Capital Program Planning for Vermont Gas Utilities

by | Oct 21, 2026

Vermont · Natural Gas Utilities

One gas utility, 55,000 customers, and a climate law that questions the whole throughput curve.

Vermont Gas Systems is the only natural-gas utility in the state, serving about 55,000 customers in the northwest while the rest of Vermont heats with oil, propane, and wood. It runs a young, roughly 750-mile system anchored by a $165 million pipeline — even as the Global Warming Solutions Act and a proposed Clean Heat Standard put the long-term demand for gas itself in question. Invizion helps a small LDC like this re-sequence a capital portfolio in a click, and defend every dollar when throughput is the open question.

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The bottom line: Vermont has a single small gas utility — Vermont Gas Systems, roughly 55,000 customers — carrying a $165 million pipeline and an enforceable climate mandate that questions gas demand itself. When throughput is the open question, the capital plan that can re-sequence fastest wins.
55,6521
Natural-gas consumers statewide in 2024 — one utility, one corner of the state.
$165.6M2
Final cost of the 41-mile Addison pipeline — roughly double the original estimate.
~750 mi3
Of distribution main VGS operates across Addison, Chittenden & Franklin counties.
40%4
GHG cut below 1990 required by 2030 under Vermont's Global Warming Solutions Act — a direct question mark over gas demand.

The Vermont Landscape

Four forces are moving a single utility's project list at once

Vermont's gas sector is small, concentrated, and unusually exposed: one utility, one supply point, and a climate law that targets the fuel it sells. Each of these reshapes the capital plan on a different clock.

Safety & System Integrity

A young system — but the integrity clock still runs

VGS operates roughly 750 miles of distribution main across Addison, Chittenden, and Franklin counties.3 Unlike the cast-iron-heavy systems of older Northeast cities, most of it was built from the mid-1960s on, so legacy bare-steel and cast-iron replacement is a small part of Vermont's story.

What doesn't go away is federal distribution integrity management, leak survey, and the methane-leak rules PHMSA enforces on every LDC regardless of size.5 And the single largest integrity-and-capital event in VGS history was greenfield, not replacement: the 41-mile Addison extension that ultimately cost $165.6 million.2

Decarbonization Pressure

A climate law aimed at the product you sell

Vermont's Global Warming Solutions Act writes emission cuts into statute — 40% below 1990 by 2030 and 80% by 2050 — and makes them enforceable, not aspirational.4 For a fuel-delivery business, that is a question about throughput itself.

The proposed Clean Heat Standard, created by Act 18 of 2023, would put a clean-heat-credit obligation on heating-fuel providers, including gas; the Public Utility Commission delivered its proposed rule in January 2025 and its fate now sits with the Legislature.6 For a single small LDC, a declining-demand path turns every long-lived asset into a stranded-asset question.

Supply, Price & Reliability

One pipe in, a small market, thin buffers

Vermont's gas enters the state at essentially a single point — the Highgate interconnect with the TransCanada / TC Energy system in Canada — and the state burns only about 12.5 billion cubic feet a year, among the smallest gas markets in the country.37

With little in-state storage or supply diversity, winter design-day planning and cost volatility land directly on customers: the residential delivered price averaged about $17.34 per thousand cubic feet in 2024.8

Capital Recovery & Rates

Recover the spend without breaking affordability

VGS recovers capital through Public Utility Commission–approved rates, using an annual base-rate filing that trues up cost of service each year — the most recent order issued in August 2025.9

Every dollar of main, integrity work, or RNG supply lands on a customer base of about 55,000.1 When throughput is flat or falling, spreading fixed costs over fewer units is the affordability tension that defines the plan.

Who Delivers Vermont's Gas

One regulated utility — and, beyond it, no gas at all

Vermont is the rare state with a single natural-gas LDC and no municipal or cooperative gas systems. Outside its three-county footprint, homes heat with fuel oil, propane, and wood.

Investor-owned gas LDC

Rates & capital recovery regulated by the Vermont PUC

Vermont Gas Systems (VGS) ~55,000 customers · Chittenden, Franklin & Addison counties · the only regulated gas LDC in Vermont13
VGS — scale & workforce Reports serving 56,000+ homes & businesses across gas and its Clover Energy brand · 140+ employees10
Énergir (parent company) Québec-based energy company; VGS is its Vermont natural-gas utility

VGS recovers its capital through PUC-approved rates — and there is no second gas utility to benchmark against anywhere in the state.9

Municipal & cooperative gas

There are none — and most of Vermont heats without gas

No municipal gas utilities Vermont has zero city- or town-owned natural-gas systems
No gas cooperatives and no customer-owned gas co-ops
Fuel oil & kerosene dealers The dominant home-heating fuel across most of Vermont (unregulated)
Propane (LPG) dealers Serve rural Vermont beyond the gas main (unregulated)
Cordwood & wood pellets A meaningful share of Vermont home heat, especially off the main

Because gas reaches only three counties, VGS's real competition for the home-heating dollar is oil, propane, wood — and, increasingly, electric heat pumps and its own geothermal pilots.1

Regulation & Rate Recovery

One commission, one utility, one climate law

For VGS, the regulator, the rate mechanism, and the decarbonization mandate all run through the same small set of dockets — which makes every capital decision unusually visible.

  • Vermont Public Utility Commission (PUC) is the sole economic regulator of VGS, setting tariffs and approving cost recovery; VGS holds the only authorization to sell natural gas in the state.3
  • Annual base-rate filings let VGS true up its cost of service each year rather than through episodic rate cases, with the most recent order issued in August 2025.9
  • The Global Warming Solutions Act makes Vermont's emission targets enforceable — 40% below 1990 by 2030, 80% by 2050 — a statutory backdrop to every long-lived gas asset.4
  • The Clean Heat Standard (Act 18 of 2023) would obligate heating-fuel providers to earn clean-heat credits; the PUC filed its proposed rule in January 2025 and implementation now rests with the Legislature.6
  • Political headwinds: after the 2024 elections, legislative leaders signaled openness to changing or shelving parts of the climate program — leaving the demand outlook genuinely uncertain for long-horizon capital planning.11

Paying For The Transition

Where the capital — and the hedges — are coming from

With little federal LDC-specific grant money in play, VGS funds both its pipe and its decarbonization bets largely through rates — while piloting the low-carbon products that could define its future revenue.

  • Renewable natural gas (RNG): VGS sources RNG from in-state digesters such as Goodrich Farm in Addison County and sells it at a premium (blended RNG about $1.78 per hundred cubic feet), letting a full-participation household cut up to ~4.9 metric tons of CO₂ a year.12
  • Networked / community geothermal: with Champlain Housing Trust and Evernorth, VGS is building a community geothermal system at the 44-home Riggs Meadows development in Hinesburg (geothermal serving 36 units) — construction in 2026, residents in 2027 — a pilot for a pipe business that could sell heat, not gas.13
  • Rate-based capital recovery is the primary funding path: main, integrity work, and supply all flow through PUC-approved rates and the annual base-rate mechanism.9
  • Federal safety compliance, not grants: unlike the electric grid, there is little dedicated federal money for a small gas LDC — PHMSA integrity and leak requirements are obligations to fund, not offsets.5

Where Invizion Fits

Turn Vermont's gas-system decisions into a defensible capital plan

Invizion is scenario-based capital portfolio optimization built for utilities. When a replacement mandate accelerates, throughput forecasts shift, or a decarbonization ruling lands, you don't re-plan by hand for weeks — you model it and decide with a record to stand behind.

1

Model the “what-if” before it's forced on you

A faster main-replacement schedule, a gas-line-extension ban, an RNG mandate — build the scenario and see the impact on the whole portfolio, side by side with today's plan.

2

Re-sequence 500 projects in a click

When priorities move, Invizion re-orders the portfolio automatically — accelerating, stretching, or deferring projects against the constraints you set, not weeks of spreadsheet surgery.

3

Give regulators or your board a defensible record

Every prioritization and trade-off is captured. When you're asked “why this project, why now,” the answer is documented — not reconstructed after the fact.

Vermont Gas, In Brief

Questions Vermont gas leaders are asking

Short, sourced answers — the same facts we dig into with utilities looking at their capital programs.

How many natural gas customers does Vermont have?
About 55,000 — 55,652 gas consumers in 2024, essentially all of them served by Vermont Gas Systems in Chittenden, Franklin, and Addison counties.13
Who is Vermont's natural gas utility?
Vermont Gas Systems (VGS) is the only regulated natural-gas utility in the state; it operates about 750 miles of main and reports serving more than 56,000 homes and businesses across its gas and Clover Energy brands.310
What happened with the Addison pipeline?
VGS's 41-mile Addison Natural Gas Project ultimately cost about $165.6 million — roughly double the original estimate after repeated overruns — the largest single capital event in the utility's history.2
Does Vermont's climate law threaten gas demand?
Structurally, yes. The Global Warming Solutions Act sets enforceable cuts (40% below 1990 by 2030), and the proposed Clean Heat Standard would obligate heating-fuel providers — both point toward less fossil gas over time.46
How does VGS plan to stay relevant as gas declines?
It is leaning into renewable natural gas from Vermont digesters and piloting networked geothermal — positioning to sell low-carbon energy, and even heat, rather than only fossil gas.1213
How does Invizion help Vermont gas utilities plan capital?
Invizion is scenario-based capital portfolio optimization built for utilities. For an LDC facing an uncertain demand curve, it lets you model how a Clean Heat Standard, an RNG or geothermal investment, or a flat-throughput year reshuffles the whole project list, re-sequence the portfolio in a click, and keep a defensible record of every trade-off for the PUC.

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About the Author

GB

Guy Barlow

President, Invizion

Guy Barlow leads Invizion, a capital lifecycle management platform for water and wastewater utilities. He has spent two decades at the intersection of utility capital programs, funding, and analytics, helping utilities make faster, more defensible capital decisions.

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Invizion helps utilities model, optimize, and defend their capital programs. Explore how it works, or read our latest thinking on capital planning across the utility sector.

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This briefing was last reviewed September 2026.

Sources

  1. U.S. Energy Information Administration — Vermont Natural Gas Number of Consumers (2024: 55,652 total; 49,358 residential). www.eia.gov
  2. Addison County Independent — "Vt. Gas: Cost of pipeline now double original estimate" (41-mile Addison project, $165.6 million total), June 26, 2016. www.addisonindependent.com
  3. Vermont Public Utility Commission — Natural Gas (VGS the sole gas utility; >55,000 customers across Addison, Chittenden & Franklin counties; ~750 miles of main; supply via the Highgate/TransCanada interconnect). puc.vermont.gov
  4. Vermont Statutes — 10 V.S.A. § 578, Global Warming Solutions Act GHG targets (26% below 2005 by 2025; 40% below 1990 by 2030; 80% below 1990 by 2050). legislature.vermont.gov
  5. PHMSA — Gas Distribution annual reporting & distribution integrity management requirements for LDCs. www.phmsa.dot.gov
  6. Vermont Public Utility Commission — Clean Heat Standard (Act 18 of 2023, effective May 24, 2023; proposed rule submitted to the Legislature Jan. 15, 2025; Case 23-2221-INV). puc.vermont.gov
  7. U.S. Energy Information Administration — Vermont Natural Gas Consumption / Deliveries (~12,465 MMcf delivered to consumers, 2024). www.eia.gov
  8. U.S. Energy Information Administration — Vermont Natural Gas Prices (residential $17.34/Mcf, 2024). www.eia.gov
  9. Vermont Gas Systems — Rates (Order Approving Annual Base Rate Filing, Aug. 26, 2025). vgsvt.com
  10. Vermont Gas Systems — Who We Are (serves 56,000+ homes and businesses across gas and Clover Energy; 140+ employees). vgsvt.com
  11. Addison County Independent — "Republican gains in state legislature may force adjustments to climate policy," Jan. 9, 2025. www.addisonindependent.com
  12. Vermont Gas Systems — Renewable Natural Gas (Goodrich Farm, Addison County; blended RNG $1.7817/CCF; up to 4.9 metric tons CO₂ avoided/yr at full participation). vgsvt.com
  13. Vermont Gas Systems — VGS, Champlain Housing Trust & Evernorth community geothermal at Riggs Meadows, Hinesburg (44 residences; geothermal serving 36 units; construction 2026, occupancy 2027). vgsvt.com