Insights

Growth through solar iSun has a multi-segment solar services portfolio spanning residential, commercial, industrial, municipal, and utility-scale projects, signaling upsell opportunities across market tiers with a focus on profitable growth in clean energy infrastructure.

EV charging expansion The company offers solar electric vehicle charging solutions for grid-tied and battery-backed systems, presenting cross-sell potential to customers pursuing integrated solar and EV infrastructure, including fleet and municipal programs.

Financial resilience With revenue in the mid-range and notable funding, plus recent executive restructuring and stock actions, there is an opportunity to position upsell around financing, incentives, and project optimization services to improve cash flow and project economics.

Enterprise credibility A long-standing track record with Fortune 500 clients and a history of complex installations (clean rooms, fiber optics, aerospace-related projects) supports targeting large-scale commercial and government opportunities requiring turnkey solar and electrification solutions.

Strategic partnerships Recent leadership and organizational adjustments suggest openness to collaboration; channel partnerships, EPC integrations, and co-sell arrangements with equipment manufacturers or energy service providers could accelerate market reach and project execution.

Similar companies to iSun

iSun Tech Stack

iSun uses 8 technology products and services including Cloudflare, WordPress, Shopify, and more. Explore iSun's tech stack below.

  • Cloudflare
    Content Management System
  • Content Management System
  • E-commerce
  • Live Chat
  • PHP
    Programming Languages
  • Google Analytics
    Web Analytics
  • Twitter
    Widgets

Media & News

iSun's Email Address Formats

iSun uses at least 7 email formats:
iSun Email FormatsExamplePercentage
First@isunenergy.comJohn@isunenergy.com
55%
FLast@isunenergy.comJDoe@isunenergy.com
27%
Last@isunenergy.comDoe@isunenergy.com
18%
First.Last@renewz.comJohn.Doe@renewz.com
68%
Last.First@renewz.comDoe.John@renewz.com
13%
FirstL@renewz.comJohnD@renewz.com
10%
Last.F@renewz.comDoe.J@renewz.com
9%

Frequently Asked Questions

What is iSun's stock symbol?

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iSun is a publicly traded company; the company's stock symbol is ISUN.

What is iSun's official website and social media links?

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iSun's official website is isunenergy.com and has social profiles on LinkedIn.

How much revenue does iSun generate?

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As of July 2026, iSun's annual revenue is estimated to be $25M - $50M.

What is iSun's NAICS code?

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iSun's NAICS code is 33441 - Semiconductor and Other Electronic Component Manufacturing.

How many employees does iSun have currently?

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As of July 2026, iSun has approximately 201 employees across 5 continents, including North America, Asia and Europe. Key team members include Independent Board Member: A. M., Warehouse Manager: M. T. and Project Manager Solar: S. Y. Explore iSun's employee directory with LeadIQ.

What industry does iSun belong to?

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iSun operates in the Renewable Energy Semiconductor Manufacturing industry.

What technology does iSun use?

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iSun's tech stack includes Cloudflare, WordPress, Shopify, Mailchimp, LiveChat, PHP, Google Analytics and Twitter.

What is iSun's email format?

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iSun's email format typically follows the pattern of First@isunenergy.com. Find more iSun email formats with LeadIQ.

How much funding has iSun raised to date?

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As of July 2026, iSun has raised $49M in funding. The last funding round occurred on Dec 14, 2023 for $8M.

When was iSun founded?

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iSun was founded in 1972.
iSun logo

iSun

Renewable Energy Semiconductor ManufacturingVermont, United States201-500 Employees

iSun is a mid-sized company based in Williston, Vermont, operating in the renewable energy semiconductor manufacturing sector. It traces its roots to 1972 and has worked as an electrical contractor for Fortune 500 companies, delivering projects that range from clean rooms and fiber optic installations to flight simulators and solar systems totaling more than 400 megawatts. The company provides a broad suite of solar services across residential, commercial, industrial and municipal markets, and offers solar-powered electric vehicle charging solutions for both grid-tied and battery-backed solar EV systems. 

Its customer base spans residential to utility-scale projects, with a focus on accelerating the adoption of electrification technologies and solar energy. In March 2024, iSun appointed Robert J. Zulkoski as Chief Executive Officer, marking a leadership transition as the company continues its growth-focused activities.

Section iconCompany Overview

Stock Symbol
ISUN
NAICS Code
33441 - Semiconductor and Other Electronic Component Manufacturing
Founded
1972
Employees
201-500

Section iconFunding & Financials

  • $49M

    iSun has raised a total of $49M of funding over 3 rounds. Their latest funding round was raised on Dec 14, 2023 in the amount of $8M as a Post IPO Debt.

  • $25M - $50M

    iSun's revenue is estimated to be in the range of $25M - $50M

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