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Illinois · Chicago

Chicago solar in 2026

Written by the Solar Learning Lab research deskUpdated August 21, 202611 min read

Chicago has practical permits and a new-project export rule that is not full retail.

Reference production: 1316.6 kWh per kW per year. Every utility claim below is linked to the local record.

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What changes the Chicago math

Qualifying rooftop arrays under 13.44 kW can use Chicago Easy Permit Process: $275, same-day approval, and a one-day timeline instead of the prior 30-day path. epp source But ComEd customers interconnected on or after January 1, 2025 receive Supply-only credits. Legacy systems offset Supply, Delivery, and Taxes & Fees for 30 years. New proposal math must use the new rule. faq source

Chicago DOB EPP covers inverter output at or below 13.44 kW and lets applicants forgo dedicated zoning review. A licensed architect or structural engineer must prepare drawings. guide source Storage may be up to 20 kWh with a lower limit for certain chemistries, and panel output may not exceed 155% of inverter output. Larger systems use Standard Plan Review. rules source SolarAPP+ adoption is not confirmed in this research.

ComEd Rider POGNM governs eligible customer generation. New residential and small-load customers under 100 kW offset Supply only, and customer and meter charges remain. Credits may be kWh or monetary and do not expire for post-2025 customers. net source faq source Current all-in ComEd residential tariff is n.a. from the research, so the calculator uses Illinois EIA average rather than fabricating a Chicago bill.

ComEd DG Rebate pays $300 per kW generation and $300 per kWh storage for qualifying residential systems. Electing the generation rebate forfeits legacy full-retail net-metering status; the storage rebate does not. rebate source Illinois Shines 2026-27 0 to 10 kW AC REC prices are $70.37 Group A and $80.77 Group B per REC. shines source Illinois Solar for All says no upfront cost for eligible 1 to 4-unit buildings, but its single-family capacity reached limit in 2025. ilsfa source 25D ended December 31, 2025; lease and PPA providers may claim 48E. federal source

The city PVGIS run produces 1,316.6 kWh per kW per year. July is 149.6 and December 51.7. Winter production is a real design feature, not a footnote. pvgis source O’Hare normals show 49.9°F and 36.89 inches of precipitation. ACS lists 1,146,547 households, 45.5% owner occupancy and 29.2% single-family homes. climate source census source Chicago says its City buildings are sourced by 100% renewable energy and it aims for citywide clean renewable electricity by 2035. That is municipal context, not a household rebate. chi100 source

A decision should begin with the utility rule, then move to physical design. For Chicago, put twelve months of bills beside a proposed annual output of 1316.6 kWh per kW. Separate the kWh you expect to use at home from the kWh you expect to export. The first number is a bill-offset question. The second is a tariff question. Do not treat them as interchangeable. PVGIS method.

Then audit the scope. A useful proposal names permitting, engineering, interconnection, roof work, service-panel work, monitoring, meter work, inspections, and every contingency. If a number cannot be documented before signature, label it as an allowance. That is especially important where the public fee schedule does not publish a flat all-in PV permit amount. The right response to an unknown is n.a., followed by the question that will resolve it.

Finally, plan for the calendar rather than a brochure. A production forecast of 64.5 kWh per kW in January and 149.6 in July means monthly bill behavior will change. The model is deliberately conservative about certainty: it does not know the roof shade, the roof condition, the household schedule, the contract rate, or future utility action. That restraint is useful. It keeps a planning page from becoming a pretend quote.

Permit and interconnection checklist

City permitting and utility permission to operate are separate approvals. Get both dates, each responsible party, and the fee assumptions in writing. The cited city material controls if a sales statement conflicts with this page.

Before final design, confirm roof condition, structural scope, electrical service, ownership or association approval, and the exact account holder. None of those project facts can be inferred from a city average.

Rate and export value

Energy sourceTypeAverage priceWhat that means
Local planning inputElectricity23.85¢ per kWhVerified city research input or transparent state planning input.
Rooftop solarElectricityVariable by on-site use and export ruleSolar used on site and solar exported are not automatically worth the same amount.

See the cited local utility materials above.

Incentive discipline

Do not subtract any credit, rebate, or REC payment until eligibility, timing, ownership, and program capacity are confirmed. The source-linked claims above are what was verified on August 21, 2026.

Monthly production, not an annual slogan

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

The highlighted month is highest in the reference run. Your roof will differ.

PVGIS v5.2. PVGIS v5.2 model run by Solar Learning Lab on August 21, 2026, NSRDB radiation database. Fixed south facing mount, 30 degree tilt, 14 percent losses, downtown Chicago coordinates. Your roof will differ.

Chicago solar after the net-metering change

Chicago’s Easy Permit Process is a real local advantage for a bounded project. For inverter output under 13.44 kW, the City reduced the permit fee from $375 to $275, says approvals are same day, and describes the timeline as one day rather than 30. A qualifying applicant may forgo dedicated zoning review. The threshold is not a panel-count rule: it is the inverter-output ceiling associated with a 70-amp breaker per roof. Larger projects go to Standard Plan Review. This is the kind of permit detail that should be checked before a salesperson calls a system “standard.” Chicago Easy Permit Process and Chicago PV guidelines.

The EPP route still has technical boundaries. The City requires drawings by a licensed architect or structural engineer. Total PV panel output may not exceed 155% of inverter output. Energy storage can be up to 20 kWh, with a 10 kWh limit for some battery chemistries. The City’s solar express instructions tie those requirements to the Chicago Construction Codes. A permit route is helpful, but it does not replace structural design, electrical coordination, or ComEd inspection. The research does not confirm city adoption of SolarAPP+, so “same day EPP” and “automated instant approval” should not be treated as the same claim. Chicago solar express instructions.

ComEd’s January 1, 2025 line is the dominant new-project economics change. A system interconnected by December 31, 2024 keeps full retail net metering for the system life, defined by the FAQ as 30 years, and credits supply, delivery, and taxes and fees. A residential or small-load system under 100 kW that is new as of January 1, 2025 receives credits against the Supply section only. Customer and meter charges are not offset. Two houses with similar roofs can therefore have a different value for a noon export because their interconnection date is different. ComEd 2025 net-metering FAQ.

Post-2025 customers may choose kWh or monetary credits, and ComEd says those credits do not expire. Legacy fixed-price kWh credits reset annually in April or October. That is a material distinction from the old full-retail framework, but it is not a reason to abandon accurate load matching. A household that uses more of its output avoids a supply purchase directly; a household that expects large exports needs a current supply-only calculation. The research did not verify a current all-in ComEd residential tariff, which is why this page uses the Illinois EIA average as a transparent planning input and marks the local all-in tariff n.a. ComEd net metering and ComEd credit mechanics.

The ComEd Distributed Generation Rebate is valuable precisely because it has a catch. Residential and Small C&I generation receives $300 per kW, and storage receives $300 per kWh, for eligible smart-inverter facilities interconnected after August 11, 2022. Taking the generation rebate forfeits legacy full-retail net-metering status. The storage rebate does not. The correct comparison depends on whether the household has legacy status to lose. It is wrong to show the $300 per kW as a no-strings discount without putting the changed net-metering treatment on the same worksheet. ComEd DG Rebate terms and conditions.

Illinois Shines provides REC pricing rather than a simple percentage tax credit. In Program Year 2026-27, the distributed-generation price for 0 to 10 kW AC is $70.37 per REC in Group A and $80.77 in Group B. The next 10 to 25 kW tier is $60.92 and $79.21. The program uses Approved Vendors and its payment mechanics need to be explained in a proposal, including the system size, group, REC quantity, payment schedule, and ownership terms. A per-REC price cannot be converted to a homeowner check without those additional project facts. Illinois Shines Program Year 2026-27 presentation.

Illinois Solar for All is a distinct income-eligible program. It offers no-upfront-cost solar for 1 to 4-unit buildings under its eligibility rules. A single-family owner must be at or below 80% AMI; a two-to-four-unit building needs at least two income-eligible units, and a five-plus-unit building needs at least half. Program material says single-family and two-to-four-unit capacity was reached in 2025, with more 2026 funding expected. “Expected” is not an open reservation or an approval. Its 15-year routine maintenance statement and 14-day cancellation period are consumer-protection details worth comparing with a standard retail contract. Illinois Solar for All residential program.

Chicago’s winter production profile is visible in the reference run. The annual figure is 1,316.6 kWh per kW, July reaches 149.6, and December is 51.7. O’Hare normals show 49.9°F annual mean temperature and 36.89 inches of precipitation. Snow-bearing winter conditions make the engineering conversation different from Florida or Hawaii, particularly for roof access and the seasonal bill shape. They do not permit this page to invent a snow-loss percentage for an individual roof. The ACS profile has 1,146,547 households, 45.5% owner occupancy, and 29.2% single-family housing, which makes multi-unit governance and shared-roof questions a central practical constraint. NOAA climate normals, PVGIS, and ACS 2023 Census data.

Chicago Chicago permit and supply-credit comparison

These listings are not endorsements. A Chicago contract should identify the inverter-output permit lane, structural drawings, post-2025 supply-only treatment, REC group, and whether a generation rebate affects legacy status.

Ratings snapshot: Google Maps, August 2026, via the DataForSEO SERP feed. Zero companies paid us and none are endorsed by us.

Kaizan

4.9(266 Google reviews)

WindSoleil

Chicago

4.9(69 Google reviews)

The Solar Soldier

Chicago

5.0(19 Google reviews)

RxSun

Chicago

4.8(136 Google reviews)

Ailey Solar

Chicago

4.8(63 Google reviews)

FreeWorld Electric & Solar

Chicago

4.8(60 Google reviews)

Quality Solar, LLC

Chicago

4.7(26 Google reviews)

Windfree Solar Co

Chicago

4.6(117 Google reviews)

Ratings and review counts are Google Maps ratings for Chicago local results, retrieved August 17, 2026 via the DataForSEO SERP API. We list the highest rated established companies we found. No company paid to appear here, and appearing here is not an endorsement. Check current reviews and licensing before you sign anything.

Chicago permit and supply-credit comparison

$110
1,317

This city run is a fixed south-facing reference, not a roof-specific shade study.

$2.99

Cash quotes in Chicago cluster near $2.99 per watt, against a $3.50 national 2024 median (LBNL). Use your quote.

Assumptions you can change
2.5%
7%
15
24c

Use the rate on your actual lease or PPA quote. There is no published statewide average we trust enough to hardcode.

2%
Estimated system: 4.2 kWAnnual usage: 5,535 kWhState credit: $0

Cash purchase

$12,558 after state credit

Year 1 benefit
$110/mo
Payback
9 years
20 year net position
$19,446

Local utility export terms may differ from retail consumption value. Read the city page before treating savings as a quote.

Solar loan

$158/mo 15 yr payment

Year 1 net
-$48/mo
Upfront
$0
20 year net position
$3,533

Loan cost and dealer fees vary by offer.

Lease / PPA

$0 down you buy the power

Year 1 net
-$1/mo
Upfront
$0
20 year net position
$1,346

A lease or PPA provider may claim federal 48E; compare contract escalation and export mechanics.

Estimates, not quotes. We are a solar installer and we also partner with other solar companies. See our disclosures.

Chicago questions after the 2025 rule change

What does a new ComEd customer’s credit offset?
The 2025 FAQ says new residential and small-load systems under 100 kW offset the Supply section only.
Can a generation DG Rebate preserve legacy full retail status?
No. The ComEd terms say taking the generation rebate forfeits that legacy treatment.
What makes a roof eligible for Easy Permit Process?
The inverter output must be at or below 13.44 kW and the City requirements for drawings and design must be met.
Why do Illinois Shines dollar claims vary?
REC price depends on system-size tier and utility group, so a generic per-system check is not verified.
Does winter eliminate Chicago solar production?
No. The PVGIS run shows winter output is lower, while July is the annual high month.

Chicago source-by-source evidence register

This extended register preserves the supplied local research in short audit notes. Each note is anchored to a city research URL retained in this page’s source map.

  1. Chicago evidence note 001: Chicago, IL : residential solar research Permits and AHJ - AHJ : City of Chicago Department of Buildings research citation.
  2. Chicago evidence note 002: (DOB) . - Easy Permit Process (EPP) for small rooftop PV : for systems under 13.44 kW , research citation.
  3. Chicago evidence note 003: the City reduced the permit fee from $375 to $275 (a 25% reduction), offers same-day permit approvals , research citation.
  4. Chicago evidence note 004: and reduced the timeline from 30 days to one day ; applicants may forgo dedicated zoning review. Installers research citation.
  5. Chicago evidence note 005: must also apply to and be inspected by ComEd. ( City of Chicago, small installations and the Easy research citation.
  6. Chicago evidence note 006: Permit Process ( - Fees : EPP fee $275 ; Standard Plan Review fee $375 . EPP is research citation.
  7. Chicago evidence note 007: limited to inverter output 13.44 kW (the maximum for a 70-amp breaker per roof); larger systems go to research citation.
  8. Chicago evidence note 008: Standard Plan Review. The EPP desk is at City Hall, 121 N. LaSalle, 9th floor, 312-744-8678. Plan review research citation.
  9. Chicago evidence note 009: submissions run through DOB E-Plan / ProjectDox . An Aldermanic Letter of Support can waive the 10-day waiting research citation.
  10. Chicago evidence note 010: period. ( Chicago Photovoltaic Guidelines PDF ( - Express Permit Program terms for solar : inverter output 13.44 research citation.
  11. Chicago evidence note 011: kW with drawings by a licensed architect or structural engineer; energy storage up to 20 kWh (10 kWh research citation.
  12. Chicago evidence note 012: limit for some battery chemistries); total PV panel output 155% of inverter output; cites Chicago Construction Codes 14A-12-1204.2. research citation.
  13. Chicago evidence note 013: ( Chicago solar express permit instructions ( see also DOB green permits ( - SolarAPP : not confirmed research citation.
  14. Chicago evidence note 014: adopted by the City of Chicago : n.a. Statewide, the Illinois Finance Authority (Climate Bank) issued a second research citation.
  15. Chicago evidence note 015: NOFO on 07/02/2025 offering up to 9 grants of up to $30,000 each to Illinois municipalities to adopt research citation.
  16. Chicago evidence note 016: SolarAPP , which automates plan review and issues instant compliance approvals but does not cover utility interconnection. ( research citation.
  17. Chicago evidence note 017: Illinois APA notice of the IFA SolarAPP NOFO ( - Pending state mandate : HB3265, the Residential Automated research citation.
  18. Chicago evidence note 018: Solar Permitting Platform Act (104th General Assembly, as introduced) would require municipalities over 5,000 residents and all counties, research citation.
  19. Chicago evidence note 019: on or before July 1, 2026 , to adopt a platform that automates plan review, produces code-compliant approvals, research citation.
  20. Chicago evidence note 020: accepts online fee payment, and instantly issues permits and permit revisions for residential PV up to the maximum research citation.
  21. Chicago evidence note 021: capacity allowed with a 200-amp main service disconnect, including storage, main panel upgrades, or breaker derates. It would research citation.
  22. Chicago evidence note 022: bar manual review for platform-approved systems, require remote inspection options at no greater cost or delay, limit inspections research citation.
  23. Chicago evidence note 023: to one unless the first fails, and mandate compliance reports within 60 days and annual usage reports each research citation.
  24. Chicago evidence note 024: April 1 starting 2027. Enforcement includes private civil actions recovering up to 50% of installation cost plus fees. research citation.
  25. Chicago evidence note 025: ( HB3265 full text, ilga.gov ( Enactment status: n.a. (not verified on a fetched primary status page). - research citation.
  26. Chicago evidence note 026: Review timeline : EPP one day / same-day approval for qualifying small PV; Standard Plan Review timeline n.a. research citation.
  27. Chicago evidence note 027: ( EPP page ( Utility and rates - Utility : ComEd (delivery); supply may be ComEd default or research citation.
  28. Chicago evidence note 028: a retail supplier. - Export program : Net Metering under Rider POGNM : Parallel Operation of Retail Customer research citation.
  29. Chicago evidence note 029: Generating Facilities with Net Metering , for eligible renewable generators on the customer's premises. ( ComEd net metering research citation.
  30. Chicago evidence note 030: ( - Mechanics, and the key 2025 cliff : customers interconnected by December 31, 2024 keep full retail research citation.
  31. Chicago evidence note 031: rate net metering for the life of the system ( 30 years ), with credits offsetting Supply, Delivery, research citation.
  32. Chicago evidence note 032: and Taxes Fees. New customers as of January 1, 2025 (Residential/Small Load, under 100 kW) receive credits that research citation.
  33. Chicago evidence note 033: offset the Supply section only . Customers may elect kWh or monetary credits; credits for post-January-1-2025 customers do research citation.
  34. Chicago evidence note 034: not expire , while legacy fixed-pricing kWh credits expire/reset annually in April or October. Customer charge and meter research citation.
  35. Chicago evidence note 035: charges are unaffected by net metering. Participation begins at Permission to Operate (PTO) . ( ComEd Net Metering research citation.
  36. Chicago evidence note 036: FAQ 2025 PDF ( - Residential tariff name and current per-kWh/fixed charge values : n.a. (not verified from research citation.
  37. Chicago evidence note 037: a fetched ComEd rate sheet in this session). - Related : ComEd markets hourly pricing to solar customers research citation.
  38. Chicago evidence note 038: ( ComEd hourly pricing for solar ( and has filed a Virtual Power Plant rider ( Rider VPP research citation.
  39. Chicago evidence note 039: advance copy PDF ( Local incentives - ComEd Distributed Generation Rebate (Rider DG REBATE) , effective December 15, research citation.
  40. Chicago evidence note 040: 2022 under PUA 16-107.6: $300 per kW of generation and $300 per kWh of storage for residential and research citation.
  41. Chicago evidence note 041: Small C I (other commercial $250/kW and $250/kWh). Facility must be 5,000 kW and interconnected after August 11, research citation.
  42. Chicago evidence note 042: 2022 using a smart inverter. Storage customers must take supply under Rate BESH for the life of the research citation.
  43. Chicago evidence note 043: facility. Electing the generation rebate forfeits full-retail-rate legacy net metering status ; the storage rebate does not. ( research citation.
  44. Chicago evidence note 044: ComEd DG Rebate terms and conditions PDF ( - Illinois Shines (Adjustable Block Program) : REC payments, Program research citation.
  45. Chicago evidence note 045: Year 2026-27 , which opened June 1, 2026 with prices announced April 17, 2026 in the Program Guidebook. research citation.
  46. Chicago evidence note 046: Distributed Generation REC prices per REC: 0 10 kW AC $70.37 (Group A) / $80.77 (Group B) ; research citation.
  47. Chicago evidence note 047: 10 25 kW $60.92 / $79.21; 25 100 kW $59.53 / $69.65; 100 200 kW $55.63 / $65.09; research citation.
  48. Chicago evidence note 048: 200 500 kW $45.64 / $53.40; 500 2,000 kW $42.37 / $49.57; 2,000 10,000 kW $33.99 / $39.98. research citation.
  49. Chicago evidence note 049: ( Illinois Shines PY2026-27 welcome webinar PDF ( price documents index: Illinois Shines program documents ( program year research citation.
  50. Chicago evidence note 050: page: welcome to PY2026-27 ( block capacity: project status and capacity dashboard ( - Prior-year comparison for trend: research citation.
  51. Chicago evidence note 051: PY2025-26 small DG 0 10 kW was $66.34 (Group A) / $75.48 (Group B) and 10 25 kW research citation.
  52. Chicago evidence note 052: $57.18 / $69.78 . ( Illinois Power Agency REC prices, April 2025 PDF ( The IPA's 2026 Long-Term research citation.
  53. Chicago evidence note 053: Plan Appendix D discusses a proposed $20/REC adder for customer-owned Small DG . ( IPA Appendix D PDF research citation.
  54. Chicago evidence note 054: ( - Illinois Solar for All (ILSFA) for income-eligible households: no upfront cost for 1 4 unit buildings; research citation.
  55. Chicago evidence note 055: single-family owners must be at or below 80% AMI ; 2 4 unit buildings need at least two research citation.
  56. Chicago evidence note 056: income-eligible units; 5 unit buildings need at least half. Participants get a 14-day cancellation window and no-cost routine research citation.
  57. Chicago evidence note 057: maintenance for 15 years on residential rooftop and ground-mount projects. ILSFA reached capacity for single-family and 2 4 research citation.
  58. Chicago evidence note 058: unit projects in 2025 , with more funding expected in 2026 . ( Illinois Solar for All residential research citation.
  59. Chicago evidence note 059: solar ( income thresholds: 2026-2027 AMI thresholds ( - City of Chicago cash rebate for residential solar : research citation.
  60. Chicago evidence note 060: n.a. (none found on chicago.gov pages fetched); Chicago's lever is the reduced-fee, same-day Easy Permit Process. City texture research citation.
  61. Chicago evidence note 061: 1. Climate normals (1991 2020) : Chicago O'Hare (USW00094846) annual normal mean temperature 49.9 F , annual normal research citation.
  62. Chicago evidence note 062: precipitation 36.89 in : the coldest and driest-but-snow-bearing of the five, which is why winter production and snow-shedding research citation.
  63. Chicago evidence note 063: tilt matter here in a way they do not in Florida or Hawaii. ( NOAA NCEI normals API research citation.
  64. Chicago evidence note 064: ( 2. Two-tier net metering created a hard January 1, 2025 line : systems live by December 31, research citation.
  65. Chicago evidence note 065: 2024 offset supply, delivery, and taxes for 30 years; anything interconnected after offsets supply only , which materially research citation.
  66. Chicago evidence note 066: lowers the value per exported kWh in the same neighborhood. ( ComEd Net Metering FAQ 2025 ( 3. research citation.
  67. Chicago evidence note 067: Incentive stacking has an explicit conflict : taking the ComEd $300/kW generation DG rebate forfeits legacy full-retail net research citation.
  68. Chicago evidence note 068: metering, while the $300/kWh storage rebate does not : so the correct play depends on the customer's interconnection research citation.
  69. Chicago evidence note 069: date. ( ComEd DG Rebate terms ( 4. City renewable commitment : as of January 1, 2025 the research citation.
  70. Chicago evidence note 070: City of Chicago states all City buildings, including O'Hare and the Harold Washington Library, are sourced by 100% research citation.
  71. Chicago evidence note 071: renewable energy , with a goal that all electricity consumed in Chicago come from clean renewable sources by research citation.
  72. Chicago evidence note 072: 2035 . The City unveiled its first two Library Solar rooftop projects (Humboldt Park and South Chicago branches) research citation.
  73. Chicago evidence note 073: in July 2025 . ( Chi100 ( The 2022 draft Climate Action Plan documents the underlying 2019 commitment research citation.
  74. Chicago evidence note 074: of 100% renewable municipal energy by 2025 and city-wide by 2035. ( Chicago 2022 draft CAP PDF ( research citation.
  75. Chicago evidence note 075: 5. Permitting friction is a documented statewide issue driving legislation : HB3265 / SB2395 (the Residential Automated Solar research citation.
  76. Chicago evidence note 076: Permitting Platform Act) were introduced to force instant automated permitting statewide by July 1, 2026. ( HB3265 text research citation.
  77. Chicago evidence note 077: ( pv magazine USA coverage of SB2395/HB3265 ( Chicago Tribune on Illinois solar permitting ( 6. Illinois solar research citation.
  78. Chicago evidence note 078: rights / HOA law (765 ILCS 165, Homeowners' Energy Policy Statement Act) : not verified. The ilga.gov ILCS research citation.
  79. Chicago evidence note 079: page returned a fetcher error, so this is marked n.a. rather than asserted from memory. Sources - - research citation.
  80. Chicago evidence note 080: - - - - - - - - - - - - - - - - - - research citation.

Chicago post-2025 solar economics checklist

These local checks turn the supplied permit and utility record into a proposal-review sequence. They are not a savings guarantee or an equipment recommendation.

Ask the date before discussing export value

ComEd’s current rule splits customers at December 31, 2024. A system interconnected by that date keeps full retail net metering for the life of the system, stated as 30 years, and can offset supply, delivery, and taxes and fees. A customer beginning on January 1, 2025 or later receives a credit that offsets the Supply section only. Those are radically different products. Source.

Do not call supply-only credits retail net metering

The new under-100-kW Residential and Small Load credit does not erase the delivery portion or taxes and fees. Customer charges and meter charges are unaffected as well. Saying that a newly interconnected Chicago array eliminates a full electric bill is not supported by the supplied ComEd materials. The correct framing is that it can offset supply under the current rule. Source.

Choose a credit form consciously

Post-January-1-2025 customers may choose kWh credits or monetary credits, and those credits do not expire. Legacy fixed-pricing kWh credits reset annually in April or October. The non-expiring feature is useful, but it does not turn the new supply-only credit into the older full-retail structure. A model must first identify which cohort it is calculating. Source.

Permission to Operate is the starting line

The supplied FAQ says participation begins at Permission to Operate. That is why an installer should not count the most favorable program treatment from a contract signature date, delivery date, or panel installation date. Interconnection status is a utility event with economic consequences. Source.

The DG generation rebate has a real catch

ComEd’s Distributed Generation Rebate pays $300 per kW of generation for residential and Small C and I facilities, provided the stated eligibility conditions are met. Electing that generation payment forfeits full-retail-rate legacy net-metering status. A legacy customer should compare the value of keeping their tariff treatment with the rebate, rather than treating the $300 figure as free money. Source.

Storage uses a separate rule

The same Rider DG Rebate lists $300 per kWh of storage for residential and Small C and I. The supplied terms say taking the storage rebate does not forfeit legacy full-retail net metering, unlike the generation rebate. Storage participants must take supply under Rate BESH for the life of the facility. The quote needs to describe that rate obligation, not just the rebate. Source.

Use the Easy Permit threshold as a design checkpoint

Chicago’s Easy Permit Process applies to systems with inverter output of 13.44 kW or less. The City lists a $275 EPP fee, compared with $375 for Standard Plan Review, and says qualifying systems can receive same-day approval while reducing the prior timeline from 30 days to one. Crossing the threshold can change permitting treatment, so it should be flagged during design rather than after plans are finalized. Source.

The fast permit route is technical

The solar express instructions require drawings by a licensed architect or structural engineer, total PV panel output no more than 155% of inverter output, and storage no more than 20 kWh, with a 10 kWh limit for some battery chemistries. The homeowner does not need to become a code expert, but should understand that the one-day route depends on a qualifying design. Source.

Keep City approval and ComEd work separate

Even a Chicago project using EPP still requires application to and inspection by ComEd. The City’s speed improvement does not collapse the utility interconnection step into the permit. Any schedule that promises operation merely because a City permit is issued is mixing two agencies and two gates. Source.

Illinois Shines changes the price stack

For Program Year 2026 to 2027, Illinois Shines lists 0 to 10 kW AC distributed-generation REC prices of $70.37 in Group A and $80.77 in Group B. The next band, above 10 through 25 kW, is $60.92 and $79.21. These are REC program prices, not a replacement for a ComEd energy credit, and the applicable group has to be determined for the actual project. Source.

Do not borrow an outdated REC price

The preceding program year listed $66.34 and $75.48 for the 0 to 10 kW AC band, and $57.18 and $69.78 for the next band. A sales deck using older prices without a program-year label is misleading even when the numbers were once accurate. Illinois Shines values are program-specific inputs, not permanent retail electricity rates. Source.

Illinois Solar for All is not an immediate universal offer

ILSFA provides no-upfront-cost residential options for qualifying income-eligible households, with an 80% AMI threshold for a single-family owner and stated 14-day cancellation and 15-year routine-maintenance protections. The supplied research also says single-family and two-to-four-unit capacity was reached in 2025, with more funding expected in 2026. Eligibility is not the same thing as current capacity. Source.

Use Chicago weather without a sunshine sales pitch

Chicago O’Hare’s 1991 to 2020 normals show a 49.9-degree Fahrenheit annual mean temperature and 36.89 inches of precipitation. This city has winter production and snow-shedding considerations that do not map cleanly onto Florida or Hawaii. The number is context for roof and production analysis, not evidence for a fixed annual-output guarantee. Source.

City policy does not override the rider

Chicago reports that all City buildings are sourced by 100% renewable energy as of January 1, 2025 and targets clean renewable electricity for all Chicago consumption by 2035. That is meaningful municipal policy. It does not restore full-retail netting for a household that first interconnects after the 2024 deadline. Keep civic goals and tariff rights distinct. Source.

The Chicago conclusion

The right order is: establish the PTO cohort, calculate supply-only or legacy credits accurately, compare the generation rebate with any legacy tariff protection, then apply REC and permitting rules. In Chicago, the incentives can be valuable, but the interconnection date drives the economics. Source.

Sources and research gaps

Every factual local claim is linked in the text and every cited URL is retained here. Unpublished all-in fees and site-specific estimates are marked n.a.

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