Your engineering team.
Without the overhead.
Feasibility studies, plan sets, site surveys, and permitting support for C&I solar and BESS projects — delivered fast, priced upfront.
Trusted by Leading Solar and Storage Companies Across North America
Everything your projects need.
Nothing you don't.
We work the way you already do — by project phase. Pick what you need, get it fast, move on to the next milestone.
Feasibility & Design
Site assessments, energy modeling, and preliminary layouts to validate your project before you commit capital.
Plan Sets & Permitting
From 10% conceptual through IFC and as-builts — AHJ-ready, code compliant. PE stamping available in all 50 states.
Sales Engineering
Proposals, savings analyses, and financial models that help you close deals faster.
Site Surveys & Reports
Boots-on-ground site visits with comprehensive reports covering structural, electrical, and environmental factors.
Specialty Engineering
Three-line diagrams, single-line diagrams, stamping, interconnection apps, commissioning plans, and technical research.
Every engineering subscription includes our full platform — free.
$0 / ForeverStop paying for Procore, generic CRMs, and estimating tools that weren't built for solar. Our platform covers your entire project lifecycle — from lead to closeout — in one place.
Solar CRM
Track leads, proposals, and pipeline. When a deal closes, your project data flows straight into engineering.
Preconstruction
Estimates, BOMs, schedules of value, and scope packages — organized by project before a shovel hits the ground.
Project Management
WBS, budgets, pay apps, change orders, and WIP tracking. One place for the entire construction lifecycle.
Field Platform
Daily logs, time tracking, QA/QC checklists, and photo documentation — from your crew's phone to your dashboard.
From signup to deliverable in 24 hours.
Start with free credits, get real engineering back, and use the platform tools to manage everything that follows.
Sign up & get free credits
Create your account and receive credits to use on any engineering service. No credit card, no commitment.
Submit your first project
Upload site info and specs. Your project lands in a preconstruction workspace where you track every detail alongside our engineers.
Get your deliverables
Review, request revisions, and approve — all inside the platform. Helioscopes, plan sets, and permits delivered fast.
Build with confidence
When construction starts, your project data is already organized. Daily logs, QA/QC, and field docs are ready for your crew.
Try PhaseOne with free credits.
No contracts. No commitments. Use your credits on any deliverable and experience the speed yourself.
Claim Free Credits- ✓Real deliverables, not demosYour free credits produce actual project outputs you can use.
- ✓Full platform accessOrder tracking, team chat, revision management — all included.
- ✓No credit card requiredStart immediately. Scale up only when you're ready.
Fixed prices. No surprises.
Pay per deliverable or subscribe for ongoing engineering capacity. Scale up or down anytime.
Trusted by teams building real projects.
“PhaseOne has become an extension of our engineering team. They move fast, understand utility-scale requirements, and deliver drawings that actually match the field realities. I don't need to double-check every detail anymore — they get it.”
“PhaseOne's team jumped in seamlessly and helped us close engineering gaps that were holding up our schedule. Clear communication, strong technical skills, and zero drama.”
“We value partners who move as fast as we do — PhaseOne delivered high-quality models and drawings within days. Their ability to adapt to our community solar and storage projects has been a game changer.”
“Working with PhaseOne feels effortless. They understand C&I development inside out and consistently deliver accurate layouts and energy models that make financing easier.”
“PhaseOne helped us keep a 3-site portfolio on track through constant design revisions and utility coordination. They're proactive, responsive, and understand the real pressures of EPC schedules.”
“Joel's team has cut our turnaround time in half. We can now quote more projects without adding headcount. The level of clarity and consistency in their deliverables is unmatched.”
“We've worked with a lot of engineering vendors, and PhaseOne stands out for being practical. They don't overcomplicate things — they just deliver what's needed, when it's needed, and it's always solid work.”
“PhaseOne helps us stay lean and competitive. Their on-demand model gives us flexibility without compromising quality — it's like having a full engineering department at our fingertips.”
“The PhaseOne team bridges the gap between design intent and constructability. Their deliverables are clean, compliant, and always on time. It feels like working with an in-house department that just happens to be remote.”
“Our internal team was stretched thin until we brought in PhaseOne. Now we handle more volume with confidence. Their engineers are sharp, reliable, and flexible with our changing scopes.”
“PhaseOne has been instrumental in our early-stage development work. They anticipate interconnection issues before they happen and give us the data we need to make solid go/no-go calls.”
Your next project shouldn't wait
on engineering.
Start with free credits. Get a real deliverable back. Then decide if PhaseOne is your engineering team.