Documentation on interconnecting a large industrial load or a generator to the SIPC transmission system or an SIPC member/owner distribution system is provided below.

For generation <40 kW in size, the Interconnection Customer (IC) should communicate directly with the SIPC member/owner distribution utility that the project resides with.

Clay Electric Cooperative
Clinton County Electric Cooperative
Egyptian Electric Cooperative
Monroe County Electric Cooperative
Southeastern Illinois Electric Cooperative
Southern Illinois Electric Cooperative
Tri-county Electric Cooperative

For generation interconnections >5 MW or connecting to ≥34.5 kV, the IC should proceed through the Midcontinent Independent System Operator, Inc (MISO) Definitive Planning Phase (DPP) process.

New Load Connections

For new large, industrial loads, applicants will initially communicate directly with SIPC member/owner distribution utilities. Information on the process and data that may be requested is here.

Generation Interconnection Requests connecting to ≤ 12.5 kV or ≥ 40 kW

For generation interconnections ≥40 kW in size and connecting to ≤12.5 kV, the IC shall submit an application and a non-refundable application fee of $5,000 directly to SIPC. The application fee will be used towards the review and processing of the application, any required studies, and the equipment needed for metering and system protection requirements. Actual costs are paid for by the IC and these costs can exceed $5,000. In the event these costs are less than the application fee, a refund for the difference between the application fee and the actual costs will be provided to the IC. Following are links to SIPC’s Generation Interconnection Process Flow Chart, Generation Interconnection Request Application, Engineering Studies for Generation Interconnection Process, and Generation Interconnection Protection Requirements:

SIPC Generation Interconnection Process Flow Chart
SIPC Generation Interconnection Request Application
SIPC Engineering Studies for Generation Interconnection Process
SIPC Generation Interconnection Protection Requirements

SIPC will assess a non-refundable $1,000/MW/month fee to hold a queue position if a Small Generator Interconnection Agreement (SGIA) has not been fully executed within the specified timelines of the SIPC Engineering Studies for Generation Interconnection Process document and the IC wishes to stay in the queue.

All application fees will be applied to the total interconnection cost if an SGIA is fully executed.

For generation ≤5 MW, SIPC offers avoided costs to the IC for excess generation beyond the usage metered in each billing cycle. An executed Power Purchase Agreement is required before excess generation payments can begin.

Any IC project that is found to produce back feed on a MISO Transferred Transmission Facility (Appendix G) will be required to have a MISO Affected System Study performed at the expense of the IC.

Generation Interconnections Requests connecting to > 12.5 kV or > 5 MW

For generation interconnections >5 MW in size and connecting to ≥34.5 kV, the IC shall proceed through the MISO DPP process, which can be found here.

Information on SIPC’s Transferred Transmission Facilities (Appendix H and G) with MISO can be found here

MISO will establish communication to SIPC regarding the application.

SIPC’s Facility Interconnection Requirements for all interconnections can be found here.