Transmission-Distribution Coordination

Why it matters

DER dispatch and aggregation can affect both transmission-level objectives and local distribution reliability.

Confirmed design

ERP is advancing market-operational coordination and data sharing while leaving distribution-system control with LDCs.
Sources: Presentation · IESO Response to Feedback
Predecessor DER engagement considered roles spanning IESO and distributor responsibilities.
Sources: Final Engagement Summary Report · Electricity Distributors Association

Implementation status and limitations

Current ERP DER design remains under engagement.

Predecessor work provides lineage but not final ERP operating procedures.
Sources: Final Engagement Summary Report

Open questions

How will conflicting constraints and instructions be detected, prioritized, and resolved?

Build a handoff from this dossier

Build a source-bounded prompt locally. Nothing is sent until you choose what to do with it.

Question or outcomeAnalysis depth

Selected evidencePresentationIESO Response to FeedbackFinal Engagement Summary ReportElectricity Distributors Association

Generated handoff

# ERP Phase 1 evidence handoff

## Outcome
Explain the selected ERP material and identify the implications for Phase 1 work.

## Selected evidence
- [2026-07-21-presentation-presentation-c75445cc] Presentation — IESO; 2026-07-21; authority: primary-supporting; review: reviewed; https://www.ieso.ca/-/media/Files/IESO/Document-Library/engage/erp/ERP-DER-20260721-Presentation.pdf
- [2026-06-09-response-ieso-response-to-feedback-2879b427] IESO Response to Feedback — IESO; 2026-06-09; authority: ieso-response; review: reviewed; https://www.ieso.ca/-/media/Files/IESO/Document-Library/engage/erp/ERP-DER-20260609-IESO-Response-to-Feedback.pdf
- [2022-08-18-supporting-document-final-engagement-summary-report-17f34e5a] Final Engagement Summary Report — IESO; 2022-08-18; authority: historical; review: unreviewed; https://www.ieso.ca/-/media/Files/IESO/Document-Library/engage/enabling-resources/er-20220818-final-engagement-summary-report.pdf
- [2021-05-12-supporting-document-electricity-distributors-association-9765a791] Electricity Distributors Association — IESO; 2021-05-12; authority: historical; review: unreviewed; https://www.ieso.ca/-/media/Files/IESO/Document-Library/engage/enabling-resources/er-20210512-electricity-distributors-association.pdf

Selected concept dossiers:
- [transmission-distribution-coordination] Transmission-Distribution Coordination: The operating coordination needed where wholesale-market actions and distribution-system conditions interact.

## Authority rules
- Treat current IESO-authored design memos as controlling program design unless a later Market Rule, Market Manual, or IESO publication supersedes them.
- Do not claim implementation unless a Market Rule, Market Manual, or other official implementation source proves it.
- Keep stakeholder submissions attributed to their authors; attribute stakeholder positions and do not present them as IESO decisions.
- Use superseded and historical sources only for lineage. Label what changed.
- Treat recordings as catalog-only unless a reviewed transcript is explicitly supplied.
- If two sources conflict, prefer the later higher-authority source and describe the conflict.

## Citations
Cite every substantive claim with document title, publication date, page when available, document ID, and canonical URL. Never invent a page number.

## Known gaps
- 2022-08-18-supporting-document-final-engagement-summary-report-17f34e5a: unreviewed; historical. Verify before relying on content-specific claims.
- 2021-05-12-supporting-document-electricity-distributors-association-9765a791: unreviewed; historical. Verify before relying on content-specific claims.

## Requested depth
Give a practical, structured analysis suitable for daily program work. Distinguish confirmed design, history, stakeholder feedback, and open questions.

## Answer format
1. Direct answer
2. Confirmed ERP design
3. Historical or stakeholder context
4. Phase 1 implications
5. Open questions and evidence gaps
6. Source list

Work only from the selected evidence. If the evidence is insufficient, say exactly what is missing.

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