Expert Verified — Written by Keyur Rakholiya, SurgePV Editorial. 10 tools evaluated across the full EPC workflow. Pricing verified July 2026. Based on 1+ GW of delivered projects across 50+ countries.
No single tool runs a solar EPC business. Every project moves through survey, design, simulation, financials, proposals, procurement, and construction. Each stage has software built for it, and the tools you choose at each layer decide your speed and your error rate.
We run an EPC ourselves. Over 10+ years and 1+ GW delivered, we have used, tested, or evaluated every tool on this list against real project workflows. We know where the handoffs break, because we have fixed them.
This guide ranks the 10 tools that make up a complete solar EPC software stack in 2026. We cover what each layer costs, where each tool wins, and where it genuinely falls short. That includes our own product.
Quick Picks
| Pick | Tool | Why |
|---|---|---|
| Best design layer for residential EPC sales | Aurora Solar | LIDAR design, Sales Mode, 7,000+ companies |
| Best all-in-one design-to-proposal core | SurgePV | Design, shading, financials, and proposals in 1 workflow |
| Best bankable simulation layer | PVsyst | The lender standard for 30+ years |
| Best C&I design and simulation | HelioScope | DNV validated within 1% of PVsyst |
| Best financial modeling layer | Energy Toolbase | 70,000+ utility rates, storage economics |
| Best free stack foundation | OpenSolar | $0 design, CRM, proposals, e-signature |
How We Evaluated
We scored each tool on 5 criteria. Weighting reflects what keeps an EPC profitable.
| Criterion | Weight | What We Measured |
|---|---|---|
| Workflow coverage | 25% | How much of the EPC lifecycle the tool handles well |
| Accuracy | 25% | Shading, yield, and financial numbers vs. real projects |
| Handoff quality | 20% | How cleanly data moves to the next layer |
| Scalability | 15% | Performance from residential to utility-scale |
| Total cost | 15% | Subscription, per-seat, and per-project pricing |
At-a-Glance Comparison
| Tool | Stack Layer | Starting Price | Free Trial | Cloud | Standout |
|---|---|---|---|---|---|
| Aurora Solar | Design + sales | Custom (contact sales) | Demo only | Yes | Sales Mode proposals in under 3 minutes |
| SurgePV | Design-to-proposal core | $1,899/yr (3 users) | Yes | Yes | One dataset from shading to signed proposal |
| PVsyst | Bankable simulation | ~$775/yr | 30 days | No (Windows) | P50/P90 reports lenders require |
| HelioScope | C&I design + simulation | $159/mo | Demo only | Yes | Within 1% of PVsyst, DNV validated |
| Energy Toolbase | Financial modeling | $199/user/mo | Demo only | Yes | 70,000+ utility rates maintained in-house |
| OpenSolar | Free foundation | $0 | Free forever | Yes | Full CRM and proposals at no cost |
| Arka360 | Emerging-market all-in-one | $199/mo (US) | Contact sales | Yes | CRM plus NEC permit packages |
| RatedPower | Utility-scale design | Custom (contact sales) | Demo only | Yes | 43+ GW designed, 90% faster layouts |
| Enact Solar | Operations + asset management | $199/mo (3 users) | Yes | Yes | End-to-end platform after PVComplete acquisition |
| Scanifly | Site survey | Custom (contact sales) | Demo only | Yes | Drone-based models accurate to 1–3 inches |
1. Aurora Solar — Best Design Layer for Residential EPC Sales Teams
Aurora Solar anchors the design layer for more US residential EPCs than any other tool. Over 7,000 companies use it, per Aurora Solar, and its LIDAR-assisted 3D modeling sets the pace for the category.
What It Does Well
The design-to-sales flow is mature. A rep models the roof, runs automated shading, and generates a proposal in Sales Mode in under 3 minutes. For a residential EPC running 20+ site assessments a week, that speed compounds.
Accuracy is validated. Independent studies put Aurora’s production estimates within a few percent of measured output, and its shading engine handles complex roofs well. Contract management and e-signature live in the same platform, so the design layer connects directly to revenue.
G2 reviewers rate Aurora 4.6 out of 5, with support at 9.0 out of 10. The API and dealer network features make it the default for EPCs that also run partner channels.
Our Take: Aurora earns the top design-layer slot for residential EPC sales. You pay enterprise prices, and you will still add PVsyst or Energy Toolbase the moment a financed C&I deal lands on your desk.
Where It Falls Short
Pricing is opaque and expensive for small teams. Automated roof modeling misses obstructions often enough that engineers must verify every design. Commercial and industrial projects above a few hundred kW stretch the platform, and storage economics are thin.
Key Features
- LIDAR-assisted 3D roof modeling and shading
- Sales Mode proposals with e-signature
- Pricing automation: flat, per-watt, per-component
- API and dealer management for channel sales
Pricing
- Foundation, Build, Grow, Scale: Custom pricing, contact sales
- Free trial: Guided demo only
Who Should Use Aurora Solar
Strong fit: US residential EPCs with 10+ sales reps and premium software budgets. Probably not right for: Small installers, C&I-heavy pipelines, and teams outside Aurora’s core markets.
2. SurgePV — Best All-in-One Design-to-Proposal Core
Full disclosure: we build SurgePV. We ranked it #2 because Aurora still owns enterprise residential sales. For EPCs who want the design, simulation, financial, and proposal layers unified, this is the strongest core we know.
What It Does Well
Most EPC stacks break at the handoffs. A designer exports numbers, a salesperson re-types them, and the proposal drifts from the engineering. We built SurgePV to remove those handoffs.
The solar design software layer handles 3D rooftop layouts and string sizing. The solar shadow analysis software runs physics-based shading on the same model. The generation and financial tool then produces payback, internal rate of return (IRR), and net present value (NPV) from the identical dataset. The solar proposal software turns it into a branded, customer-ready document. Clara AI assists with proposal copy along the way.
In our own testing, a residential project moves from address to sendable proposal in under 10 minutes. The component database covers major modules and inverters, and everything runs in the browser with no installs.
Our Take: If your stack’s biggest cost is rework between design and sales, consolidating on 1 dataset fixes it. SurgePV is not a CRM and not a project management tool, and we do not pretend otherwise.
Where It Falls Short
There is no native CRM, so pipeline tracking needs an external tool. There is no mobile app and no API yet. Very large sales orgs may still want Aurora’s rep management, and utility-scale EPCs need RatedPower or PVCase for plant layouts.
Key Features
- 3D rooftop design, layout, and string sizing
- Physics-based shadow analysis
- Generation and financial modeling with payback, IRR, and NPV
- Branded PDF proposals with Clara AI copy assistance
Pricing
- For 3 Users plan: $1,899/year — design, simulation, financials, and proposals included
- Free trial: Available with full capabilities
Who Should Use SurgePV
Strong fit: Residential and commercial EPCs who want 1 dataset from survey to signed contract. Probably not right for: Utility-scale developers, or teams that need built-in CRM and project tracking.
Want to see the full workflow on a real project? Book a 20-minute demo.
3. PVsyst — Best Bankable Simulation Layer
PVsyst is the yield report behind financed solar. For 30+ years, lenders have underwritten projects on its P50 and P90 numbers, per PVsyst. No EPC stack serving financed projects is complete without it.
What It Does Well
Bankability is the product. P50, P90, P95, and P99 uncertainty analysis comes built in, and most financiers require exactly that format. Billions of dollars in projects have closed on PVsyst reports.
The engineering depth is unmatched. Version 8 adds unlimited orientations, sub-hourly clipping correction, and detailed loss modeling for soiling, degradation, and mismatch. The database holds 14,000+ modules and 4,500+ inverters.
G2 reviewers rate its design and engineering at 9.4 out of 10, the highest in the category. For a deeper look at simulation tools, see our best solar simulation software ranking.
Our Take: Every C&I and utility EPC needs PVsyst in the stack. Use it to generate numbers, never to present them — pair it with a real proposal layer.
Where It Falls Short
The interface is dated, and ease of use scores 7.1 out of 10 on G2. It runs on Windows only, with no cloud collaboration. There are no customer-facing outputs, and new engineers take weeks to become productive.
Key Features
- P50/P90/P95/P99 bankable uncertainty analysis
- Detailed loss, bifacial, and storage modeling
- 14,000+ modules and 4,500+ inverters in the database
- Batch processing and command-line automation
Pricing
- Professional: CHF 700/year (~$775) — volume discounts from 2 licenses
- Free trial: 30 days, full features
Who Should Use PVsyst
Strong fit: EPCs and developers building financed C&I or utility-scale projects. Probably not right for: Residential sales teams and anyone needing polished customer documents.
4. HelioScope — Best C&I Design and Simulation Layer
HelioScope, now part of Aurora Solar, fills the C&I design layer that Aurora’s residential focus leaves open. It pairs fast layout tools with bankable simulations for projects up to 15 MW.
What It Does Well
Speed with credibility. DNV found HelioScope within 1% of PVsyst, and users report 4x faster design iterations than desktop tools. For a C&I EPC iterating layouts with a customer, that combination is rare.
The module-level simulation handles rooftops, carports, and ground mounts. P50 comes on the Basic plan; P90, P95, and P99 arrive on Pro. Exports to PVsyst and Energy Toolbase keep the handoff to deeper layers clean.
The Pro plan adds a drag-and-drop proposal editor with custom branding. For 100 kW to 5 MW deals, HelioScope can carry a project from layout to credible quote in 1 subscription.
Our Take: HelioScope is the sweet spot for C&I design work: near-PVsyst credibility at a fraction of the learning curve. Add Energy Toolbase when storage economics decide the deal.
Where It Falls Short
There is no native battery modeling. Financial analysis scores 5.2 out of 10 on G2, well below dedicated tools. Performance lags past 10,000 modules, and small residential work feels clumsy.
Key Features
- Module-level simulation validated within 1% of PVsyst
- P50/P90/P95/P99 production estimates
- Rooftop, carport, and ground-mount layouts to 15 MW
- PVsyst and Energy Toolbase export integrations
Pricing
- Basic: $159/month — 1 user, 10 projects, 1.25 MW cap
- Pro: $259/month — adds LIDAR, P90+, financials, proposals
- Free trial: Demo only; academic discounts available
Who Should Use HelioScope
Strong fit: C&I EPCs designing 100 kW to 5 MW projects. Probably not right for: Residential-focused teams, storage-heavy deals, and utility-scale plants.
5. Energy Toolbase — Best Financial Modeling Layer
Energy Toolbase (ETB) is the economics layer of a serious C&I stack. Its utility rate database is the deepest we have tested, and storage economics are its specialty.
What It Does Well
Rates decide whether savings math survives diligence. ETB maintains 70,000+ utility rates across 1,200+ territories with an in-house rates team, per Energy Toolbase. Quotes built on stale tariffs die in committee; ETB’s hold up.
Storage modeling separates it from everything else. Multi-value stream analysis stacks demand charge reduction, time-of-use arbitrage, and grid services in 1 model. California’s NEM 1.0, 2.0, and 3.0 complexity is handled natively.
The customer evidence is strong. SunGreen Systems cut proposal time from 16 hours to 1 to 2 hours using ETB. Proposals generate as professional web pages with unlimited optimization runs.
Our Take: If your EPC sells on savings math, ETB is the most defensible financial layer available. It has no design capability, so budget for a design tool beside it.
Where It Falls Short
You import 8760-hour production data from HelioScope, Aurora, or PVsyst — there is no native design. No CRM integration, no mobile apps, and pricing starts at $199 per user per month. Public reviews are scarce.
Key Features
- 70,000+ utility rates maintained in-house
- Solar + storage NPV, IRR, payback, and cash flow
- NEM 3.0 and multi-value stream storage modeling
- Instant PPA quotes via financing partners
Pricing
- ETB Developer: $199/user/month — 10% annual discount
- Free trial: Demo only
Who Should Use Energy Toolbase
Strong fit: C&I EPCs and ESCOs whose deals hinge on defensible savings projections. Probably not right for: Residential installers wanting an all-in-one, or budget-tight teams.
Quote From Real Engineering Data
See how SurgePV turns design, shading, and financials into a customer-ready proposal in 1 workflow.
Book a DemoNo commitment required · 20 minutes · Live project walkthrough
6. OpenSolar — Best Free Stack Foundation
OpenSolar is the only genuinely free platform that covers multiple stack layers. Over 28,000 users in 185+ countries pay nothing for design, CRM, proposals, and e-signatures, per OpenSolar.
What It Does Well
The price is the headline: $0 forever, unlimited projects, unlimited users. OpenSolar monetizes hardware partners and lenders instead of installers. For a new EPC assembling its first stack, that removes the biggest barrier.
The coverage is real. 3D design with shading, a built-in CRM, interactive proposals with financing options, and e-signature all live in 1 login. Users report proposals in under 2 minutes once templates are set. Accuracy is third-party validated by PVEL and a US government agency.
For small residential EPCs, OpenSolar can serve as 3 or 4 stack layers at once. Most teams are operational in under 1 day.
Our Take: OpenSolar is the right foundation for a new or small EPC. Know the ceiling — projects cap around 500 kW, and you will graduate layers to dedicated tools as deal size grows.
Where It Falls Short
The 500 kW cap rules out C&I and utility work. Photogrammetry-based modeling is less precise than LIDAR. There is no offline mode, and the CRM cannot match dedicated platforms for larger teams.
Key Features
- 3D design studio with real-time shading
- Built-in CRM, payments, and financing integrations
- Interactive proposals with e-signature
- Full iOS and Android apps
Pricing
- Free tier: $0 — unlimited projects, users, and features
- Free trial: Not needed; the product is free
Who Should Use OpenSolar
Strong fit: New and small residential EPCs, budget-conscious teams, emerging markets. Probably not right for: Projects above 500 kW, bank-grade engineering, offline field work.
7. Arka360 — Best Stack-in-a-Box for Emerging-Market EPCs
Arka360 serves 4,000+ installers across 27 countries, with deep roots in the US and India. It bundles design, CRM, proposals, and permit packages at small-business prices.
What It Does Well
The scope-to-price ratio stands out. Design, shading analysis, a built-in CRM, and proposal generation live in 1 platform. Users report proposals in under 5 minutes and full workflows in 20.
The permit layer is the differentiator for EPCs. Arka360 delivers NEC-compliant permit sets in 48 hours, or under 8 hours expedited, with professional engineer stamps available. That replaces a layer most tools ignore.
Ease of use is the top user praise on G2, where Arka360 holds 4.7 out of 5 across 117 reviews. India pricing starts at ₹7,500 per month, which fits emerging-market budgets. Indian EPCs weighing in-house versus outsourced design should read this founder’s playbook on the tradeoff.
Our Take: Arka360 is the practical all-in-one for a growing EPC that cannot afford Aurora pricing. Expect some rough edges in performance and repetitive layout steps.
Where It Falls Short
Missing features are the top user complaint on G2. Users report performance issues and occasional instability. Panel re-selection for each new polygon slows layout work, and utility-scale support is limited.
Key Features
- 3D design with LIDAR-based shading analysis
- Built-in CRM with lead and pipeline tracking
- NEC-compliant permit packages with PE stamps
- Mobile app for field proposals
Pricing
- US Basic: $199/month — 1 user, residential and commercial
- US Premium: $358/month — 2 users, battery sizing, CAD export
- India Lite: ₹7,500/month or ₹46,000/year — 360 residential projects
- Free trial: Contact sales
Who Should Use Arka360
Strong fit: Small and mid-size EPCs in the US, India, and other emerging markets. Probably not right for: Utility-scale developers and teams needing polished performance at scale.
8. RatedPower — Best Utility-Scale Design Layer
RatedPower automates utility-scale plant design. Over 4,300 professionals in 130+ countries have designed 43+ GW with it, per RatedPower, including teams at Iberdrola, Engie, BayWa, and Shell.
What It Does Well
Automation is the claim, and the evidence backs it. RatedPower reduces plant design time by up to 90% compared with traditional workflows. Site analysis, topography, layout, and electrical configuration iterate in minutes.
The platform covers photovoltaic plants, battery energy storage systems (BESS), and hybrids. G2 reviewers rate it 4.5 out of 5 across 252 reviews, and every tier includes unlimited users and projects. That pricing structure suits EPCs with large engineering teams.
Since the Enverus acquisition in 2022, the PRISM integration connects site selection directly to design. For utility EPCs, that closes the gap between prospecting and engineering.
Our Take: RatedPower is the design layer for utility-scale work, full stop. It does nothing for rooftop EPCs, and you still need PVsyst for the final bankable report.
Where It Falls Short
Pricing is custom and enterprise-grade. There is no free trial, only demos. Rooftop and small C&I work is out of scope, and the output feeds detailed engineering rather than replacing it.
Key Features
- Automated utility-scale PV, BESS, and hybrid plant design
- Topography-based site analysis and layout optimization
- Unlimited users and projects on all tiers
- PRISM integration for site selection to design
Pricing
- Basic, Advanced, Enterprise: Custom pricing, contact sales
- Free trial: Demo and product tour only
Who Should Use RatedPower
Strong fit: Utility-scale EPCs and developers designing plants above 5 MW. Probably not right for: Rooftop installers, residential teams, and small C&I shops.
9. Enact Solar — Best Operations and Asset Management Layer
Enact Solar covers the layers most design tools skip: project operations, customer engagement, and asset management. Its January 2026 acquisition of PVComplete created an end-to-end platform from design through operations.
What It Does Well
The two-sided model is unusual. Enact serves both installers and end customers, with monitoring apps that keep the EPC connected after commissioning. The platform processes $1.5B+ in annual projects across 25+ countries.
Design-as-a-service is built in. Teams can outsource designs with 24-hour delivery for residential and 48 to 72 hours for large commercial. That flexes engineering capacity without hiring.
The PVComplete acquisition added PVCAD permit-ready engineering tools, which users report cut design time by 50%. Combined with the unified CRM and $199 per month entry price for 3 users, Enact covers more of the stack per dollar than most enterprise platforms.
Our Take: Enact is the operations layer for EPCs managing many concurrent projects and long-term customers. It is broader than it is deep — verify its design accuracy against a dedicated tool before relying on it.
Where It Falls Short
Breadth trades against depth in each layer. The design engine is newer and less proven than Aurora or HelioScope. Public reviews are limited, and the PVCAD tools require AutoCAD familiarity. Enterprise scale-up pricing is opaque.
Key Features
- Unified CRM, design, and asset management
- Design-as-a-service with 24-hour turnaround
- PVCAD permit-ready engineering tools
- Customer-facing monitoring apps
Pricing
- Platform Entry: $199/month — up to 3 users, support and training included
- PVCAD Bundle: $245/month — includes AutoCAD license
- Free trial: Available
Who Should Use Enact Solar
Strong fit: Growing EPCs managing 20+ concurrent projects with long-term service relationships. Probably not right for: Teams needing best-in-class depth in any single layer.
10. Scanifly — Best Site Survey Layer
Scanifly owns the first layer of the stack: the site survey. Its drone-based workflow produces 3D models accurate to 1 to 3 inches, and regulators across the US have approved its shading methodology, per Scanifly.
What It Does Well
Accuracy at the source prevents every downstream error. DroneDesign captures geo-tagged imagery and builds photorealistic 3D models with real-time shading. The 100% fitment guarantee means the design matches the roof on install day.
Regulatory acceptance is a genuine moat. Scanifly is the only drone-based shading tool approved by NYSERDA, MassCEC, the California Energy Commission, Austin Energy, and major lenders. For EPCs in incentive markets, that approval removes a documentation headache.
The economics work too. EmPower Solar cut software spend by 53% after switching from Aurora to Scanifly, with reported savings of $100 to $300 per project. PrelimDesign handles remote sales designs from satellite and Nearmap imagery before any truck rolls.
Our Take: Scanifly pays for itself on any EPC that still measures roofs by hand or loses money on redesigns. It is a survey layer, not a design suite — plan the rest of the stack around it.
Where It Falls Short
Subscription pricing is not public, and design services run on a credit system that needs budgeting. Drone flights require certified pilots and weather windows. Proposal and financial features are thin compared with dedicated sales tools.
Key Features
- Drone-based 3D models accurate to 1–3 inches
- Regulator-approved shading analysis nationwide
- PrelimDesign remote designs from satellite imagery
- Integrations with Energy Toolbase and sales platforms
Pricing
- Subscription: Custom, contact sales — credit-based design services
- Free trial: Demo only
Who Should Use Scanifly
Strong fit: US residential and commercial EPCs who want survey-grade accuracy and fewer install-day surprises. Probably not right for: Teams outside drone-friendly markets, or those wanting an all-in-one.
Building Your Stack by EPC Segment
Match the layers to your project mix before you book demos.
- New residential EPC (under 10 employees): OpenSolar as the foundation. Add SurgePV when design-to-proposal errors start costing deals.
- Established residential EPC (10+ reps): Aurora Solar for design and sales, Scanifly for surveys. Add PVsyst when financed C&I appears.
- C&I EPC (100 kW to 5 MW): SurgePV or HelioScope for design, Energy Toolbase for financials, PVsyst for lender reports.
- Utility-scale EPC (5 MW+): RatedPower for plant design, PVsyst for bankability, AutoCAD-based tools for detailed engineering.
- Emerging-market EPC: Arka360 for the all-in-one scope at local pricing.
- Multi-project EPC with service contracts: Enact Solar for operations and asset management.
How to Choose Your Solar EPC Software Stack
Evaluate any stack against these 6 principles before you commit budget.
- Fix the most expensive handoff first. Every export-and-retype between tools introduces errors and hours. Consolidate the 2 layers where your team loses the most time.
- Own 1 source of truth for production numbers. Design, simulation, and proposal should inherit the same dataset. Divergent numbers become cancelled contracts.
- Match the simulation layer to your financing. Financed C&I and utility deals need PVsyst-grade P90 reports. Cash residential deals do not.
- Price the whole stack, not each tool. A $0 tool plus a $775 tool plus a $1,899 tool can beat 1 $15,000 platform — or the reverse. Do the math per project.
- Check the ceiling of every layer. Residential tools cap out between 15 and 500 kW. Know which tool you graduate to before you hit the wall mid-project.
- Trial with real jobs, not demos. Run 3 actual projects through any trial. Industry-observed failure rate of software picked from demos alone is high — the demo project is always the easy one.
Pro Tip
Count your stack’s handoffs, not its logins. A 4-tool stack with clean integrations often beats a 2-tool stack where data moves by spreadsheet. Map where every production number travels before you buy anything.
Myth-Busting: The All-in-One Fallacy
The biggest myth in EPC software is that 1 platform should do everything. Vendors sell this because consolidation wins contracts. It rarely wins projects.
Every all-in-one has a strongest layer and several weak ones. Aurora’s design is excellent; its storage economics are thin. OpenSolar’s price is unbeatable; its engineering caps at 500 kW. Even our own product has no CRM.
The contrarian truth: the best stacks are deliberately hybrid. Pick the best tool for the 2 layers that decide your margin — usually design accuracy and financial credibility — and let simpler tools cover the rest. Pay for depth where errors cost you money, and accept “good enough” everywhere else.
Conclusion
A solar EPC software stack is a set of decisions about where accuracy matters and where speed matters. The 10 tools above cover every layer from drone survey to lender report, and each earns its place for a specific segment.
Your next steps:
- Map your current handoffs. List every point where a number moves between tools or people this month. That list is your buying priority.
- Trial 2 stacks against real projects. Pick a primary candidate and a challenger for your weakest layer, and run the same job through both.
- Calculate cost per project, not per seat. Divide annual software spend by project volume. The cheapest stack is the one that wins the most profitable work.
If your weakest handoff sits between design and proposal, see how SurgePV keeps 1 dataset across both. Book a 20-minute demo.
Frequently Asked Questions
What is a solar EPC software stack?
A solar EPC software stack is the set of tools an engineering, procurement, and construction company uses across the project lifecycle. It typically covers site survey, system design, energy simulation, financial modeling, proposals, CRM, and project management.
How much does a complete solar EPC software stack cost?
A multi-tool stack for a 3-person team typically costs $5,000 to $20,000 per year. Free tools like OpenSolar can cover early-stage needs, while all-in-one platforms like SurgePV consolidate design, simulation, and proposals into 1 subscription.
Can 1 tool replace a whole solar EPC software stack?
Partially. Platforms like SurgePV and Aurora Solar cover design through proposals. But bankable simulation (PVsyst), deep storage economics (Energy Toolbase), and drone surveys (Scanifly) still live best as dedicated layers for most EPCs.
What software do utility-scale solar EPCs use?
Utility-scale EPCs typically combine RatedPower or PVCase for plant design, PVsyst for bankable yield reports, and AutoCAD-based tools for detailed engineering. Financial models usually run in Excel or specialized platforms.
Do solar EPCs need a CRM in their software stack?
Yes, once lead volume passes what a spreadsheet can track. OpenSolar and Arka360 include built-in CRMs. Larger EPCs often add a dedicated CRM or an operations platform like Enact for multi-project management. See our best solar CRM software ranking for options.
What is the most important layer in an EPC software stack?
The design and simulation layer, because every downstream document inherits its numbers. A shading or yield error at design time becomes a wrong savings promise in the proposal and a dispute after commissioning.
