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⛰️ Colorado Top 10 Solar State

Colorado Solar
Permit Plan Sets.
NEC 2020.
PE Stamped. Snow Load Calculated.

Colorado solar permitting requires PE-stamped structural engineering for snow and wind loads — and Xcel Energy interconnection takes 12–16 weeks on its own. Every Colorado plan set needs to be complete, accurate, and ready for the Xcel Solar Team on day one. We build it that way.

NEC 2020 Compliant PE Stamped — Snow & Wind Xcel Energy Solar*Rewards Holy Cross Energy All 64 Counties
Order Colorado Plan Set → Xcel Energy Guide ↓
NEC 2020 Adopted statewide
12–16 wks Xcel Energy interconnection
100+ psf Mountain snow loads
39 Days Median permit timeline (NREL)
64 Colorado Counties
39 Days Median permit timeline (NREL)
12–16 Wks Xcel Energy interconnection
PE Required Snow + wind structural stamps
Net Metering Retail rate — HB10-1001
Colorado Solar Permits

The State Where Structural Engineering and Interconnection Timing Make or Break a Solar Project

Permit Design prepares Colorado solar permit plan sets for solar installers, EPCs, and roofing companies across all 64 Colorado counties. Colorado is one of the most technically demanding solar permitting states in the US — not because of regulatory complexity, but because of two factors that affect every project: snow loads and Xcel Energy.

Ground snow loads range from 30 psf on the Denver metro Front Range to over 100 psf in Aspen, Vail, and mountain communities. Every Colorado solar permit plan set requires PE-stamped structural calculations specific to the project's county and elevation — not generic values. And Xcel Energy's interconnection review takes 12–16 weeks, completely separate from the local building permit. Colorado EPCs who don't submit the Xcel interconnection application the same day as the building permit application add 3–4 months to total project timelines unnecessarily.

We process 2,000–2,500 plan sets every month. Every Colorado plan set is NEC 2020 compliant, PE stamped for your specific county's snow and wind loads, and formatted to Xcel Energy, Holy Cross Energy, PRPA, United Power, Black Hills Energy, or your specific utility's interconnection documentation requirements. If your Colorado AHJ requests revisions, we handle them at no extra charge.

Last updated: May 2026 · Reading time: ~8 minutes · NEC 2020 and Xcel Energy Solar*Rewards references current as of May 2026.

Xcel Energy Interconnection

The Most Important Colorado Solar Timeline Fact Most Installers Miss

Xcel Energy is Colorado's largest utility — serving Denver, Boulder, Fort Collins, Colorado Springs, and the entire Front Range. Its interconnection timeline changes how every Colorado solar project must be planned.

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Xcel Energy Interconnection Takes 12–16 Weeks — Separate from Your Building Permit
Xcel Energy solar interconnection in Colorado takes 12 to 16 weeks following initial application submission — assuming no distribution system upgrades are required. When grid upgrades become part of the review, timelines extend by 3 to 6 additional months. This 12–16 week Xcel review runs completely independently of your local building permit. Colorado EPCs who wait for building permit approval before submitting the Xcel interconnection application are adding 3–4 months to total project timelines that they cannot recover. Submit to Xcel Energy on the same day you submit the building permit application.
Xcel Energy Solar*Rewards Process
9-Step Interconnection Workflow
✓ Submit interconnection application to Xcel Solar Team: SolarProgram@xcelenergy.com
✓ Xcel conducts engineering review against distribution system standards
✓ CPUC rules govern the interconnection queue and approval timelines
✓ Red door hanger confirms Permission to Operate (PTO) on system activation
✓ Solar*Rewards production-based incentive begins at PTO date
Parallel Submission Strategy
Submit Both on Day One
Day 1: Submit local building permit application + Xcel Energy interconnection application simultaneously
Weeks 2–6: Local building permit approved (typical Front Range timeline)
Weeks 8–14: Xcel interconnection review continues — do not wait for permit to start this
Week 12–16: Xcel PTO issued — system energised. Total timeline: 12–16 weeks instead of 24+
Permit Design Colorado plan sets include Xcel interconnection documentation ready on delivery day. Every Colorado Xcel Energy plan set is formatted to Xcel's distribution system review standards. Your interconnection application reference number field is included on the cover sheet. Submit to Xcel and your local AHJ the same day you receive your plan set from us.
Snow Load Requirements

Colorado Solar Snow Load Requirements by Region — 2026

Colorado has the widest range of solar-relevant snow loads in the continental US. Every plan set must document structural capacity for the location-specific ground snow load per ASCE 7-22. This is the single most variable element in any Colorado solar plan set.

Colorado RegionKey Cities / CountiesGround Snow Load (psf)PE Structural StampUtilityNotes
Denver Metro Front RangeDenver, Aurora, Lakewood, Englewood30–35 psfRequired most AHJsXcel EnergyLowest CO snow loads. Xcel 12–16 week interconnection still applies.
Boulder / FoothillsBoulder, Longmont, Broomfield, Louisville35–50 psfRequiredXcel Energy / PRPAElevation increases snow loads above Denver. Wind exposure higher.
Fort Collins / North Front RangeFort Collins, Loveland, Greeley, Windsor30–40 psfRequiredPRPA / XcelPRPA serves Fort Collins via municipal utility. High wind plains exposure.
Colorado Springs / Pikes PeakColorado Springs, Pueblo, Canon City35–55 psfRequiredXcel Energy / Black HillsPueblo served by Black Hills Energy — different interconnection process from Xcel.
Summit / Eagle CountiesBreckenridge, Vail, Eagle, Frisco60–80 psfRequired — criticalHoly Cross Energy / XcelHoly Cross Energy mountain territory. Snow drift from valley terrain significant.
Roaring Fork ValleyAspen, Glenwood Springs, Carbondale70–100 psfRequired — criticalHoly Cross EnergyHoly Cross territory. Among highest snow loads in continental US for solar.
North/Central MountainsSteamboat Springs, Telluride, Crested Butte80–100+ psfRequired — complexHoly Cross / Rural Co-opsHighest snow loads in Colorado. Snow drift calculations critical near dormers and ridgelines.
Western SlopeGrand Junction, Montrose, Durango25–40 psfRequiredXcel / Rural Co-opsLower snow loads due to high desert climate. High solar irradiance — strong solar market.
Snow drift calculations required for all Colorado mountain projects. Any Colorado rooftop solar installation near a parapet wall, dormer, chimney, or roof level change must include snow drift calculations per ASCE 7-22 Section 7.8. At 80–100+ psf ground snow loads, snow drift can add 160–200 psf of localised load — exceeding roof structural capacity in older mountain homes. Every Permit Design Colorado mountain plan set includes snow drift analysis at no extra charge.
PE Stamp Requirements

Colorado Solar PE Stamp Requirements — Structural and Electrical

Colorado requires PE-stamped engineering documentation for solar permit plan sets in most jurisdictions — particularly for structural analysis of snow and wind loads. Here is exactly when each type of PE stamp is required.

Stamp Type 1
Structural PE Stamp
✓ Required for roofs over 15–20 years old in most Colorado AHJs
✓ Required for all mountain community projects (snow loads ≥ 60 psf)
✓ Required when solar system adds more than 5 lbs/sq ft to existing roof load
✓ Required for tile, slate, or any roof type requiring penetration engineering
✓ Xcel Energy requires PE-stamped structural documentation as part of interconnection review
✓ Must show compliance with ASCE 7-22 ground snow load, wind load, and dead load calculations for the specific Colorado county
ASCE 7-22 · ASCE 7-22 Section 7.8 (Snow Drift)
Stamp Type 2
Electrical PE Stamp
✓ Required for commercial solar installations across Colorado
✓ Required for systems ≥ 10 kW in many Colorado Front Range jurisdictions
✓ Xcel Energy requires engineering review of the single-line diagram for interconnection approval — effectively requiring PE-level documentation even for residential projects
✓ Lafayette, CO explicitly requires: "All diagrams and the engineer's evaluation letter must be stamped and signed by a Colorado licensed engineer showing existing structure compliance"
✓ Battery storage projects require separate PE-stamped NEC Article 706 documentation alongside NEC 690
NEC 2020 Article 690 · NEC Article 706 (Storage)
Permit Design coordinates Colorado PE stamps for every plan set that requires them. We work with Colorado-licensed Professional Engineers for both structural and electrical review. PE stamp coordination is included in your Colorado plan set delivery — no separate engineering firm search required. Mountain community projects with complex snow loads are handled with the same 24–48 hour turnaround.
What's Included

Colorado Solar Permit Plan Set Contents

Every Colorado solar permit plan set includes these sheets — NEC 2020 compliant, PE stamped for your county's specific snow and wind loads, and formatted for Xcel Energy, Holy Cross Energy, or your specific Colorado utility.

01
Cover Sheet
Project address, county, AHJ details, NEC 2020 code references, Colorado-licensed PE name and seal, system specifications, and Xcel Energy interconnection application reference field. Formatted to your specific AHJ's submittal requirements.
02
Site Plan
Scaled site plan with property boundaries, utility meter location, Xcel Energy or Holy Cross service entry, fire code access pathways, and array-to-inverter routing. CPUC interconnection application documentation fields included for Xcel territory projects.
03
Roof Layout
Panel array layout with roof pitch, orientation, structural attachment points, fire code setbacks, and rafter/truss details. Colorado-specific fire setback requirements applied. Tile and slate roof attachment details included. Snow accumulation clearance documented for mountain projects.
04
Single-Line Diagram
Complete electrical schematic NEC 2020 Article 690 compliant — from PV source circuits through inverter to utility interconnection. Formatted for Xcel Energy Solar*Rewards interconnection review, Holy Cross Energy standards, PRPA municipal requirements, or other Colorado utility documentation formats.
05
Structural Calculations — Snow & Wind
PE-stamped structural analysis per ASCE 7-22 — dead load, snow load, and wind load calculations specific to the project county and elevation. Ground snow loads from 30 psf (Denver metro) to 100+ psf (mountain communities). Snow drift calculations at roof obstructions. Wind exposure category per county terrain. Required by Xcel Energy and Colorado AHJs.
06
Rapid Shutdown Documentation
NEC 2020 Section 690.12 rapid shutdown compliance — system boundary, initiating device, array dimensions, and all required labeling per NEC 690.56(C). Colorado building officials verify rapid shutdown compliance before issuing the final permit sign-off required for Xcel interconnection.
07
Utility Interconnection Package
Interconnection documentation formatted for Xcel Energy Solar*Rewards, Holy Cross Energy, PRPA, United Power, Black Hills Energy, or your specific Colorado utility. Interconnection application reference number field included on cover sheet. Submit to your utility the same day as the building permit application.
08
Equipment Datasheets
UL-listed manufacturer spec sheets for all components — modules, inverters, optimizers, racking, and battery storage. All documentation meets Xcel Energy's interconnection engineering review standards and Colorado AHJ requirements. Battery storage projects include separate NEC Article 706-compliant documentation.
Colorado Utilities

Colorado Solar Utility Interconnection — All Territories

Colorado has a complex utility landscape. Every plan set must include interconnection documentation formatted for the specific utility serving the project address — not a generic package.

Xcel Energy Public Service Company of Colorado Denver · Boulder · Fort Collins · Colorado Springs · Front Range

Largest CO utility. Solar*Rewards program. 12–16 week interconnection. CPUC regulated. Submit interconnection application in parallel with building permit on Day 1.

Holy Cross Energy Holy Cross Energy (Co-op) Aspen · Vail · Glenwood Springs · Eagle · Roaring Fork Valley

Mountain communities cooperative. Operates independently from Xcel and CPUC. Own rebate programs. High snow load territory (60–100+ psf).

PRPA Platte River Power Authority Fort Collins · Loveland · Longmont · Estes Park

Wholesale power supplier for 4 municipalities. Solar interconnection managed by each municipal utility. Fort Collins Utilities handles Fort Collins residential solar.

United Power United Power (Co-op) Weld County · Adams County · North of Denver

Electric cooperative serving rural and suburban areas north of Denver. Own interconnection process separate from Xcel Energy.

Black Hills Energy Black Hills Energy Colorado Pueblo · Canon City · Southeast Colorado

Investor-owned utility in southeast Colorado. CPUC regulated. Own Solar*Connect program for Pueblo area customers.

Rural Co-ops Delta-Montrose · PVREA · Other Rural Co-ops Western Slope · Rural Weld · Northeast Colorado

Multiple rural electric cooperatives serve Colorado's agricultural and mountain communities. Each has distinct interconnection processes outside of CPUC oversight.

All Colorado utility territories covered. Every Permit Design Colorado plan set includes interconnection documentation formatted for your specific utility. The interconnection application number field is on every cover sheet — submit to Xcel Energy, Holy Cross Energy, or your cooperative on the same day you submit the local building permit to maximise your project timeline.
Process

How Colorado Solar Permit Plan Sets Work

Three steps from project details to AHJ-ready and utility-ready Colorado plan set — with snow loads calculated and Xcel Energy interconnection documentation included.

01

Submit Your Colorado Project

Send us the city and county, roof photos or satellite image, equipment model numbers, and your utility (Xcel Energy, Holy Cross, PRPA, etc.). We confirm the AHJ's NEC edition, snow load zone for your specific county, and PE stamp requirements before building your plan set.

02

We Build to Your County's Snow Zone

Our Colorado specialists prepare your complete plan set — NEC 2020 compliant, PE stamped for your specific county's ASCE 7-22 snow and wind loads (not generic values), formatted to your AHJ's submittal requirements, and with Xcel Energy or Holy Cross interconnection documentation included.

03

AHJ-Ready + Xcel-Ready in 24–48 Hours

Your complete Colorado solar permit plan set lands in your inbox within 24–48 hours. Your interconnection application number field is on the cover sheet — submit to Xcel Energy and your local AHJ simultaneously on day one. Revisions handled at no extra charge until your Colorado AHJ approves.

First-Time Colorado Clients

Try Us on Your First Colorado Project. Free.

New to Permit Design? Send us your first Colorado residential solar project and we'll deliver the complete plan set free of charge — NEC 2020 compliant, PE stamped for your county's snow loads, Xcel Energy or Holy Cross interconnection package included.

Available for first-time clients only. One free residential plan set per company.

Claim Your Free CO Plan Set →
✓ NEC 2020 compliant
✓ PE stamped — county-specific snow loads
✓ Xcel Energy Solar*Rewards ready
✓ Holy Cross / PRPA / co-op coverage
✓ Free revisions until AHJ approval
Colorado Solar Market

Colorado Solar Market — 2026 Data

39 Days
Median Permit Timeline (NREL SolarTRACE)
Colorado's statewide median solar permit timeline is 39 days from application to approval per NREL SolarTRACE data. Denver and Boulder Front Range permits typically process in 2–4 weeks. Mountain community AHJs with smaller building departments may take 4–8 weeks. Remember: this 39-day permit timeline runs simultaneously with — not before — the Xcel Energy 12–16 week interconnection review.
12–16 Wks
Xcel Energy Interconnection Timeline
Xcel Energy's 12–16 week interconnection review is the single most important timeline factor for Colorado solar EPCs. Xcel's review runs independently of the building permit process. Colorado EPCs who submit the Xcel interconnection application on the same day as the building permit application complete projects 3–4 months faster than those who wait for permit approval first.
NREL HQ
National Renewable Energy Lab — Golden, CO
The National Renewable Energy Laboratory (NREL) is headquartered in Golden, Colorado. NREL produces the definitive US solar irradiance data, SolarTRACE permitting benchmarks, and solar technology research that underpins the US solar industry. Colorado benefits from some of the best solar resource data in the country — and a state culture of renewable energy support that has driven strong solar adoption.
HB10-1001
Colorado Net Metering Law — Retail Rate
Colorado's net metering law (HB10-1001) mandates retail-rate net metering for all investor-owned utilities and electric cooperatives. Xcel Energy customers receive credit for excess solar generation at the full retail electricity rate. Credits roll over monthly. Colorado's Solar Rights Act prevents HOAs from unreasonably restricting code-compliant solar installations statewide.
REES
Property Tax Exemption — Renewable Energy Equipment
Colorado's Renewable Energy Equipment Exemption (REES) exempts solar installations from property tax assessment increases statewide. The added value of a solar system is not included in the appraised value of a Colorado property. Colorado also exempts solar equipment from state sales tax. Combined with Xcel Energy's Solar*Rewards production incentive and retail-rate net metering, Colorado offers a strong solar financial package.
July 4
ITC Construction Deadline — 2026
Commercial and C&I solar EPCs in Colorado must begin construction by July 4, 2026 to lock in the Investment Tax Credit's four-year window. Colorado AHJ reviews run 2–6 weeks. Add Xcel Energy's 12–16 week interconnection timeline. With 18+ weeks of combined review time, Colorado commercial EPCs who have not yet submitted by May 2026 are at serious risk of missing the ITC deadline.
Colorado AHJ Rejections

Top 3 Reasons Colorado Solar Permits Get Rejected

Colorado's PE stamp requirements and Xcel Energy's engineering review standards create rejection risks unique to this state. These are the three most common Colorado-specific triggers across Denver, Boulder, Fort Collins, Colorado Springs, and mountain communities.

01
PE Stamp Missing — Snow Load Analysis
The most common Colorado rejection: plan sets submitted without PE-stamped structural calculations for the project county's specific snow load. Jurisdictions including Lafayette explicitly require "all diagrams and the engineer's evaluation letter to be stamped and signed by a Colorado licensed engineer." Generic racking manufacturer load tables are not accepted as substitutes. Mountain community AHJs (Summit, Eagle, Pitkin counties) require PE-stamped snow drift analysis in addition to ground snow load calculations.
ASCE 7-22 / Colorado PE stamp requirement
How we prevent it: Every Colorado plan set includes PE-stamped structural calculations specific to the project county's ASCE 7-22 snow load zone — not generic values. Mountain community snow drift analysis included.
02
Xcel Energy Interconnection Package Wrong Format
Xcel Energy requires interconnection documentation formatted to its specific distribution system review standards. Generic single-line diagrams submitted to Xcel's Solar Team trigger correction requests that delay interconnection approval — adding weeks to the already 12–16 week review window. The most common error: submitting a plan set designed for AHJ review, not formatted to Xcel's specific interconnection documentation requirements. Xcel and the local AHJ have different documentation needs.
Xcel Energy Solar*Rewards interconnection standards
How we prevent it: Every Xcel Energy Colorado plan set includes a dedicated interconnection package formatted to Xcel's Solar Team documentation requirements — separate from the standard building permit plan set.
03
Snow Load Values Not Site-Specific
Colorado building officials increasingly reject structural calculations that use generic or interpolated snow load values rather than ASCE 7-22 county-specific ground snow loads. In the Denver metro, using 30 psf when the project is in a 35 psf zone triggers a correction. In mountain communities, any deviation from the county-specific ASCE 7-22 snow load map value is rejected. Xcel Energy's engineering review independently flags snow load calculation errors before issuing interconnection approval.
ASCE 7-22 Chapter 7 / County-specific values
How we prevent it: Snow load values are pulled from the ASCE 7-22 ground snow load map for the exact project county and elevation — never generic state averages or interpolated values.
See all 8 common plan set rejection reasons and fixes → Residential Solar Permit Design →
FAQ

Colorado Solar Permit Design — Frequently Asked Questions

Specific answers to the questions Colorado solar installers ask most — covering snow loads, Xcel Energy timelines, PE stamps, and interconnection.

Colorado solar permits are governed by NEC 2020, adopted through local building codes. Colorado has no single statewide electrical code adoption — each municipality adopts independently. Denver, Boulder, Fort Collins, Colorado Springs, Aurora, and most Front Range cities enforce NEC 2020. All Colorado solar permit plan sets must comply with NEC 2020 Article 690 and NEC 690.12 for rapid shutdown.
Yes. Colorado requires PE-stamped structural documentation for most solar permit plan sets, particularly for snow and wind load analysis. Lafayette explicitly requires engineer-stamped drawings. Xcel Energy requires engineering review as part of interconnection approval. Mountain community projects with snow loads of 60–100+ psf require PE-stamped structural calculations and snow drift analysis. Permit Design coordinates Colorado-licensed PE stamps for every plan set that requires them.
Xcel Energy solar interconnection in Colorado takes 12–16 weeks following initial application submission, assuming no grid upgrades are required. When distribution system upgrades are necessary, timelines extend by 3–6 additional months. This 12–16 week Xcel review is completely separate from the local building permit. Colorado EPCs must submit the Xcel interconnection application in parallel with — not after — the local building permit to avoid adding months to total project timelines.
Xcel Energy's Solar*Rewards program provides production-based incentives for qualifying solar installations in Xcel Energy's Colorado service territory. Applications are submitted to Xcel's Solar Team at SolarProgram@xcelenergy.com. Plan sets must meet Xcel's engineering documentation standards. The Colorado Public Utilities Commission (CPUC) oversees the Solar*Rewards program and Xcel Energy's interconnection process statewide.
Colorado snow loads vary dramatically by location. Denver and Front Range: 30–35 psf. Boulder foothills: 35–50 psf. Fort Collins area: 30–40 psf. Summit and Eagle counties (Vail, Breckenridge): 60–80 psf. Roaring Fork Valley (Aspen, Glenwood Springs): 70–100 psf. Mountain communities like Steamboat Springs and Telluride: 80–100+ psf. Every plan set must use ASCE 7-22 county-specific values — not generic averages. Snow drift calculations are required for all mountain projects near roof obstructions.
Colorado has multiple utilities: Xcel Energy (Public Service Company of Colorado) serves Denver, Boulder, Fort Collins, Colorado Springs, and the Front Range. Holy Cross Energy serves Aspen, Vail, Glenwood Springs, and mountain communities. PRPA supplies Fort Collins, Loveland, Longmont, and Estes Park through municipal utilities. United Power serves Weld and Adams counties north of Denver. Black Hills Energy serves Pueblo and southeast Colorado. Multiple rural electric cooperatives serve agricultural and mountain areas. Each has distinct interconnection requirements.
Yes. Colorado's net metering law (HB10-1001) mandates retail-rate net metering for all investor-owned utilities and electric cooperatives. Xcel Energy customers receive full retail-rate credits for excess solar generation, with credits rolling over monthly. Colorado's Solar Rights Act prevents HOAs from unreasonably restricting compliant solar installations. Community Solar Gardens are also available, enabling renters and non-ideal-roof homeowners to subscribe to shared solar and receive bill credits.
Colorado provides: (1) Renewable Energy Equipment Exemption (REES) — solar added value exempt from property tax assessment statewide; (2) State sales tax exemption on qualifying solar equipment; (3) Xcel Energy Solar*Rewards production-based incentive for Xcel customers; (4) Holy Cross Energy rebate programs for mountain community members. Commercial and C&I EPCs must begin construction by July 4, 2026 to lock in the federal ITC four-year window.
The Colorado Public Utilities Commission (CPUC) regulates investor-owned utilities in Colorado — including Xcel Energy and Black Hills Energy. The CPUC governs interconnection queues, technical review timelines, and net metering requirements for investor-owned utilities. Rural electric cooperatives and municipal utilities (like PRPA-served communities) operate under different frameworks outside direct CPUC oversight. CPUC decisions directly affect Solar*Rewards program rates and interconnection timelines for Xcel Energy customers.
Colorado's statewide median solar permit timeline is 39 days per NREL SolarTRACE data. Denver and Boulder typically: 2–4 weeks. Fort Collins and Colorado Springs: 2–5 weeks. Mountain communities: 4–8 weeks. Remember: the 39-day permit timeline is completely separate from — and runs simultaneously with — Xcel Energy's 12–16 week interconnection review. Submit both applications on the same day to run these timelines in parallel.
Permit Design delivers Colorado solar permit plan sets within 24–48 hours of receiving project details. Every plan set is NEC 2020 compliant, PE stamped for your county's specific ASCE 7-22 snow and wind loads, formatted to your AHJ's submittal requirements, and includes interconnection documentation for Xcel Energy, Holy Cross Energy, PRPA, United Power, Black Hills Energy, or your specific Colorado utility. Revisions handled at no extra charge until your Colorado AHJ approves.
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Reviewed & Verified By Licensed Professional Engineers (PE) across all 50 US states · 2,500+ AHJ-ready plan sets delivered monthly · 150+ solar installer partners worldwide Last reviewed: May 2026 · About Permit Design →
NEC 2020 · 2023 · 2026 Licensed PE Engineers All 50 US States 3,000+ AHJs Covered
Neighboring States

Solar Permit Plan Sets — Neighboring & Mountain States

🌴 California NEC 2026 🌵 Arizona Local AHJ 🎰 Nevada NEC 2023 ⭐ Texas NEC 2023 🏜️ New Mexico NEC 2020

Ready for First-Pass Colorado AHJ Approval?

NEC 2020 · PE Stamped · Xcel Energy Solar*Rewards · Holy Cross Energy
All 64 Counties · 24–48 hr delivery · Revisions until your Colorado AHJ approves

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