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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteHow long does it really take to get solar permitted and connected? We measured it in 316 cities across 9 states.
Avg. permit: 6.9 days · Avg. interconnection: 17.0 days · Total: 24 days to PTO
316
Cities Measured
9
States Covered
8 days
Fastest Total (Georgetown, TX)
40 days
Slowest Total (Boston, MA)
After you sign a solar contract, the clock starts on a process most homeowners know nothing about: permitting and interconnection. Your installer designs the system, pulls building permits from your city, schedules inspections, and then waits for your utility to approve the grid connection. Only after the utility grants Permission to Operate (PTO) can you flip the switch and start saving.
This process takes anywhere from 8 days in Georgetown, TX to 40 days in Boston, MA. The difference is driven by local building department efficiency, utility processing speed, historic district requirements, and whether your city accepts online permit applications.
We compiled data from 316 cities across 9 states where NuWatt operates to create this Permit Friction Index -- the most comprehensive public dataset of solar permitting timelines available. This data comes from municipal building department records, installer field data, and NuWatt project history through March 2026.
States ranked by average total days from permit application to PTO. Lower is better. Texas leads due to streamlined online permitting and fast utility processing.
| Rank | State | Cities | Avg Permit Days | Avg Interconnect Days | Avg Total Days | Fastest City | Slowest City | Online Permit % |
|---|---|---|---|---|---|---|---|---|
| 1 | Texas (TX) | 47 | 4.5 | 11.2 | 15.7 | Georgetown(8d) | Galveston(25d) | 72% |
| 2 | New Hampshire (NH) | 28 | 5.4 | 16.5 | 21.9 | Salem(12d) | Portsmouth(34d) | 46% |
| 3 | Vermont (VT) | 30 | 5.8 | 14.2 | 20 | South Burlington(13d) | Stowe(32d) | 40% |
| 4 | Rhode Island (RI) | 28 | 6.5 | 18 | 24.5 | Cranston(15d) | Newport(38d) | 57% |
| 5 | Maine (ME) | 27 | 6.8 | 17.5 | 24.3 | Scarborough(15d) | Portland(36d) | 41% |
| 6 | Connecticut (CT) | 31 | 7.2 | 19 | 26.2 | Middletown(16d) | Greenwich(40d) | 61% |
| 7 | Pennsylvania (PA) | 38 | 7.5 | 15.5 | 23 | Lancaster(14d) | Philadelphia(37d) | 50% |
| 8 | New Jersey (NJ) | 33 | 8 | 18.5 | 26.5 | Cherry Hill(16d) | Jersey City(40d) | 64% |
| 9 | Massachusetts (MA) | 54 | 9.2 | 22 | 31.2 | Framingham(18d) | Boston(40d) | 70% |
Cities ranked by total days from permit application to PTO. All top 20 cities have online permitting and zero historic district delays.
| # | City | State | Permit Days | Interconnect Days | Total Days to PTO | Utility | Online Permit |
|---|---|---|---|---|---|---|---|
| 1 | Georgetown | TX | 2d | 6d | 8d | Georgetown Utility Systems | |
| 2 | Denton | TX | 2d | 7d | 9d | Denton Municipal Electric | |
| 3 | Cedar Park | TX | 3d | 7d | 10d | Austin Energy | |
| 4 | Round Rock | TX | 3d | 8d | 11d | Oncor | |
| 5 | Frisco | TX | 3d | 8d | 11d | Oncor | |
| 6 | Pflugerville | TX | 3d | 8d | 11d | Oncor | |
| 7 | Allen | TX | 3d | 9d | 12d | Oncor | |
| 8 | Plano | TX | 3d | 9d | 12d | Oncor | |
| 9 | Salem | NH | 3d | 9d | 12d | Eversource | |
| 10 | South Burlington | VT | 4d | 9d | 13d | GMP | |
| 11 | Garland | TX | 3d | 10d | 13d | Garland Power & Light | |
| 12 | McKinney | TX | 4d | 10d | 14d | Oncor | |
| 13 | Lancaster | PA | 5d | 9d | 14d | PPL | |
| 14 | Sugar Land | TX | 4d | 10d | 14d | CenterPoint | |
| 15 | Nashua | NH | 4d | 11d | 15d | Eversource | |
| 16 | Cranston | RI | 5d | 10d | 15d | Rhode Island Energy | |
| 17 | Scarborough | ME | 5d | 10d | 15d | CMP | |
| 18 | Cherry Hill | NJ | 5d | 11d | 16d | PSE&G | |
| 19 | Middletown | CT | 5d | 11d | 16d | Eversource | |
| 20 | Framingham | MA | 5d | 13d | 18d | Eversource |
Which utilities process solar interconnection requests fastest? Municipal utilities dominate the top spots. Larger investor-owned utilities (IOUs) tend to have longer queues.
| Rank | Utility | Avg. Interconnect Days | Cities Served | State | Type |
|---|---|---|---|---|---|
| 1 | Georgetown Utility Systems | 6d | 1 | TX | Municipal |
| 2 | Denton Municipal Electric | 7d | 1 | TX | Municipal |
| 3 | Austin Energy | 8d | 5 | TX | Municipal |
| 4 | Garland Power & Light | 9d | 1 | TX | Municipal |
| 5 | PPL | 9d | 12 | PA | IOU |
| 6 | CPS Energy | 10d | 3 | TX | Municipal |
| 7 | Oncor | 10d | 15 | TX | IOU |
| 8 | CenterPoint | 12d | 12 | TX | IOU |
| 9 | GMP | 14d | 25 | VT | IOU |
| 10 | PECO | 15d | 10 | PA | IOU |
| 11 | CMP | 16d | 20 | ME | IOU |
| 12 | Rhode Island Energy | 18d | 27 | RI | IOU |
| 13 | PSE&G | 18d | 15 | NJ | IOU |
| 14 | JCP&L | 19d | 10 | NJ | IOU |
| 15 | United Illuminating | 20d | 8 | CT | IOU |
| 16 | Eversource (CT) | 20d | 23 | CT | IOU |
| 17 | Eversource (NH) | 18d | 20 | NH | IOU |
| 18 | Eversource (MA) | 22d | 35 | MA | IOU |
| 19 | National Grid | 24d | 19 | MA | IOU |
| 20 | Versant Power | 25d | 7 | ME | IOU |
The 5 fastest utilities for interconnection are all municipal utilities in Texas. Municipal utilities process interconnection requests 40-60% faster than investor-owned utilities on average because they have simpler approval processes and fewer layers of bureaucracy. If you live in a municipal utility territory, you will likely get your system turned on weeks sooner.
Six common factors that add days or weeks to your solar timeline. Understanding these helps you anticipate delays and plan accordingly.
Adds: 4-8 weeks
Cities with historic district commissions require architectural review of solar panel placement, visibility from the street, and mounting hardware. Back Bay (Boston), Old Town (Providence), and Nantucket have the strictest requirements.
24% of cities in our dataset
Adds: 2-6 weeks
While most states have solar access laws limiting HOA interference, some HOAs still impose aesthetic requirements (all-black panels, flush mount only) that require design revisions and board approval.
Common in TX, NJ, PA suburbs
Adds: 1-3 weeks
Older homes and flat-roof multi-family buildings may require a licensed structural engineer to certify the roof can support solar. Required in most of Boston, Cambridge, and Jersey City.
15-20% of projects in dense areas
Adds: 2-8 weeks
Some utilities have processing backlogs that delay interconnection beyond their stated timelines. National Grid (MA) and Versant Power (ME) have the longest average wait times in our data.
Worst in MA and ME utilities
Adds: 1-2 weeks
Some municipalities require a separate electrical permit in addition to the building permit. This adds an extra review cycle and sometimes a second inspection.
30% of MA cities, 20% of NJ
Adds: 1-4 weeks
Coastal towns in RI, CT, ME, NJ, and TX may require enhanced wind load calculations, flood zone elevation certificates, or environmental impact review for solar installations.
Shore towns across all states
You cannot control how fast your building department processes permits, but you can eliminate the most common causes of delays.
An installer who has done 50+ projects in your city knows the building inspector, the required documents, and common rejection reasons. This alone can save 1-3 weeks.
Cities with online permitting (70% of MA, 72% of TX) process applications 30-40% faster than paper-only offices. Ask your installer if your city accepts online submissions.
If your roof is older than 15 years, get a roofer to confirm it has 10+ years of life left. A needed re-roof discovered during permitting adds 4-8 weeks and $8,000-$15,000.
If you live in a historic district, review your local historic commission rules before design. Many allow solar on rear-facing and side-facing roof planes without review.
Some utilities offer expedited review for systems under 10 kW. Eversource has a fast-track process for standard residential systems with no export limiting.
Missing property surveys, boundary disputes, or lien issues can delay permitting. Resolve these before starting your solar project.
Solar permit times vary widely by city. In our research of 316 cities across 9 states, permit approval ranges from 1-3 business days in streamlined Texas cities to 15-20 days in historic New England towns. The overall average is 7-10 business days.
Interconnection is the utility approval to connect your solar system to the grid. It takes 5-30 business days depending on the utility. Eversource averages 22-25 days in most territories, while Texas utilities like Oncor average 10-14 days.
PTO is the final approval from your utility that allows you to turn on your solar system and get credit for power you send to the grid. Total time from signed contract to PTO is typically 6-16 weeks, depending on your city and utility.
Yes. Cities with historic district overlays (Back Bay in Boston, Old Town in Providence, etc.) typically add 4-8 weeks to the permit timeline due to architectural review board approvals.
Texas has the fastest average solar permitting at approximately 4-5 business days, followed by New Hampshire at 5-6 days. Massachusetts is the slowest on average at 9-10 days, largely due to historic district requirements and dense urban permitting.
Yes. Choose an installer experienced with your local building department. Ensure your roof is in good condition before starting. Cities with online permit portals are faster. Having a recent structural engineering report can bypass review delays.
The Permit Friction Index is original research by NuWatt Energy measuring total days from permit application to Permission to Operate (PTO) across 316 cities in 9 states. It identifies which cities and utilities are fastest and slowest for solar installations.
The Permit Friction Index aggregates data from three sources:
Data reflects average conditions as of March 2026. Individual project timelines may vary based on system size, roof complexity, time of year, and local department workload. Historic district timelines are included in city averages where applicable.
Get a free instant quote from NuWatt Energy. We handle all permitting and interconnection so you do not have to.
Get Your Free Instant QuoteAverage time from quote to PTO in our fastest markets: 6-8 weeks