Quick Answer
Illinois is one of the best Midwest states for solar thanks to the Illinois Shines program, which provides $6,000-$12,000+ upfront. Combined with full 1:1 net metering and property/sales tax exemptions, payback periods of 7-10 years are achievable. ComEd territory (Chicago) offers higher incentives than Ameren (downstate).
Illinois Solar Overview
From my experience:
Illinois Shines is one of those programs that makes me excited to talk about Midwest solar. People assume solar does not work here because of the weather, but that upfront SREC payment can knock $6,000-$12,000 off your system cost immediately. Combined with full net metering and those ComEd rates in Chicago, Illinois actually competes with Sun Belt states for payback period. Do not sleep on Illinois solar—it is seriously underrated.
Illinois might not be the first state you think of for solar, but don't let that fool you. The state's Illinois Shines program (formerly Illinois Solar for All) provides substantial incentives that make solar economics work even with Midwest weather.
[Editor's Note, Jan 2026]:Illinois Shines SREC payments vary by block and utility territory. ComEd blocks typically pay more than Ameren. Program funding has been strong but verify current block availability with a registered installer.
Illinois Solar Snapshot
Average system cost: $24,000-$32,000 (8 kW system)
Payback period: 7-10 years
Illinois Shines: Significant upfront SREC payment
Net metering: Full retail rate (1:1) (Source: EnergySage Marketplace Data, 2025)
Payback period: 7-10 years
Illinois Shines: Significant upfront SREC payment
Net metering: Full retail rate (1:1) (Source: EnergySage Marketplace Data, 2025)
Why Illinois Is Good for Solar
- Illinois Shines SRECs: Substantial upfront incentive payment
- Full net metering: 1:1 retail credit for excess energy
- Property tax exemption: Solar doesn't increase property taxes
- Sales tax exemption: No sales tax on solar equipment
- Growing market: Competitive installer pricing
Challenges in Illinois
- Moderate sunshine: Less sun than southern states
- Winter weather: Snow and clouds reduce winter production
- SREC complexity: Understanding the program takes effort
- No state tax credit: No income tax credit available
Solar Costs in Illinois
Average Installation Costs
| System Size | Cost Range | After Illinois Shines |
|---|---|---|
| 6 kW | $18,000-$24,000 | $12,000-$18,000 |
| 8 kW | $24,000-$32,000 | $16,000-$24,000 |
| 10 kW | $30,000-$40,000 | $20,000-$30,000 |
| 12 kW | $36,000-$48,000 | $24,000-$36,000 |
Cost Per Watt
- Illinois average: $3.00-$3.80 per watt
- Chicago metro: $3.20-$4.00 per watt
- Downstate: $2.80-$3.50 per watt
- National average: $2.75-$3.50 per watt
Illinois Solar Incentives
Federal Tax Credit (2026)
- Purchased systems: The 30% residential credit (Section 25D) ended December 31, 2025
- PPA/Lease: Section 48E still provides 30% through 2027—passed to you as lower payments
- Already installed: Systems installed before 2026 still qualify
State Incentives
- Illinois Shines (SRECs): Major incentive—see details below
- State tax credit: None available
- Property tax exemption: Solar value exempt from property tax
- Sales tax exemption: 6.25% state sales tax waived
Tax Exemptions Help
The sales tax exemption alone saves ~$1,500-$2,500 on an average system. Combined with the property tax exemption, Illinois provides meaningful non-SREC benefits. (Source: SRECTrade and state program data)
Illinois Shines Program
Illinois Shines is the state's flagship solar incentive program, providing upfront payments for the renewable energy credits (RECs) your system will produce over 15 years.
How Illinois Shines Works
- REC purchase: State buys 15 years of RECs upfront
- Lump sum payment: You receive payment at installation
- Applied to cost: Usually reduces your out-of-pocket price
- Approved vendors: Must use registered installer
Illinois Shines Payment Amounts
Payment amounts vary based on utility territory, system size, and program block:
- ComEd territory: Generally higher payments
- Ameren territory: Slightly lower payments
- Block pricing: Early blocks pay more; decreases over time
- Typical range: $6,000-$12,000+ for residential systems
Program Requirements
- Approved vendor: Installer must be Illinois Shines registered
- System size: Under 25 kW for residential
- Grid-connected: Must connect to utility grid
- New installation: Not for existing systems
Illinois Shines Value
Illinois Shines can reduce your net cost by $6,000-$12,000 or more. This is one of the most valuable state solar incentives in the country and makes Illinois surprisingly competitive despite Midwest weather. (Source: NOAA Climate Data)
Net Metering
Illinois has strong net metering rules that benefit solar homeowners.
How Illinois Net Metering Works
- 1:1 credit: Full retail rate for excess energy
- Monthly rollover: Credits carry to next month
- Annual true-up: Excess credited at avoided cost yearly
- System size: Up to 25 kW for residential
Net Metering by Utility
- ComEd: Standard net metering, monthly credits at retail
- Ameren Illinois: Standard net metering available
- Municipal utilities: Policies vary—check your utility
- Co-ops: May have different rules
Major Utilities
ComEd (Commonwealth Edison)
- Coverage: Northern Illinois, Chicago metro
- Customers: ~4 million
- Net metering: Full retail rate
- Illinois Shines: Higher incentive block
- Interconnection: Well-established process
Ameren Illinois
- Coverage: Central and Southern Illinois
- Customers: ~1.2 million
- Net metering: Standard rules apply
- Illinois Shines: Separate incentive block
- Lower rates: Than ComEd (affects savings)
Municipal Utilities
- Examples: Springfield CWLP, various others
- Policies vary: May not offer net metering
- Illinois Shines: May still qualify
- Check locally: Before assuming policies
IL-Specific Considerations
Weather and Production
- Annual production: ~1,100-1,200 kWh per kW installed
- Winter: Reduced output December-February
- Snow: Panels typically self-clear; minor losses
- Summer: Strong production June-August
Chicago Metro Considerations
- Flat roofs: Common on bungalows and two-flats
- Shading: Tall buildings and trees may affect some properties
- Permitting: Chicago has specific requirements
- Strong market: Many installer options
Downstate Considerations
- Lower costs: Installation typically cheaper
- Lower rates: Ameren rates lower than ComEd
- Fewer installers: May have fewer options
- Good sun: Southern IL gets more sunshine
Installer Selection
- Illinois Shines registration: Required for SREC incentives
- Verify status: Check installer is program-approved
- Compare quotes: Prices vary significantly
- Ask about timing: SREC block availability matters
The Bottom Line
Is Illinois Good for Solar?
Illinois is surprisingly excellent for solar:
- Illinois Shines: One of best state incentives nationally
- Full net metering: Maximizes your solar value
- Tax exemptions: Property and sales tax benefits
- 7-10 year payback: Competitive with Sun Belt states
Best Candidates for Illinois Solar
- ComEd customers: Higher rates = bigger savings
- High electricity bills: $100+/month
- Good roof: South-facing, minimal shading
- Planning to stay: 7+ years in the home
Challenges to Consider
- No federal credit for purchases: As of 2026
- Winter production dips: Expect seasonal variation
- SREC block timing: Best incentives go to early adopters
Questions to Ask Installers
- Are you registered with Illinois Shines?
- What's the current SREC block payment?
- When will my SREC payment be applied?
- What's my expected payback with all incentives?
- How does a PPA compare to purchasing now?
Questions About Going Solar in Illinois?
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