StraightUp Solar

StraightUp Solar has spent nearly two decades building what is now one of the most credentialed dedicated residential solar practices headquartered in St. Louis. Founded in 2006 and based at 11696 Lilburn Park Road in St. Louis, the company has installed more than 3,000 residential and commercial solar projects across Illinois and Missouri, and the in-house roster is unusually NABCEP-dense — the company states that more than half of its team holds NABCEP individual certification, a credentialing concentration that is rare in the residential solar industry and that our research team treats as a meaningful professional-standard signal at this volume tier.

What stood out to our research team is the comprehensive single-source operating model. StraightUp Solar manages residential and commercial solar projects end-to-end — design, engineering, permitting, installation, and post-install maintenance — with dedicated electricians, NABCEP-certified technicians, and installers operating as full-time employees rather than subcontractors. The company is fully licensed and insured in both Missouri and Illinois, and the dual-state operating model translates into deep familiarity with Ameren Missouri, Ameren Illinois, and ComEd interconnection workflows. StraightUp also maintains an active EnergySage Marketplace profile and a published service offering that includes maintenance for systems originally installed by other companies.

Prospective customers should know that StraightUp's residential focus is paired with substantial commercial scale, which means homeowners should ask pointed questions about how residential and commercial workflows are sequenced within the company's crew dispatch system and whether residential project timelines are affected by larger commercial backlogs. Reasonable diligence questions include verifying the specific NABCEP individual credentialed for the homeowner's system design, confirming Ameren Missouri interconnection experience for the project's county, pinning down the workmanship warranty term, and asking which panel and inverter manufacturers the company is currently authorized to install. The fundamentals — St. Louis headquarters, 19 years of continuous operation, more than 3,000 installations, NABCEP-dense in-house team, dual-state licensing, and a comprehensive service offering — place StraightUp Solar firmly in the third-ranked position for 2026.

With a composite score of 73.0 out of 100, StraightUp Solar holds the third-ranked position in Missouri for 2026.