Budderfly is a Shelton, Connecticut company that finances, installs, and operates energy efficiency upgrades at commercial buildings under long-term service contracts, charging customers nothing upfront. The company was founded in 2007 by Al Subbloie, a serial entrepreneur who previously founded Tangoe, a telecom expense management company that IPO'd on NASDAQ in 2011. Budderfly is majority owned by Partners Group, the Swiss private markets firm, which committed more than $500 million in equity in 2022 and has backed the company's expansion from roughly 2,750 sites at the time of that investment to more than 8,500 by early 2026.
The company targets mid-market commercial customers with multiple locations and standardized building footprints — primarily franchise restaurant chains, fitness clubs, convenience stores, and healthcare facilities. By taking over the utility bill and managing the full energy infrastructure of a building, Budderfly generates revenue from the gap between what energy would have cost before its upgrades and what it costs after. The model grew from $400,000 in revenue in 2017 to a $250 million recurring run rate by 2025, averaging roughly 66% year-over-year growth for three consecutive years.
Budderfly funds the entire upfront cost of a building energy audit, system design, equipment procurement, installation, and commissioning. The customer pays nothing at signing. In exchange, the customer enters a 10-year service agreement under which Budderfly takes over the utility bill and charges the customer at a discount — typically up to 5% below what the utility was billing. Budderfly makes money from the difference between what the energy actually costs after efficiency upgrades and what it charges the customer. The savings from the installed equipment (HVAC, lighting, refrigeration, controls) are the economic engine: Budderfly captures the majority of the efficiency gains in the early contract years to recover its capital investment, then shares additional savings with the customer over the contract term.
A prerequisite for taking over a customer's utility bill across thousands of locations in 49 states is a billing system that can interface with hundreds of different utilities. Budderfly has built a patented utility billing interface that connects to more than 400 utility companies, replacing the customer's direct utility relationship with a single Budderfly bill. For multi-location operators — a franchise restaurant group with 300 locations across a dozen states — this also consolidates what were hundreds of separate utility bills into one relationship, which has administrative value independent of the energy savings.
Because Budderfly owns and controls the energy infrastructure at each site — thermostats, HVAC systems, refrigeration, lighting controls, battery storage — it can dispatch those assets as a virtual power plant without requiring any action from the customer. In June 2025, Budderfly activated a multi-region VPP across CAISO, ISO New England, PJM, and SPP, starting with HVAC curtailment across roughly 200 locations (adjusting thermostats 1 to 2 degrees at a moment's notice) and planning to expand to refrigeration, lighting, battery storage, and solar across all 8,500+ sites. Revenue from grid services creates a second income stream from the same installed asset base, and utilities pay for the flexibility that Budderfly's aggregated commercial load represents.
Budderfly's upgrades span more than 25 categories. The largest-impact measures are typically HVAC replacement (high-efficiency units with smart controls), LED lighting conversion, and refrigeration upgrades at food service sites. Additional measures include IoT sensors and metering, smart thermostats, solar PV, battery storage, and water-conserving fixtures. The mix varies by building type: a quick-service restaurant installation prioritizes HVAC, refrigeration, and cooking equipment efficiency; a fitness club installation weights toward HVAC and lighting.
Monitoring and control run through Budderfly's proprietary energy intelligence software, which tracks consumption in real time across all managed sites. In 2024, Budderfly acquired Sunverge's distributed energy resource management platform to add DERMS capability, which underpins the VPP dispatch logic. The combination of physical infrastructure (equipment at the site) and software control (centralized dispatch) is what distinguishes Budderfly from a conventional energy services company (ESCO) that installs equipment and walks away.
Budderfly's market strategy concentrates on customers with two characteristics: multiple locations with standardized footprints, and operators who want to outsource energy management entirely. Franchise restaurant chains are the archetype. A Wendy's or Subway franchisee operating 50 locations has neither the capital nor the internal expertise to audit, upgrade, and manage the energy systems across all of them — and the franchisor has no mechanism to force or fund those investments. Budderfly pitches directly to franchisees and to franchise development teams at corporate, where an energy cost reduction program has appeal as a franchisee recruitment and retention tool.
Restaurant customers include Wendy's, Subway, McDonald's, Burger King, Denny's, IHOP, Wingstop, Jersey Mike's, Church's Texas Chicken, Applebee's, Uno Pizzeria, and Jamba Juice, among others. Beyond restaurants, Budderfly serves fitness chains (OrangeTheory, LifeSpan Fitness, Choice Fitness), YMCAs, convenience stores, assisted living facilities, colleges, automotive services (Midas, Meineke), and pharmacies. The common thread is a building type that repeats at scale under a single operator or franchise system.
Edison Partners led Budderfly's $22 million initial financing in June 2017 and participated in follow-on rounds totaling approximately $84.5 million through 2019. In July 2022, Partners Group acquired a majority stake and committed more than $500 million in total equity, funding a rapid acceleration from roughly 2,750 sites to the current 8,500+. Edison Partners exited at that transaction.
The EaaS model is capital-intensive by design: Budderfly must fund the equipment and installation at every new site before recovering that investment over a 10-year contract. Debt financing is essential to the unit economics. Budderfly's debt facility started at $300 million and was upsized to $550 million in March 2026 in a transaction led by Global Infrastructure Partners (now part of BlackRock), with co-investment from Vantage Infrastructure and participation from Nuveen Energy Infrastructure Credit. The facility also includes a $100 million accordion option. Combined with the Partners Group equity, Budderfly has raised more than $1 billion in total capital.
Budderfly's stated target market is $55 billion in annual U.S. mid-market electricity spend — commercial businesses that are too small for large industrial energy programs and too operationally stretched to manage building energy themselves. At 8,500 locations and $250 million in recurring revenue, the company has captured a small fraction of that market. The growth levers are adding new franchise brands, expanding within existing brands (a franchisee with 50 locations becomes 100), and deepening the services at existing sites (adding battery storage and solar to locations where the initial upgrade was HVAC and lighting only).
The VPP builds a revenue stream that did not exist at the company's founding. With 8,500+ locations under active energy management across four ISO territories, Budderfly has one of the larger aggregated commercial DER fleets in the U.S. As it expands dispatch beyond HVAC to refrigeration, storage, and solar, the controllable capacity grows substantially. Grid operators and utilities have historically struggled to reach small commercial customers for demand response; Budderfly's aggregation model solves that access problem.
The EaaS model creates significant balance sheet obligations. Every new site requires Budderfly to fund equipment and installation — typically tens of thousands of dollars per location — and wait years to recover that outlay through the revenue spread. Scaling from 8,500 to tens of thousands of sites requires continuous access to debt capital at costs that preserve adequate margins. The $550 million debt facility is large, but continued growth will require additional debt raises. Interest rate sensitivity is real: if Budderfly's debt cost rises while energy savings margins stay fixed, the unit economics of new sites deteriorate.
Contract duration creates a different kind of risk. A 10-year agreement with a restaurant franchisee is only as good as the franchisee's continued operation of those locations. Restaurant turnover, bankruptcy, or brand exit from a franchise system can terminate sites before Budderfly has recovered its capital. Concentration in the restaurant sector also means the portfolio is exposed to the structural pressures on the QSR industry, including labor cost inflation and changing consumer behavior.
The VPP opportunity is real but early. Budderfly activated its multi-ISO VPP in June 2025, and as of early 2026 active participation covered a small share of its total installed base. Scaling grid services dispatch to the full site portfolio requires safety-tested dispatch protocols across more asset types (refrigeration curtailment carries food safety constraints that thermostat adjustment does not), continued regulatory access across ISO markets, and software reliability at a scale the company has not yet operated. The VPP is a long-term earnings addition, not a near-term certainty.
This profile was compiled from publicly available information including:
Budderfly corporate website — Service description, customer list, and company overview.
Partners Group press release (Jul 2022) — Majority stake acquisition and growth capital commitment.
Latitude Media — VPP activation, dispatch mechanics, and revenue model detail.
PV Magazine USA (Mar 2026) — $550M debt facility expansion and operational metrics.
Westfair Communications — $250M revenue run rate and growth trajectory.
This profile is for informational purposes only and does not constitute investment advice, a recommendation, or a solicitation to buy or sell any security.