while activating operating reserve.
207 The availability and reliability of the supporting facilities must be such that the
following criteria is met:
a. The Exchange Coordinator (IESO BES Control Room Operator), in not more than sixty
seconds after issuance of the dispatch message, must receive the acknowledgement and
compliance indication after issuance of the dispatch instruction.
b. The acknowledgement of receipt of a dispatch message is automatically performed by the
Client application (either IESO provided or market participant). The compliance is a
manual action by the market participant to accept or reject the instruction.
c. The IESO shall manage and/or control the ICCP and Web-Based communications facilities
that support the transmission of dispatch instructions to the market participants’ dispatch
agent at the point of system injection.
d. Failure of any of the facilities such that the dispatch message and/or the reply are not
sent/received is alarmed through monitoring software to the Exchange Coordinator upon
detection. The alarm is displayed within the message dispatch tool and it will be logged in
the systems control log. The alarm indicates the actual, or most likely, reason for the failure.
e. An outage to any of the supporting message dispatch facilities must be addressed with the
highest priority.
Dispatches Processed Through Message Exchange
Energy Dispatch
208 The IESO issues dispatch instructions for each registered facility, other than a
boundary entity and an hour-ahead dispatchable load facility, prior to each
dispatch interval, indicating for that dispatch interval:
• The target energy level to be achieved (in MW) by the facility at the end of the dispatch interval
at a rate, in the case of a dispatchable load, equal to the rate provided by the market participant
as dispatch data, and in the case of a generation facility equal to the most limiting of:
• The last dispatch instruction and offered ramp rate: or
• Actual MW output and the generations facility’s effective ramp rate
Reserve Dispatch
60 Public Issue 21.1 – March 15, 2010 - estimated