Top 10 Best Solar Design Services of 2026

Jacobs provides engineering execution for utility-scale and distributed generation projects with a strong emphasis on coordinated technical scope across site, structures, and electrical systems. Design work commonly centers on solar photovoltaic system design, electrical design deliverables such as single-line diagram outputs, and construction-ready drawing sets built for permit and bid workflows. Integration between disciplines is practical when structural loading, routing, and electrical design decisions must stay consistent across revisions.

A tradeoff appears in turnaround flexibility, since Jacobs’ multidisciplinary engineering process favors controlled review cycles and disciplined change management. Jacobs fits when developers and EPC teams need engineering that can withstand permitting and interconnection scrutiny, including projects with constrained rooftops or large ground-mount layouts where assumptions must be defensible. Use cases that involve many stakeholders benefit from Jacobs’ ability to document design intent in a way construction teams can translate.

WSP is a strong fit when solar design must move from early layouts into construction-ready drawings with coordinated electrical scope and structural load considerations. The engagement shape suits teams that need repeatable engineering outputs for rooftops, ground mounts, and larger utility-scale sites. WSP’s value shows up in how it ties system design choices to downstream permit and interconnection requirements instead of handing off loosely connected assumptions.

A key tradeoff is that WSP’s engineering depth can increase iteration cost when design changes are frequent after feasibility review. WSP fits best when procurement and permitting timelines require configuration discipline, such as inverter stringing decisions, DC-to-AC ratio selection, and cable routing implications. Teams using WSP for early-stage layouts typically benefit most when they provide site constraints and owner standards up front to reduce rework.

DNV works well for projects that require engineering rigor across site, energy, and electrical scope, because deliverables typically connect preliminary design decisions to permitting and interconnection steps. The typical workflow emphasizes clear technical assumptions, which helps internal reviewers and third parties understand why sizing and layout choices were made. Teams benefit most when they already have module, inverter, and array boundary preferences or when DNV is given those inputs early enough to converge designs into a permit-grade output.

A common tradeoff is schedule cost when DNV is brought in late, because quality gates and documentation traceability increase iteration cycles after layouts and grid assumptions change. DNV is a strong usage fit when EPC or solar developers must coordinate multiple stakeholders, including electrical design reviewers and permitting authorities, around a consistent set of drawings and calculations.

Ramboll delivers solar design work across distributed generation and utility-scale projects with a strong engineering and regulatory posture. The service typically spans early site and layout scoping through construction-ready deliverables that integrate structural, electrical, and permitting needs.

Stantec delivers solar design work that spans site assessment through construction-ready drawing packages, including mechanical and electrical scope coordination for rooftop and ground-mounted projects. The service supports photovoltaic system design deliverables such as energy yield assessment inputs, array layout and plane-of-array considerations, and electrical design artifacts like single-line diagrams and electrical site plans.

Kimley-Horn delivers solar design services that lean on civil engineering and site-development depth for rooftop, ground-mounted, and utility-scale projects. The firm’s core work centers on photovoltaic system design outputs that integrate layout decisions with permitting-grade documentation and electrical design coordination.

Westwood Professional Services is distinctive because its solar design work is packaged as engineering outputs that stay tied to permitting constraints and interconnection needs. The firm delivers photovoltaic system design artifacts that translate site assumptions into drawings teams can use for approvals. Shading and solar access inputs influence early array layout so later engineering cycles focus on refinement rather than rework. Structural and electrical constraints are reflected in the permit set rather than handled as separate stand-alone studies.

Ulteig focuses on solar design work for EPCs and project developers, with delivery geared toward engineering documentation for permitting and interconnection workflows. The core strengths center on photovoltaic system design packages, including electrical drawings that support string sizing, inverter selection, and site-level layout.

Sargent & Lundy delivers solar design work that covers site planning and engineering documentation for EPC and large solar project teams. Its engineering scope typically spans photovoltaic system design with electrical layout deliverables such as single-line diagrams and construction-ready drawings.

Burns & McDonnell delivers solar design services through engineering-led teams that handle both electrical and civil scope across distributed generation and large projects. Its work typically covers photovoltaic system design inputs such as layout planning, electrical design, and construction-ready drawing sets for permitting and build.