Solar Power Companies in Illinois Expanding Renewable Energy Usage
Illinois ranks #10 in total installed capacity, with ~6.37 GW online, enough to power about 1.0 million homes, and CEJA continues to push toward 40% renewables by 2030. Programs like Illinois Shines and the Ameren smart-inverter rebate continue to lower project costs.
In this guide, you will find Illinois-headquartered installers first, followed by verified local branches, each with what they actually install (PV, batteries, EV), workmanship terms, equipment stacks, monitoring, certifications, and financing paths.
Top 15+ Solar Installers in Illinois
These solar installation companies and EPCs focus on state-wide or Illinois-based projects.
1. Ailey Solar Electric
Chicago-based, in-house installer for homes, businesses, and nonprofits. What sets them apart is a published workmanship warranty, hands-on battery, and EV charging capability.
- Handled projects that require residential, commercial, and non-profit PV installations. They explicitly list Detach & Reset (panel removal/re-install) for roof work.
- 10-year workmanship (manufacturer warranties on equipment).
- REC or Panasonic modules with SolarEdge electronics.
- Monitoring systems supported via manufacturer apps like mySolarEdge/Enphase App
If you are shortlisting solar installers in Illinois, Ailey stands out for roof coordination services, program literacy, and a clear commitment to workmanship and tools.
2. Certasun
Illinois-focused and residential-first solar company in Illinois, Certasun works without subcontractors (design → permits → install) and pairs that with a system production guarantee and modern gear (REC/Maxeon + Enphase).
- 10-year installer warranty, including 10-year roof-leak coverage tied to the array.
- Long-term panel warranties (up to 25 years for product/performance, brand-dependent).
- Serves with REC and Maxeon modules with Enphase microinverters.
- Storage options include Tesla Powerwall 3 and FranklinWH aPower 2.
- Solar systems use manufacturer apps (e.g., Enphase Enlighten, Tesla app).
- Home batteries, EV charging, solar repair services, and heat-pump water heater installs.
- Installs 240-V home EV chargers and publishes updates on ComEd EV-charger rebates.
Certasun is a tight solar power company in Illinois with NABCEP credentials, battery/EV depth, and loan/bridge-loan options with finance partners (Regions and EnerBank).
3. Tron Solar
A solar-plus-roofing contractor with in-house crews and licenses across general, electrical, and roofing. Tron Solar proves valuable if you want PV, add storage, install an EV charger, and standard pass-through equipment warranties.
- Warranties are panel/inverter brand-specific. Many run 20–25 years.
- Certified battery: Tesla Powerwall, Enphase, FranklinWH, and Qcells Q.HOME.
- Offers EV charger installs (Level 2).
You may prefer Tron if you want one contractor that can legally handle roof + solar + storage + EV and get you live on the monitoring app without the hand-offs that cause delays.
4. Windfree Solar
Chicago-headquartered since 2009, delivering residential and commercial solar with in-house design/build, plus battery storage and EV-charging station development, which is useful if you want a team that routinely handles homes, schools, and businesses across Illinois.
- 15-year workmanship warranty.
- 30-year complete solar warranty covering panels, inverters, and batteries.
- Installs battery storage alongside PV and also develops EV charging stations.
- Documented as an Equity Eligible Contractor (EEC) and Certified Minority Business Enterprise (MBE) in the Illinois program materials.
- Their portfolio spans rooftop + ground-mount mixes.
Windfree is a solar installer in Illinois with education/nonprofit chops, optional coverage, and credentials that can help qualify for Illinois equity-oriented incentives.
5. ReThink Electric
An EPC-led, NABCEP-credentialed team that handles design through interconnection for homes and businesses. What stands out is their deep electrical bench (ICC-approved for both DG solar and EV-charging work) and a track record of in-house solar installation and apprenticeships, which are helpful when you want one crew to own the whole scope end to end.
- 10-year workmanship warranty.
- Listed partners include Enphase, SolarEdge, Tesla, sonnen, Silfab, Canadian Solar, Panasonic, IronRidge, and SnapNrack.
- Residential and commercial installs; services include installation, electrical/general contracting, solar O&M, and even community-solar participation.
ReThink Electric is a solar power company in Illinois with a single-vendor path for PV + EVSE, a broad equipment bench, and hard credentials (ICC + NABCEP), suited to homeowners who want fewer handoffs and clear accountability.
6. RxSun
Residential-focused, solar installer in Illinois known for clean aesthetics, no subs, and a standout bundled warranty. If you want a homeowner-friendly package with extended protection and premium gear, RxSun is your ultimate choice.
- SolarInsure 30-year coverage on parts, labor, and roof penetrations.
- 10-year service, 20-year inverter, 25-year panel baseline coverage.
- Installs REC panels with Enphase microinverters.
- Promotes clean conduit routing and black-on-black panel aesthetics.
- Also runs a donate-with-install program (1,000 meals per system via Feeding America).
A homeowner-focused Illinois solar installer emphasizing extended warranty coverage, premium REC+Enphase stacks, and one-team delivery.
7. Kapital Electric
A full-service electrical contractor that installs residential + commercial PV, home & commercial EV charging, Tesla Powerwall, and SPAN smart panels. They are the top solar company in Illinois if you want one team to handle solar, storage, load management, and charger rebates.
- Workmanship warranty of ~10 years.
- 25-year parts & labor on panels/inverters/racking. EverVolt battery 12-year parts & labor.
- Panasonic PV (authorized installer).
- Homes, businesses, condos/MF, and niche scopes like cold-storage facilities.
- Illinois Commerce Certified solar installer (per company).
- Lists American-made panels among options.
One accountable contractor with rebate know-how and defined O&M, which is good if you want electrification pieces handled together instead of choosing multiple vendors.
8. WCP Solar
An engineering-led shop that does PV and solar-thermal (domestic hot water, radiant heating, cooling, pool heating, even CSP), with design-to-install delivery and grant-writing assistance.
- Focus on grid-tied rooftop PV for residential & commercial properties.
- PV & racking projects include CdTe thin-film, frameless carport work (rare in residential; relevant for glare/weight constraints), and large rooftop arrays.
- Standby generators are offered in-house.
- Documented battery + PV for PJM frequency regulation at an Illinois manufacturing site.
Shortlist WCP if you want an engineering & solar installer in Illinois that can pair PV with thermal, generators, carports, or industrial storage, but get clarity upfront on workmanship term, the monitoring app, and who will handle Illinois Shines/ABP REC paperwork.
9. Iconic Energy
Iconic Energy is an install-first solar company that builds, monitors, and fixes systems. You get robust warranties plus a crew that will actually pick up the phone for maintenance.
- 25-year warranty on panels and wiring, 25-year installation warranty.
- Inverter warranty up to 10 years.
- Roof penetrations are covered by a 25-year installation warranty.
- Authorized/certified to service SolarEdge, Enphase, and Fronius.
- Residential, commercial, and agricultural portfolios with multi-hundred-kW case studies.
You get a builder that pairs extended warranties with active monitoring and real service ops, plus EV capabilities, applicable if you want one accountable partner from install to year 25.
10. Legacy Solar + Electric (SunPower by Legacy Solar)
Legacy is a one-stop solar, battery, and electrical contractor. They lean on Enphase microinverter architectures, offer Tesla/Enphase storage, and have in-house electricians. It is handy when you want PV alongside panel upgrades, generator tie-ins, or EV charging.
- Battery equipment carries 10–15-year warranties.
- Enphase systems (microinverters with Sunlight Backup for daytime outage resilience without a battery); Enphase and Tesla storage.
- Highlights proactive issue detection/monitoring.
- “Flexible payment options” with minimal upfront and even debt-free paths.
- 2,000+ local installs (execution depth).
Choose Legacy if you want microinverter-first systems, credible storage options, and complete electrical trades under one roof.
11. Tick Tock Energy
A family-owned Illinois solar installer with a strong ground-mount/trackers focus for farms, rural homes, municipalities, and C&I. They are also Pearl-certified, which may help document energy upgrades for resale value.
- Broad bench of panels: Qcells, JA, Trina, Canadian Solar, Mission Solar, Silfab, etc., and inverter lines Enphase, SolarEdge, SMA, Solectria, APsystems, Chilicon, & Sol-Ark.
- Offers SMA Secure Power daytime outlet options, AC-coupled battery backups, and even off-grid packages.
- 25-year panel power warranties.
- Ground mounts, single-axis, and dual-axis trackers.
Choose Tick Tock Energy when you need non-rooftop yield, broad equipment choice, and a team comfortable with battery backup and municipal/ag scopes.
12. New Prairie Solar (by New Prairie Construction)
New Prairie Solar is a solar company in Illinois that is deeply involved in service offerings, starting from monitoring every system weekly for 25 years.
- 10-year from commissioning, service troubleshooting is covered for 5 years, and workmanship does not transfer to new owners.
- Fault monitoring at no cost for 25 years.
- SolarEdge inverter + optimizers: 25-year warranty when purchased through NPS.
- Modules typically 25-year product & performance; roof attachments: 25-year leak-proof.
- Home, business, agriculture, nonprofits. They also design solar pergolas and specialty structures via their construction arm.
- NABCEP Board-Certified PV Installation Professional + PV Design Specialist + Associates on staff.
- ICC Certified DG Installer, Illinois Roofing License, BPI Building Analyst; FAA drone pilot for site imaging.
Handles Illinois Shines SRECs via Carbon Solutions Group with lump-sum payout for ≤10 kW AC, includes net-metering and Ameren Smart Inverter Rebate caveats.
13. SolarWerks
A PV + solar-thermal shop with in-house design/consulting and a roofing partner (ACA Roofing). Coordinate PV, solar hot water/air, and roof scope under a single plan. Their portfolio spans single-family, multi-unit, and light commercial.
- For solar-thermal, they list Velux dealer status.
- PV plus solar air heating, solar water heating, and solar pool panels.
- Multi-unit hot-water installs covering ~65–70% of usage.
- Mixed PV + thermal on residential and commercial roofs.
Design & Consulting service + roofing integration via ACA simplifies scope (audit → 3D model → install → interconnect), reducing handoffs when reroof or waterproofing is in play.
14. Illinois Solar Services
A full-scope Illinois installer for residential, commercial, municipal, and agricultural projects, with a standout “whole-system” warranty and a union-built approach using U.S.-made components.
- 30-year coverage that explicitly includes the panels, microinverters, and installation/workmanship.
- Handles RMA and manufacturer/third-party warranty claims.
- 12 months of free post-PTO support.
- Truck-roll and hourly rates for non-warranty work.
- Partners with local IBEW electrical contractors for standardized installs.
Illinois Solar Services, a solar installer in Illinois, offers comprehensive coverage, transparent service policies, and assistance with incentives, making it a practical choice for homeowners.
15. GRNE by Nelnet (GRNE Solar)
An EPC backed by Nelnet that now focuses on commercial, industrial, agricultural, and utility-scale work, pairing build capability with financing, tax equity, and co-investment options.
- Emphasizes Commercial Installation, Agricultural, and EPC Solutions across the state.
- Lease options for governments/businesses with $0 out-of-pocket short-term structures.
- Partner for Illinois Solar for All (ILSFA) participation.
- EPC plus long-term operations and maintenance.
Choose GRNE by Nelnet when you need C&I-grade EPC with financing/tax-equity under one roof, especially for manufacturing, logistics, campuses, or municipal portfolios aiming for scale.
16. StraightUp Solar
An EPC active in Illinois and Missouri with a long track record and in-house service. What stands out is the paired 10-year workmanship + 10-year production guarantees, plus Certified B Corp status and strong NABCEP bench strength.
- 25-year warranty for panels, inverters have a 10–25-year warranty depending on type.
- Installs PV with batteries, smart panels, and EV charging; systems include online monitoring via component makers.
- Offers loan options via Clean Energy Credit Union and Dividend Solar.
They back design estimates with guarantees that ensure maximum power production.
17. 93Energy (93Energy Solar)
A Commercial-first solar installer in Illinois with multi-state coverage. 93Energy is well known for its work across various property types and offers clear financing paths (bridge loans, term loans, leases/PPAs).
- 30 Year Warranty on its agricultural offering (paired with base manufacturer warranties).
- Project types include focus on commercial/industrial, agriculture, warehousing, cold storage, and municipal/education.
- Installs EVSE. Highlights Wallbox Pulsar Plus, SPAN Drive, & Enel X JuiceNet options.
If you are comparing IL providers for C&I, ag, or fleet electrification, 93Energy’s financing depth and EV lineup make scoping multi-measure projects simpler.
18. Unity Solar Group
Oak Brook–based EPC with a strong Illinois Solar for All (ILSFA) focus, meaning eligible households and nonprofits can access no-cost installs with guaranteed savings and long-term support. Also active in residential (non-ILSFA), commercial, and community solar.
- For ILSFA projects, Unity provides a 15-year warranty covering installation, O&M, roof penetrations, and performance.
- Uses standardized Tier-1 panels/inverters/racking and offers 24/7 cloud-based monitoring.
- Project types: Residential (ownership/loan/lease), commercial, and community solar subscriptions for renters/unsuitable roofs.
For low- to moderate-income customers (or nonprofits) seeking no-cost solar through state programs, or for commercial sites, USG is purpose-built.
19. Stateline Solar
Local, construction-forward EPC for homes, farms, and small C&I across northern IL/southern WI/eastern IA. What makes them practical is in-house service for non-customer systems, local bank financing, and a visible EV-charging footprint that signals post-install competence.
- 5-year workmanship covering racking, panels, and wiring.
- They service and repair arrays they didn’t install.
- The brand set includes REC, Trina, Jinko, Mission Solar, SolarEdge, & Unirac.
- Roof & ground-mount for residential, ag, and small commercial.
- Financing ties with German American State Bank.
A “keep-it-local” solar installer in Illinois with flexible service/O&M and local-bank financing. Stateline also uses a level-2 EV charging station at its HQ.
20. Route 66 Solar
Union-built, full-stack installer that keeps design → permits → install → monitoring under one roof. They explicitly state in-house IBEW crews (no subcontracting), publish their equipment stack, and offer a warranty on premium installs.
- 25-year wraparound warranties on premium installations.
- Component makers also list 25-yr terms: Meyer Burger panels, Enphase microinverters, Unirac racking incl. roof-penetration details.
- Enphase microinverters (25-yr standard; fleet/app monitoring).
- Roof-mount, ground-mount, and ballasted flat-roof approaches.
- All three Illinois branches:
- Springfield: 1 W Old State Capitol Plaza, Suite 505, Springfield, IL 62701
- Champaign: 1807 S Neil St, Suite 3, Champaign, IL 61820
- Edwardsville: 2110 Troy Rd, Suite B1, Edwardsville, IL 62025
A union-installed stack with clear, U.S.-made components and lender choice makes Route 66 Solar an easy shortlist for homeowners who want one team from audit to app.
Choose What Matters When Picking an Illinois Solar Company
Solar can cut your monthly bills. With the 30% federal tax credit and Illinois SRECs (if you qualify), your out-of-pocket cost may drop, allowing payback sooner. If you are income-qualified or a nonprofit, Illinois Solar for All may offer no-cost options with guaranteed savings.
Add a battery and keep essentials on during outages, like lights, Wi-Fi, the fridge, and medical devices, without firing up a generator. If you drive an EV, pairing solar with a Level-2 home charger lets you “fuel” at home for less and on your schedule.
Working with an installer that designs, permits, installs, and services in-house means one accountable partner. You avoid hand-offs and the “who owns this problem?” loop.
