Yankee Gas Services Company (Eversource Energy) Rate Selection Guide
Yankee Gas Services Company, operating as Eversource Energy, is Connecticut's largest natural gas distribution company, serving roughly 187,000 customers. It offers programmatic data access via online portal, the Energy Profiler Online interval-data service, EDI for licensed suppliers, and third-party API access through UtilityAPI.
Yankee Gas Services Company (Eversource Energy) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Firm Commercial Gas Distribution | commercial | Customer charge + per-ccf delivery (see PURA tariff) | Restaurants, retail, offices, and other firm commercial gas loads |
| Firm Large General / Industrial | industrial | Customer charge + declining-block per-ccf delivery (see PURA tariff) | Manufacturing and large facilities with high firm gas demand |
| Interruptible / Transportation | industrial | Negotiated / transportation pricing per tariff | Large industrials with dual-fuel capability or self-supplied gas |
Market Overview
Connecticut natural gas supply is competitively deregulated. Commercial and industrial customers can choose a PURA-approved gas marketer for the commodity or remain on Yankee Gas regulated default supply, while Yankee Gas/Eversource always provides regulated distribution (delivery) service. PURA regulates distribution rates.
Need to pull your actual usage data to compare rates? See the Yankee Gas Services Company (Eversource Energy) Data Access Guide →
Current Rate Schedules
Yankee Gas distribution rates are regulated by PURA. On October 31, 2025 PURA issued a Final Decision approving an annual revenue requirement of $802,243,643 for the rate year November 1, 2025 through October 31, 2026 (about 12% below the company's request), with an allowed return on equity reduced to 9.32%. The decision reflects an estimated bill impact of roughly $15/month for an average customer using 54 ccf. Commercial and industrial customers take service under firm and interruptible gas distribution rate classes; specific per-ccf delivery charges and customer charges are set in the PURA-approved gas tariff. Gas commodity (supply) cost is separate and may be served by Yankee Gas default supply or a competitive marketer.
Effective: November 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Firm General (Commercial) Gas Distribution Service | commercial | Commercial firm-service gas customers | Monthly customer charge plus volumetric per-ccf delivery charge, with blocks/seasonal differentials per the PURA-approved tariff. Includes Conservation Adjustment Mechanism (CAM), System Expansion Reconciliation (SER), and Gas Supply Industry (GSI) riders. Supply commodity separate (default or competitive marketer). | — |
| Firm Large General / Industrial Gas Distribution Service | industrial | Large commercial and industrial firm-service customers | Demand-style / large-volume firm distribution structure with monthly customer charge and declining-block per-ccf delivery charges per the PURA tariff. Supply commodity separate; competitive marketer choice available. | — |
| Interruptible / Transportation Gas Service | industrial | Large industrial customers able to interrupt or transport their own gas | Interruptible distribution service with negotiated/transportation pricing for customers that arrange their own commodity supply; subject to curtailment per the PURA-approved tariff. Pricing structure defined in the tariff book rather than a fixed published rate. | — |
Rate Recommendations by Use Case
Mid-size commercial firm gas customer
Offices, retail, restaurants, and similar firm commercial loads.
Firm commercial service provides reliable distribution; the largest savings lever is shopping the deregulated gas commodity with a PURA-approved marketer.
- Compare marketer offers at CT PURA before each contract renewal
- Watch CAM, SER, and GSI riders on the delivery side
- Use the online portal's 36-month history to baseline usage
Large industrial with high firm gas demand
Manufacturing and process facilities with large, steady firm gas loads.
Declining-block delivery structure rewards high volume; commodity should be contracted competitively to manage the largest cost component.
- Negotiate a fixed or structured commodity contract to hedge winter price risk
- Use EPO interval data to verify rate-class fit
- Benchmark sites in ENERGY STAR Portfolio Manager
Dual-fuel / interruptible-capable industrial
Large industrials able to switch fuels or curtail gas on notice.
Interruptible/transportation service offers lower delivery cost in exchange for curtailment risk and is well-suited to facilities with backup fuel or self-arranged supply.
- Confirm backup-fuel readiness to absorb curtailment events
- Evaluate self-supply/transportation economics vs. firm service
- Model winter curtailment risk before committing
Energy consultant / aggregator managing C&I portfolios
Third parties managing multiple Yankee Gas C&I accounts.
Programmatic access via UtilityAPI plus EPO interval data enables portfolio-wide benchmarking, rate-fit analysis, and commodity procurement support.
- Register with UtilityAPI and collect customer authorizations
- Use EPO for interval-level analysis where meters allow
- Enroll as an EDI trading partner if performing supply enrollment
Historical Rate Trends
Yankee Gas distribution rates are reset through PURA general rate cases. The most recent Final Decision (October 31, 2025) approved an $802.2M revenue requirement for the Nov 2025-Oct 2026 rate year — about 12% below Eversource's request — and reduced the allowed ROE to 9.32%.
November 1, 2025
PURA Final Decision set the Nov 2025-Oct 2026 revenue requirement at $802.2M (about 12% below request), reduced allowed ROE to 9.32%, and reflected ~$15/month impact for an average 54-ccf residential customer.
~$82M revenue increaseOverall trend: Upward. PURA approved a multi-step distribution rate increase (an ~$82M increase widely reported), well below the company's original request, with a phased structure across the rate year.
Next expected change: Subsequent rate-year steps under the 2025 Final Decision; the next full general rate case will reset base distribution rates thereafter.
Cost Optimization Strategies
Yankee Gas C&I customers can reduce total gas cost by managing both the deregulated commodity portion (supplier choice) and the regulated delivery portion (rate-class fit, interval analysis, and efficiency).
Shop competitive gas supply
For: All C&I firm and interruptible customers
Contract the gas commodity with a PURA-approved marketer to lock pricing and potentially beat regulated default supply; compare offers at the CT PURA gas marketplace.
Evaluate interruptible / transportation service
For: Large industrials with backup fuel capability
Large industrials with dual-fuel capability may qualify for interruptible or transportation service at lower delivery cost in exchange for curtailment risk.
Interval analysis via EPO
For: Accounts with interval-recording meters
Use Energy Profiler Online interval data to identify load patterns, verify rate-class fit, and target efficiency measures.
Benchmark with ENERGY STAR Portfolio Manager
For: Multi-site commercial and institutional customers
Connect Eversource accounts to Portfolio Manager for automated monthly benchmarking and Connecticut compliance tracking.
To implement these strategies, you need your 15-minute interval data. Learn how to download Yankee Gas Services Company (Eversource Energy) interval data →
Deregulated Market Shopping
Connecticut natural gas supply is competitive. C&I customers may buy the gas commodity from a PURA-approved marketer while Yankee Gas continues to provide regulated distribution. Distribution charges, CAM, SER, and GSI riders apply regardless of supplier choice.
How to Compare Yankee Gas Services Company (Eversource Energy) Suppliers
- 01Review your current supply rate and usage (ccf) from recent Yankee Gas bills
- 02Compare PURA-approved gas marketer offers for your C&I class
- 03Confirm whether firm or interruptible/transportation service applies
- 04Execute a supply contract with the chosen marketer
- 05Marketer enrolls via EDI 814; delivery continues from Yankee Gas
Contract Terms for Yankee Gas Services Company (Eversource Energy) Supply Agreements
- Fixed vs. variable commodity pricing
- Contract length and renewal/rollover terms
- Volume/swing tolerances and balancing provisions
- Early-termination fees
Common Pitfalls When Shopping Yankee Gas Services Company (Eversource Energy) Rates
- Distribution charges and riders are not avoidable by switching suppliers
- Variable-rate contracts can spike in winter
- Watch for automatic rollover to higher variable rates at contract end
- Interruptible service carries curtailment risk
Frequently Asked Questions
Can a C&I customer in Connecticut choose their natural gas supplier?▾
Yes. Connecticut gas supply is competitively deregulated. Commercial and industrial customers may buy the gas commodity from a PURA-approved marketer or take Yankee Gas default supply, while Yankee Gas/Eversource always provides the regulated distribution service. Compare marketers via CT PURA at https://portal.ct.gov/pura/gas/gas.
How can a third party access a C&I customer's Yankee Gas usage data?▾
Three main paths: (1) UtilityAPI for OAuth-based programmatic billing/usage/interval access; (2) Energy Profiler Online (EPO) for 15/30-minute interval gas data ($50 one-time or $300/year per account); and (3) the Agency Portal for authorized representatives. EDI 867 transactions are also available to licensed suppliers.
What interval gas data is available for commercial accounts?▾
Accounts with interval-recording meters can obtain 15- or 30-minute interval consumption (plus hourly/daily summaries) through the Energy Profiler Online service, with 12-36 months of history typically available. Not all accounts have interval meters; contact Eversource to confirm meter eligibility.
Why did Yankee Gas delivery charges go up in late 2025?▾
On October 31, 2025 PURA issued a Final Decision setting Yankee Gas's Nov 2025-Oct 2026 revenue requirement at $802.2M — about 12% below the company's request — with the allowed ROE reduced to 9.32%. PURA estimated roughly a $15/month impact for an average 54-ccf customer. Delivery charges are regulated and apply regardless of your gas supplier.
Is Green Button available for Yankee Gas?▾
Green Button / Connect My Data is not currently confirmed for Yankee Gas Connecticut service. Eversource offers a Share Your Smart Meter Usage Data program in Massachusetts but not yet in Connecticut. For automated third-party access today, use UtilityAPI.
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