ComEd - Interconnection Guidelines (Illinois)
Last modified on May 23, 2011.
Rules Regulations Policies Program
|Name||ComEd - Interconnection Guidelines|
|Applicable Sector||Commercial, Industrial, Residential|
|Eligible Technologies||Solar Thermal Electric, Photovoltaics, Landfill Gas, Wind, Biomass, Hydroelectric, Geothermal Electric, Fuel Cells, Municipal Solid Waste, CHP/Cogeneration, Microturbines, Other Distributed Generation Technologies|
|Energy Category||Renewable Energy Incentive Programs|
|External Disconnect Switch||Yes (for systems < 40 kW)|
|Net Metering Required||Yes|
|System Capacity Limit|| No size limit for DG rules; 25 kW or 40 kW for net-metered systems /
|Date added to DSIRE||2003-06-18|
|Last DSIRE Review||2008-04-01|
Illinois does not have statewide interconnection standards in place for distributed generation (DG), but the Illinois Commerce Commission (ICC) is now in the process of developing rules. Individual utility rules are in place to address the interconnection of small-scale DG. The state's largest electric utility, ComEd, has interconnection guidelines for net metering and DG.
ComEd's DG rules divide systems into three capacity categories: 25 kVA to 2.5 MVA; 2.5 MVA to 10 MVA; and systems larger than 10 MVA. In general, customer-generators are responsible for all interconnection study charges, and systems must be an eligible qualifying facility (QF) under the Public Utility Regulatory Policies Act of 1978 (PURPA) to receive any payment for power sent to utility. Significantly, there is an exception for net-metered photovoltaic (PV) and wind-energy systems with a capacity less than 40 kilowatts (kW); these systems are not required to file to become a QF. All small systems up to 25 kVA (and net-metered PV and wind systems up to 40 kVA) require a manual, lockable disconnect switch accessible to the utility. However, special interconnection relays are not required.
The difference in interconnection requirements for systems in the three capacity categories involves specific relay standards. Procedurally, all systems require a series of reviews by ComEd engineering staff. ComEd does not allow interconnection within "The Loop," an area network that serves the heart of downtown Chicago. As a result, DG systems that could be used as back-up generation for downtown high rises are unable to interconnect.
|Contact Name||Maryl Freestone|
|Address||ESO Tech. Services, 2nd Fl|
|Address 2||Three Lincoln Centre|
|Place||Oakbrook Terrace, Illinois|
- Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.