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πŸ“‹ Case Study

CAISO Pilot: 500-MW Residential DER Aggregation Program

Heterogeneous DER mix (120k rooftop PV, 28k smart thermostats, 15k EVSE) with inconsistent comms, low observability, and lack of standardized bidding interfaces

πŸ—οΈ Project Overview

California ISO’s first FERC Order 2222-compliant residential VPP pilot across 3 utilities

🎯 Challenge

Heterogeneous DER mix (120k rooftop PV, 28k smart thermostats, 15k EVSE) with inconsistent comms, low observability, and lack of standardized bidding interfaces

πŸ”§ Design Approach

Federated edge architecture with local optimization engines (on-premises at utility substation level), cloud-based market bidding layer, and OpenADR 2.0b + IEEE 2030.5 hybrid gateway stack

πŸ“ Design Diagram

PV
120kThermostats
28kEVSE
15kEdge Optimizer(Substation)Cloud BiddingISO RTM InterfaceOpenADR 2.0b +IEEE 2030.5 GatewayLatency Budget:4 sec (3.2 used)CAISO Pilot: 500-MW Residential DER AggregationAggregation Headroom: 217 MWDesign: Federated Edge Architecture

AI-generated project design illustration

πŸ“ Key Calculations

Aggregation Headroom

Sum(Dispatchable kW Γ— Availability Factor) βˆ’ Baseline Load
Result: 217 MW
Defines bid-capable capacity

Latency Budget

Device β†’ Edge β†’ Cloud β†’ ISO RTM < 4 sec
Result: 3.2 sec
Meets CAISO RTM requirements

πŸ“Š Results

Achieved 92% dispatch accuracy over 6-month trial; $18.4M in ancillary service revenue; 100% FERC 2222 interconnection approval

πŸ’‘ Lessons Learned

  • β€’Edge-local forecasting reduced forecast error by 37%
  • β€’OpenADR-only deployments failed on EVSE coordination due to missing V2G semantics
  • β€’Utility-specific CIM extensions were required for DSO interface

βœ… Key Takeaways

  • 1Edge-local forecasting reduced forecast error by 37%
  • 2OpenADR-only deployments failed on EVSE coordination due to missing V2G semantics
  • 3Utility-specific CIM extensions were required for DSO interface