The best solar design software for C&I teams in 2026

How was this list ranked?

Five checks, drawn from what C&I work demands. Whether screening stays cheap, because a developer models many sites to build a few, and a metered license prices out the screening stage. Whether the tool covers the 100 kW to 10 MW band without a tier change. Whether the simulation carries published validation a lender can accept. Whether the design can reach a permit-ready drawing package without leaving for another vendor. And whether the output lands back in CAD as an editable file rather than a screenshot.

One exclusion: residential-first platforms are ranked for what they are, not marked down for serving a different buyer. And one disclosure, again: Solesca wrote this page. The defensible version of that sentence is the table below, where each row carries the caveat a competitor would want printed.

Which solar design software leads for C&I in 2026?

1. Solesca, the C&I-native platform

Solesca is cloud-native design and engineering software for C&I and community solar, with 340+ GW designed on the platform. Both licenses carry unlimited projects, designs run up to 1 GW, and DNV SolarFarmer runs inside the platform, validated within 1% of PVsyst and corroborated by ECA Power's published case study. ARGUS AI reads a rooftop image and returns obstructions with user-specified setbacks in seconds. When a design is done it exports to editable DXF and native PVC, and the plan set add-on on the Engineering License produces plan sets and SLDs, signed by a licensed PE partner. ECA Power ran 900+ projects through it in 2024.

The honest limits: no storage design, no residential focus, and a 2022 founding date, so your next hire probably has not used it before. Those three facts decide most of the cases where a team is right to pick something else on this list.

2. HelioScope, the small-commercial incumbent

HelioScope has been in market since 2014 and most commercial designers have touched it, which is a switching cost in its favor no feature list offsets. It beats Solesca outright on storage: storage design ships from its Basic tier, at $159 a month on published pricing, and Solesca offers none. It also publishes DNV, NREL and CEC validation, so do not pick between the two on simulation accuracy.

The published tiers are the caution. Basic and Pro meter projects at 10 a month and 120 a year, Pro tops out at 5 MW DC, and PVsyst export, API access and SSO sit on the Enterprise tier, priced per project. A C&I team that screens heavily, or works the 5 to 10 MW band, outgrows the metering before it outgrows the tool.

3. PVcase, the AutoCAD-native stack

PVcase wins where drafting is the center of the workflow. Its Ground Mount and Roof Mount products run inside desktop AutoCAD on Windows, so a team that produces construction DWGs all day gets solar tooling in the environment its drafters already master. Terrain-heavy utility-scale ground mount is its home ground, Prospect covers greenfield site selection as its own product, and a large G2 review base makes it an easy choice to defend internally.

The trade is the stack itself. Layout requires an AutoCAD seat per designer, the published system requirements rule out virtual machines, energy modeling is a separate product in Yield, and pricing is by quote. For a C&I team trying to keep iteration cheap before CAD, that is the cost structure to examine before signing.

4. PVsyst, the simulation of record

PVsyst is on this list because every C&I financing conversation eventually reaches it: it is the yield model lenders have accepted for decades, and no platform here displaces that. It is not a layout tool, so it pairs with a design platform rather than competing with one. The practical question is how your layout reaches it. Solesca exports a native PVC file, and PVcase added PVC 2.0 geometry export in August 2026, so both feed PVsyst without a rebuild. If your team only needs the financeable model and does layout elsewhere, PVsyst alone is the cheapest answer on this page.

5. Aurora, the residential leader

Aurora leads residential solar design and sales, and HelioScope is its commercial platform. If your book is homes, Aurora is the right tool and nothing above it on this list is; it wins that segment over Solesca without argument, because Solesca does not serve residential at all. It sits fifth here only because this list ranks fit for C&I and community solar work, where Aurora points its commercial buyers at HelioScope, ranked second.

Which should your team shortlist?

Match the tool to your deliverable. If storage design is in most proposals, shortlist HelioScope and accept the metering. If your engineering runs on Autodesk tooling end to end and your output is a DWG, shortlist PVcase and budget the CAD seats. If your deliverable is an interconnection package for projects between 100 kW and 10 MW, shortlist Solesca, and keep PVsyst as the simulation of record if your lender asks for it, since the hand-off is a native file either way.

Then test rather than trust, this page included. Solesca licenses are unmetered, so running it beside your current tool on live sites costs no allowance. Bring one project, model it in both, and hand the comparison to your engineer of record.

Common questions