The Southern Connecticut Gas Company Rate Selection Guide
The Southern Connecticut Gas Company (SCG), an Avangrid subsidiary, is a natural gas local distribution company serving roughly 200,000 customers in the greater New Haven and Bridgeport areas. SCG offers billing and hourly interval data through its My Account portal and Energy Analyzer (PDF/CSV/XML export) and supports gas marketers via its Marketer Services portal, but does not implement Green Button.
The Southern Connecticut Gas Company Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| SGS | Commercial | Customer charge + per-Ccf distribution (see tariff) | Smaller commercial gas loads |
| MGS | Commercial | Customer charge + per-Ccf distribution (see tariff) | Mid-size commercial loads |
| LGS | Industrial | Customer/demand + per-Ccf distribution (see tariff) | Large loads > 30,000 Ccf/yr |
| IS | Industrial | Interruptible distribution pricing (see tariff) | Curtailable / dual-fuel loads |
| TRS | Transportation | Transportation + balancing charges (see tariff) | Customers shopping third-party supply |
Market Overview
SCG's gas distribution is regulated by PURA, while the gas commodity is open to competition. Commercial and industrial customers may purchase supply from a registered marketer (transportation customers) or take SCG's bundled sales service. SCG runs a formal Become a Marketer / Transportation Receipt Service program. Distribution charges set in the PURA-approved tariff are not avoidable.
Need to pull your actual usage data to compare rates? See the The Southern Connecticut Gas Company Data Access Guide →
Current Rate Schedules
SCG distribution rates are set in its PURA-approved gas tariff and organized by customer class. The 2025 On-Main and System Expansion rate schedule lists RSG/RSH (residential), SGS, MGS and LGS (general service), IS (interruptible) and transportation rates (TRS, BAL, STB), with the SGS/MGS/LGS schedules effective November 1, 2025. Exact per-Ccf distribution charges and monthly customer charges are published only in the individual rate sheets (see tariff book). As a verified delivered-price benchmark, EIA reports Connecticut commercial gas at $12.69 and industrial gas at $9.78 per thousand cubic feet for March 2026.
Effective: November 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| SGS — Small General Service | commercial | Smaller commercial accounts. Monthly customer charge plus a per-Ccf distribution charge; commodity bundled or shopped. Distribution rate per the PURA tariff sheet. | Customer charge + per-Ccf distribution charge (see tariff sheet). Effective Nov 1, 2025. | — |
| MGS — Medium General Service | commercial | Mid-size commercial accounts above the SGS threshold. Customer charge plus tiered/seasonal per-Ccf distribution charges per the PURA tariff. | Customer charge + per-Ccf distribution charge (see tariff sheet). Effective Nov 1, 2025. | — |
| LGS — Large General Service | industrial | Large customers, generally > 30,000 Ccf/yr, with daily demand metering. Customer/demand charge plus per-Ccf distribution charge; firm transportation election available. | Customer/demand charge + per-Ccf distribution charge; firm vs. interruptible transportation options (see LGS tariff sheet). Effective Nov 1, 2025. | — |
| IS — Manual Interruptible Service | industrial | Large interruptible loads that can curtail on SCG's request, typically with dual-fuel capability. Per the PURA tariff (effective Dec 1, 2024). | Interruptible distribution pricing per the PURA tariff sheet. | — |
| TRS — Transportation Receipt Service | industrial | Customers/marketers delivering third-party-supplied gas through SCG's distribution system. | Transportation distribution charges plus balancing; per the TRS rate sheet and appendix. | — |
Rate Recommendations by Use Case
Large industrial gas user (> 30,000 Ccf/yr)
On LGS with daily demand metering, optimize both the transportation election and competitive supply.
Large volumes make commodity shopping and firm/interruptible election the biggest levers.
- Export Energy Analyzer data to build a load profile for supplier RFPs
- Evaluate firm vs. interruptible transportation against curtailment tolerance
- Confirm the LGS tariff distribution charge in the current rate sheet
Mid-size commercial facility
On SGS or MGS, shopping the commodity and confirming correct class are the main savings paths.
Distribution is regulated; competitive supply and correct classification drive cost.
- Compare registered marketer offers vs. default sales service
- Verify SGS vs. MGS fit based on annual volume
- Use Energy Analyzer exports to support negotiations
Energy manager / consultant needing data
No Green Button or API; use My Account authorized-user access and Energy Analyzer exports.
Authorized-user access under 16-47a-3 is the supported third-party path.
- Have the customer sign the disclosure authorization and add you as a user
- Export hourly data as CSV/XML from Energy Analyzer
- For supply work, consider Become a Marketer enrollment
Historical Rate Trends
SCG's distribution rates are reset in PURA rate proceedings and via the periodic Purchased Gas Adjustment (PGA) for the commodity. The 2025 On-Main and System Expansion schedule moved residential rates effective May 1, 2025 and general-service classes (SGS/MGS/LGS) effective November 1, 2025. EIA delivered prices show Connecticut commercial gas ranging roughly $8.78-$13.68/Mcf across 2025.
November 1, 2025
2025 rate schedule effective dates for general-service classes: SGS, MGS and LGS distribution rates effective November 1, 2025 (per SCG pricing page).
see tariff (figures in rate sheets)May 1, 2025
Residential service classes (RSG, RSH, RSH-SE) effective May 1, 2025 under the 2025 rate schedule.
see tariff (figures in rate sheets)Overall trend: Seasonal and PGA-driven volatility on the commodity; distribution charges step-change at PURA rate-case and annual-schedule effective dates.
Next expected change: Commodity PGA updates periodically; distribution changes follow the next PURA proceeding or annual rate schedule. Monitor the SCG pricing page and PURA dockets.
Cost Optimization Strategies
For SCG C&I customers, the two levers are shopping the competitive gas commodity and optimizing the regulated distribution class and metering. Interval data from Energy Analyzer supports load profiling and supplier negotiations.
Shop the gas commodity
For: All C&I (SGS/MGS/LGS)
Solicit competitive supply offers from registered CT marketers and lock favorable fixed pricing; SCG continues regulated delivery.
Interruptible / dual-fuel service
For: IS-eligible industrial loads
Loads able to curtail or switch fuels can take Interruptible Service (IS) for lower distribution pricing in exchange for curtailment obligations.
Rate-class and metering review
For: All C&I
Confirm the account is on the lowest-cost applicable class (SGS/MGS/LGS) given annual volume and demand; LGS requires daily demand metering above 30,000 Ccf/yr.
Interval-data load profiling
For: All C&I
Export hourly Energy Analyzer data (CSV/XML) to build a load profile for supplier RFPs and to target efficiency on peak winter days.
To implement these strategies, you need your 15-minute interval data. Learn how to download The Southern Connecticut Gas Company interval data →
Deregulated Market Shopping
Connecticut natural gas supply is competitive. C&I customers can buy the gas commodity from a registered third-party marketer/supplier while SCG continues to deliver it through its regulated distribution system. Only the supply portion of the bill is shoppable; PURA-approved distribution charges remain.
How to Compare The Southern Connecticut Gas Company Suppliers
- 01Review the list of registered marketers/suppliers on SCG's Suppliers & Partners pages
- 02Compare per-therm/per-Ccf supply offers and contract terms
- 03Enroll directly with the chosen marketer; SCG continues distribution and billing
- 04Large customers can act as their own operator via the Become a Marketer / TRS program
Contract Terms for The Southern Connecticut Gas Company Supply Agreements
- Fixed or variable supply pricing depending on the marketer
- Term lengths vary (month-to-month to multi-year)
- Firm vs. interruptible transportation election for large/eligible loads
- Maximum Daily Quantity (MDQ) and facility requirements for firm transportation
Common Pitfalls When Shopping The Southern Connecticut Gas Company Rates
- Distribution (delivery) charges are not avoidable by switching supply
- Variable-rate supply can spike during winter demand peaks
- Imbalance and balancing charges may apply to transportation customers
- Early-termination fees may apply to fixed-term supply contracts
Frequently Asked Questions
How does a C&I customer get interval gas data from SCG?▾
Use the Energy Analyzer inside My Account. It provides hourly consumption with weather overlay and exports to PDF, CSV or XML, with 12-13 months of history. There is no Green Button export; for very large accounts, daily demand-metering data is available and custom requests can be made via Customer Care.
Can an energy consultant access an SCG account on the customer's behalf?▾
Yes. Under Connecticut's Gas Code of Conduct (16-47a-3) the customer signs a Customer Information Disclosure Authorization and adds the consultant as an authorized user in My Account. The consultant then logs in with their own credentials to view bills and export Energy Analyzer data.
Can a commercial customer choose its gas supplier?▾
Yes. Connecticut gas supply is competitive, so a C&I customer can buy the gas commodity from a registered marketer while SCG continues to provide regulated distribution. The distribution (delivery) charges in SCG's PURA-approved tariff still apply regardless of supplier.
Which rate class applies to a large commercial or industrial site?▾
SCG assigns class by usage/demand: Small General Service (SGS), Medium General Service (MGS) and Large General Service (LGS, generally >30,000 Ccf/yr with daily demand metering), plus Interruptible Service (IS). Exact distribution charges per Ccf and the monthly customer charge are set in the PURA-approved tariff (see the LGS/MGS rate sheets).
Does SCG publish an API for usage data?▾
No. There is no public developer API or Green Button Connect My Data. Programmatic-style access is limited to Energy Analyzer CSV/XML exports, the Marketer Services portal for enrolled suppliers, or custom data feeds requested through Customer Care or Transportation Services.
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