Market Operations – Medium and Short Term Planning
Narrative
As the electricity industry is
deregulated, and as FERC defines more clearly what the market
operation tariffs will encompass, three possible Regional Transmission
Organizations (RTOs) in the Western Interconnection are developing
seamless interfaces for Market Participants to submit energy schedules
and ancillary service bids across these 3 RTOs. The 3 RTOs are
California ISO (existing ISO handling the electricity market in
California), RTO West (potential RTO of many northwestern utilities),
and WestConnect (potential RTO of many southwestern utilities). These
3 RTOs are developing the requirements for the Western RTO functions.
The following is a list of Western RTO
functions related to medium and short term planning for market
operations. The four functions with asterisks are described in this
document.
The purpose of RTO/ISO/TransCos/DisCos Forecast
Load function is to provide load MW estimates for each region and
local area, based on energy schedules, weather forecasts, historical
load shapes, forecast special events, and expected new loads at their
connection points , directly involving RTOs, transmission owners,
distribution companies, National Weather Services, Market
Participants, Energy Service Providers, and Customers, performing
regional and local load forecasts for different time periods, updating
the precision of the forecasts, as each time period approaches, with
key interfaces between
1. all three types of utilities:
RTOs, transmission owners, and distribution companies
2. Utilities and National Weather
Services
3. RTOs and Market Participants
4. DisCos and Energy Service
Providers
5. DisCos and Customers,
Diagram - Load Forecast
Steps - Load Forecast
#
Event
Name of Process/Activity
Description of
Process/Activity
Information Producer
Information
Receiver
Name of Info Exchanged
IntelliGrid Architecture Environments
1.1a
Periodic or event driven
Load estimates
Provides
load MW estimates from Day Ahead
schedules as an auxiliary source of LF
data
Scheduling Coordinator
7-day
Load Forecast
Load estimates
User Interface
1.1b
In parallel to step 1a
Forecast weather
Provides
weather forecasts and updates for each
region
The purpose of Outage Scheduling by TransCos
and GenCos is to propose scheduled transmission and generation outages
which are validated via the Congestion Management Analysis function
(see below) to determine if any major conflicts exist that could cause
power system problems.
Diagram
Steps
#
Event
Name of Process/Activity
Description of
Process/Activity
Information Producer
Information
Receiver
Name of Info Exchanged
IntelliGrid Architecture Environments
2.1a
As needed before a specific day and time when maintenance
coordination is to be performed
Send generation outages
(1a) Send
Day Ahead Local Generation Resources (LGR)
outages, limit and ramp rate changes,
and notification of non-LGR units
RTO/ISOs must perform congestion management and security analysis
on submitted energy schedules (depending on market design), focusing
on the impact of the proposed energy on system conditions, in order to
determine probable ancillary services and any violations of power
system security conditions.
Diagram
Steps
#
Event
Name of Process/Activity
Description of
Process/Activity
Information Producer
Information
Receiver
Name of Info Exchanged
IntelliGrid Architecture Environments
3.1a
Periodically and/or at specific times and dates
Update constraints
(1a)
Update transmission path constraints for
each future hour
IntelliGrid Architecture
