Southern Illinois Power Cooperative

What Southern Illinois Power Cooperative does

Southern Illinois Power Cooperative (SIPC) is a member-owned generation and transmission cooperative headquartered in Marion, Illinois. Founded in 1948, SIPC generates and transmits wholesale electric power to seven distribution cooperatives and one municipal utility in Illinois, ultimately serving more than 84,000 consumer members. The cooperative operates a generation fleet consisting of one coal-fired unit and two natural gas peaking units, supplemented by participation in the Prairie State Generation Company. Its transmission system spans nearly 1,100 miles of 69/138/161 kV lines with multiple electric stations and IT/OT communications networks.

SIPC's business model is structured as a cost-of-service cooperative rather than a profit-maximizing enterprise: members are cooperative owners, and rates are set to deliver reasonably-priced, reliable wholesale power. The Power Supply, Power Delivery, Environmental & Fuels, and Administration & Finance departments each support this mission. SIPC is an active member of ACES, MISO, and SERC Reliability Corporation, securing wholesale market access and grid reliability compliance. The cooperative has invested in environmental modernization, reducing sulfur dioxide emissions from coal-fired boilers by over 75% and nitrogen oxide emissions by over 70% over the last fifteen years, and maintains CCR Rule compliance documentation.

The company employs 101–250 people and operates exclusively within Illinois. Its competitive position rests on the captive member-ownership distribution model, diversified fuel mix, and embedded infrastructure assets rather than on technology differentiation or AI-driven capabilities, none of which were disclosed in the available source material.

Name

Southern Illinois Power Cooperative

Legal name

Southern Illinois Power Cooperative

Website

https://sipower.org

Company type

Private

Founded year

1948

Operating status

Operating

Headcount range

101–250 employees

Short description

Southern Illinois Power Cooperative is a member-owned generation and transmission cooperative in Marion, Illinois that supplies wholesale electricity from coal, natural gas, and Prairie State participation to seven distribution cooperatives and one municipal utility serving more than 84,000 consumers across Illinois.

Ownership category

akta.pro rank

Product category

Electric Power Generation and Transmission

NAICS

Electric Power Generation, Transmission and Distribution (2211)

SIC

Electric Services (4911)

akta.pro primary industry

Electric Cooperatives (Rural/Member-Owned Utilities) (EUADABAC)

akta.pro secondary industries

Gas-Fired Power Plant Development & IPP Ownership (Greenfield/Brownfield) (EUACABAI), Substation Systems & Integration (EPC, Engineering, Protection, Commissioning) (IMAGAAAC)

Keywords

• Wholesale power generation
• Electric transmission services
• Generation and transmission cooperative
• Coal-fired power generation
• Natural gas peaking capacity

Headquarters

HQ city

Marion

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Supply Chain, Operations, Infrastructure, Personnel, Technology or R&D

Revenue model

1. Wholesale Power Supply: As a generation and transmission cooperative, SIPC generates and transmits wholesale electricity to its member distribution cooperatives and one municipal utility. Members are cooperative owners, creating a cost-of-service based pricing model.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Southern Illinois Power Cooperative generates and transmits wholesale electric power for its member-owners. It operates a diversified generation fleet consisting of one coal-fired unit and two natural gas peaking units, participates in Prairie State Generation Company, and delivers that power across nearly 1,100 miles of 69/138/161 kV transmission lines and supporting electric stations to seven distribution cooperatives and one municipal utility in Illinois, ultimately serving more than 84,000 consumer members.

Product overview

Southern Illinois Power Cooperative (SIPC) is a generation and transmission cooperative that provides electric power to seven distribution cooperatives and one municipal in Illinois. The cooperative operates a diversified portfolio consisting of: (1) Power Supply/Generation - one coal-fired unit and two natural gas peaking units plus participation in Prairie State Generation Company; (2) Power Delivery/Transmission - nearly 1,100 miles of 69/138/161 kV transmission line with electric stations and communications infrastructure; (3) Environmental compliance services managing air, land, water, and hazardous waste regulations; and (4) Administration and Finance support functions. SIPC serves over 84,000 consumer members.

Differentiator

Problem solved

Functional benefit

Products and services

• Power Supply (Generation) Operation and maintenance of SIPC's generating fleet consisting of one coal-fired unit and two natural gas peaking units, including participation at Prairie State Generation Company, supplying wholesale power to member distribution cooperatives and one municipal utility in Illinois.
• Power Delivery (Transmission) Forecasting, scheduling, and delivering wholesale power from coal, natural gas, the wholesale power market, and renewables. The system consists of nearly 1,100 miles of 69/138/161 kV transmission line, multiple electric stations, and IT/OT communications networks, serving more than 84,000 consumer members across seven distribution cooperatives and one municipal.
• Administration and Finance Services Internal cooperative support services including General Accounting, Fixed Asset Accounting, Fuel Accounting, Accounts Payable, Purchasing, Payroll, Budgeting, Insurance, Finance, and Treasury, supporting the operation of the generation and transmission business.
• Environmental and Fuels Services Management of the company's compliance with all environmental laws and regulations, including air, land, water, and hazardous waste. Achieved over 75% reduction in sulfur dioxide emissions and over 70% reduction in nitrogen oxide emissions from coal-fired boilers over the last fifteen years.

Quantifiable outcome

• Sulfur dioxide emissions reduced over 75% from coal-fired boilers over 15 years
• +1 more outcomes

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Four partnerships are on record, tiered core.

• ACEScoreTechnology or IntegrationActive member of ACES (Association of Cooperative Executives), a consortium of generation and transmission cooperatives that provides power supply services and market access.
• Mid-continent Independent System Operator (MISO)coreTechnology or IntegrationActive member of MISO, which manages the electric grid and wholesale power market across multiple states, providing market access and grid reliability services.
• SERC Reliability CorporationcoreTechnology or IntegrationActive member of SERC Reliability Corporation, which provides reliability compliance and engineering services for the bulk electric system.
• Prairie State Generation CompanycoreStrategic or Co-development PartnerSIPC participates in Prairie State Generation Company, which operates a coal-fired power plant. This partnership provides access to additional generation capacity and diversified fuel sources.

Scale indicators5 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• Basin Electric Power Cooperative: One of the largest generation and transmission cooperatives in the U.S., serving member cooperatives across multiple states with a diversified coal, gas, and renewables portfolio — directly comparable to SIPC's G&T cooperative model.
• Dairyland Power Cooperative: Wisconsin-based generation and transmission cooperative serving member distribution co-ops with a coal/gas/renewable portfolio — comparable cooperative structure, member-ownership, and MISO-adjacent wholesale operations.
• Associated Electric Cooperative: Missouri-based G&T cooperative serving member distribution cooperatives across multiple states with a mix of coal, gas, and renewable generation — closely mirrors SIPC's wholesale cooperative business model.
• Golden Spread Electric Cooperative: Texas-based generation and transmission cooperative serving distribution co-op members with owned generation and transmission assets — another G&T cooperative peer with shared cooperative governance and wholesale supply model.
• Corn Belt Power Cooperative: Iowa-based generation and transmission cooperative serving member distribution co-ops with overlapping MISO market participation — a closely comparable G&T peer in scale and member-owned structure.
• Seminole Electric Cooperative: Florida-based generation and transmission cooperative supplying wholesale power to distribution cooperative members — a near-direct analog in structure, GTM motion, and member-owned value proposition.
• Hoosier Energy Power Network: Indiana-based generation and transmission cooperative serving member distribution co-ops in Illinois-adjacent territory with overlapping MISO market exposure — a strong functional and regional peer.
• East Kentucky Power Cooperative: Kentucky-based G&T cooperative supplying wholesale power and transmission services to member distribution co-ops — a structural peer operating in an adjacent region with similar cooperative governance.

Regional players

• Ameren Illinois: Investor-owned regulated electric utility serving the same Illinois territory as SIPC's members — a regional peer in the same geographic market but operating under a different (IOU) ownership and regulatory structure.

Others

• ACES (Association of Cooperative Executives): Consortium of generation and transmission cooperatives that provides power supply services and market access; SIPC is a member, making ACES a strategic partner that also competes for shared services and resource coordination among G&T cooperatives.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Southern Illinois Power Cooperative