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CAISO's Energy Imbalance Design

CAISO Market

CAISO EIM Concept

Can include Balancing Authorities Located within the CAISO footprint that are excluded from the CAISO full market.

EIM Summary

  • Balancing Authorities Retain All Authority

+ Maintaining System Reliability (NERC)

+ Ancillary Services

+ Resource Adequacy (WECC)

+ Approving/Denying Outages

+ Granting Transmission Service & Approving Tags

  • EIM Benefits

+ Economically 15 and 5 minute dispatch resources

+ Provides Geographical Diversity of Load and Resources to

provide economical dispatch while supporting requirements intermittent and other concentration of resources.

+ Enhances Reliability through Visual and Situational Awareness

of Resources and Transmission Across the Footprint.

+ Provides easy entrance/exit of additional BAs

EIM Summary

  • The EIM does not:

+ Dictate how the BA Operates its region.

  • The EIM does:

+ Require the BA to provide balanced 15 minute schedules at

40 minutes prior to the start of the period.

+ Requires Energy Offers from Resources with GHG (Green

House Gases) offers.

+ Supports 15 minute E-Tags and 5 minute resource dispatches.

Overview of the Design

Overview of the Software Needs

Balancing Authority Software Needs

Internal Software Needs:

  • Software to verify 15 Balanced schedules from companies and adjust/modify them when they are not Balanced. Verify against limits and those resources supplying A/S.
  • Software to verify, track and settle 15 minute submitted and CAISO adjusted schedule.
  • Settle A/S requirements (Current Need).
  • Need to store resource limits from entities within the BA.
  • Need to store resource outages (not sure if from CAISO's or independently provided by entities within the BAs.
  • Store 15 minute and 5 minute CAISO dispatches.
  • Regulate from the CAISO 5 minute dispatch SCED.
  • Enhanced software to track meter data, 5 and 15 minute interchanges
  • Review, store and approve 15 minute E-Tages

Software Needs Related to Entities within BA:

  • Software to receive 15 minute schedules from entities within the BA.
  • Software to send finalized 15 minute schedules back to companies within the BA.
  • Software to produce settlement statements and invoices to entities within the BA.
  • Software to capture resource limits.
  • Software to capture load forecasts from BA entities.
  • Capture resource outages
  • Receive/Approve 15 Minute E-Tages

Software Needs Related to CAISO:

  • Send 15 minute balanced schedules to CAISO.
  • Receive from CAISO 15 minute adjusted schedule.
  • Receive from CAISO 15 and 5 minute dispatch schedules

Generation/Load Companies Software Needs

Internal Software Needs:

  • Calculate resource offers including GHG (Green House Gases) offer
  • Store resource limits & offers
  • Calculate 15 minute schedules between resources and load
  • Calculate 15 minute load forecasts
  • Store 15 adjusted and 5 minute CAISO dispatch instructions
  • Store 15 minute BA adjusted resource schedules
  • Adjust resource limits and offers based on A/S being delivered to the BA.
  • Validate BA Settlement and Invoices
  • Validate CAISO Settlement and Invoices
  • Track A/S Offers
  • Track and calculate 5 minute metering on resources and loads
  • Track resource outages
  • Store 15 and 5 minute dispatch prices
  • Track GHG compliance and credits received from CAISO

Software Needs Related to Interfacing with BA:

  • Submit 15 minute balanced schedules
  • Submit resource limits
  • Submit outage information
  • Calculate 15 minute load forecasts
  • Submit 5 minute meter information
  • Download 15 minute BA adjusted schedules
  • Download BA Settlement Statements and Invoices
  • Submit/Download 15 minute E-Tages

Software Needs Related to Interfacing with CAISO

  • Receive 15 minute and 5 minute dispatch
  • Download settlement statements and invoices
  • Submit Resource Outages
  • Submit Resource Limits
  • Submit Resource Offers including GHG offer
  • Provide Default Resource Offers for Market Mitigation
  • Download 15 and 5 minute prices
  • Download GHG clearing information
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