Spire Gulf Inc (Mobile Gas) Rate Selection Guide
Spire Gulf Inc, formerly Mobile Gas Service Corporation, distributes natural gas to roughly 83,580 customers in the Mobile, Alabama area as a subsidiary of Spire Inc., the fifth-largest publicly traded natural gas company in the US. Billing and usage data flow through Spire's unified MyAccount portal; the utility offers no Green Button, public API, or formal third-party data sharing program, so C&I teams rely on portal exports, manual authorization requests, or aggregators.
Market Overview
Spire Gulf operates as a regulated natural gas distribution utility under the jurisdiction of the Alabama Public Service Commission (APSC). Rate plans and tariffs are filed with and approved by the APSC; there is no retail gas choice program documented for Spire Gulf customers.
Need to pull your actual usage data to compare rates? See the Spire Gulf Inc (Mobile Gas) Data Access Guide →
Current Rate Schedules
Spire Gulf (the former Mobile Gas) is a natural gas distribution utility regulated by the Alabama Public Service Commission under the Rate Stabilization and Equalization (RSE) plan — a formulaic annual ratemaking process in place since 2002 in which base rates reset each December 1 based on the company's board-approved budget and an authorized return on equity (historically around 10.45-10.95%, adjusting point 10.7%). Gas commodity costs pass through dollar-for-dollar via the Purchased Gas Adjustment (PGA), on which Spire earns no return, and bills carry tax adjustment and pipeline safety riders. Large industrial customers can bypass bundled sales entirely through the T-1 Industrial Transportation Service schedule, buying their own gas and paying Spire Gulf for delivery with nomination and balancing obligations. Current rate schedules post at spireenergy.com/rates-and-tariffs (Mobile, Alabama Area) — see tariff for current per-therm figures.
Effective: December 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Commercial Sales Service (Small/Large General Service) | commercial | Commercial customers taking bundled gas supply and delivery from Spire Gulf | Monthly customer charge plus per-therm distribution charges and PGA, with tax adjustment and pipeline safety enforcement riders; RSE resets base rates each December 1 — see tariff for current rates | — |
| T-1 – Industrial Transportation Service | industrial | Industrial customers purchasing their own gas supply and using Spire Gulf's system for delivery only; daily nomination requirements apply | Per-MMBtu transportation rate per the current tariff with minimum monthly billing; imbalances between nominations and actual usage billed through TPGA-1 (system gas/storage drawn to cover overruns) and TPGA-2 (imbalance cost differential) charges; volumes above 150,000 MMBtu/month may qualify for negotiated special transportation rates with declining tiers — see tariff and contract terms | — |
| PGA – Purchased Gas Adjustment (rider) | commercial | All bundled sales customers | Dollar-for-dollar pass-through of wholesale gas and FERC-regulated pipeline transportation costs, adjusted as needed under the APSC-approved tariff; typically the largest and most volatile bill component | — |
Rate Recommendations by Use Case
Chemical plant, manufacturer, or large process gas user
Move to T-1 Industrial Transportation — buy gas competitively at the wellhead or hub and pay Spire Gulf only for distribution.
Mobile's industrial corridor sits near major supply interconnects (DCP Midstream, Williams Field Services, Southeast Supply Header), giving transportation customers genuine supplier competition. T-1 strips the PGA out of the bill, and very large loads (>150,000 MMBtu/month) can negotiate tiered special transportation rates below the standard tariff.
- Nominate accurately — TPGA-1 and TPGA-2 imbalance charges plus pipeline penalties pass through to you
- Negotiate receipt-point flexibility; nominations from some interconnects can be limited at Spire Gulf's discretion
- Benchmark your transportation rate against the standard T-1 tariff at every contract renewal
Restaurant, hotel, or mid-size commercial building
Stay on bundled commercial sales service and time efficiency investments around the December 1 RSE rate reset.
Below transportation-scale volumes, the administrative burden of daily nominations outweighs commodity savings. Because RSE allows base-rate increases only on December 1 (with mid-year adjustments limited to decreases), commercial customers get a predictable annual rate calendar to budget against.
- Re-baseline budgets each December when new RSE rates take effect
- Track the PGA line separately — it moves with the gas market, not with Spire's base rates
- Schedule boiler and water-heater tune-ups before the winter heating season
Multi-site operator with facilities across Spire territories (Alabama, Mississippi, Missouri)
Treat each Spire jurisdiction separately — Spire Gulf's RSE rates, riders, and tariff terms differ from Spire Alabama and Spire Missouri.
Spire operates under different regulatory frameworks per state: Alabama's RSE formula ratemaking versus Missouri's traditional rate cases. Rate schedules, PGA mechanics, and transportation eligibility thresholds are jurisdiction-specific, so portfolio-level gas budgeting must map each meter to its operating company tariff.
- Select the Mobile, Alabama Area tariff set at spireenergy.com/rates-and-tariffs for Spire Gulf accounts
- Watch the APSC's monthly RSE monitoring reports for early signals of December rate direction
- Centralize bill validation so rider differences across jurisdictions don't slip through
Cost Optimization Strategies
For Spire Gulf customers, gas cost optimization splits cleanly: large industrials should escape the PGA via transportation service and then manage nomination discipline, while bundled commercial customers should exploit the RSE calendar's predictability and attack consumption. The PGA is uncontrollable but transparent — every therm avoided saves the full delivered cost.
Convert qualifying load to T-1 transportation
For: Industrial customers with sufficient volume and nomination capability
Transportation customers replace the PGA with competitively procured supply from marketers at the DCP, Williams, or SESH interconnects, paying Spire Gulf only the regulated T-1 distribution rate. Loads above 150,000 MMBtu/month can negotiate declining-tier special rates beyond the standard tariff.
Maintain nomination discipline to avoid balancing charges
For: T-1 transportation customers
T-1 customers face TPGA-1 charges when Spire Gulf draws system or storage gas to cover usage above nominations, TPGA-2 charges/credits on accumulated imbalances, and pass-through of any supplier or pipeline penalties caused by the customer. Daily usage forecasting and prompt nomination adjustments are the operational core of transportation savings.
Budget around the RSE December 1 reset
For: All bundled sales customers
Under RSE, base rates can rise only on December 1; the April 1, July 1, and October 1 points of test can only produce decreases or no change. Lock budget assumptions after each December reset, and watch the APSC's monthly return monitoring for direction ahead of the reset.
Evaluate efficiency at full delivered cost
For: All sales customers
The PGA, tax adjustment rider, and pipeline safety fee stack on top of base distribution rates, so the marginal cost per therm exceeds the base tariff. Burner tune-ups, heat recovery, pipe insulation, and controls upgrades should be evaluated at the all-in rate — and verified against weather-adjusted usage since Gulf Coast heating loads swing with mild winters.
Hedge supply in shoulder seasons (transportation customers)
For: T-1 customers and prospective converts
Transportation customers control their own procurement, so they can lock fixed-price supply or basis during spring and early fall when Gulf Coast forward winter strips typically price lowest, rather than riding spot prices into the heating season.
To implement these strategies, you need your 15-minute interval data. Learn how to download Spire Gulf Inc (Mobile Gas) interval data →
Frequently Asked Questions
How do commercial customers get usage data from Spire Gulf?▾
Log into Spire's unified MyAccount portal at https://myaccount.spireenergy.com/ to view current bills, billing history, and month-by-month gas consumption charts. For raw usage exports (CSV/Excel), contact Spire Business Customer Services at 800-292-4008 — there is no self-service raw data download, and manual requests typically take 5-10 business days.
Does Spire Gulf support Green Button or a public API?▾
No. Spire Gulf is not Green Button certified, has no documented ESPI implementation (Download My Data or Connect My Data), and publishes no public REST API or developer documentation of its own. Programmatic access is available through Nectar (see docs.nectarclimate.com) or via manual authorization workflows.
How can an energy consultant access a client's Spire Gulf data?▾
Obtain the customer's signed, dated written authorization, then contact Spire Business Customer Services at 800-292-4008 with the customer's account number, your company name and tax ID, and the requested data scope. Expect a manual process with 5-10 business day turnaround; ask whether automated bill transmission is available.
What interval granularity do Spire Gulf's smart meters provide?▾
Spire is deploying ultrasonic AMI natural gas meters that transmit hourly readings — not 15- or 30-minute intervals. Today the hourly data only powers visual charts in MyAccount; raw interval exports require a formal data request through customer service.
Does Spire Gulf support EDI for supplier or billing data exchange?▾
No public EDI trading partner program is documented — no 814/820/867/810 specifications, enrollment procedures, or testing guides are published. If your operation requires EDI, contact Business Customer Services or Regulatory Affairs at 800-292-4008 with your use case to inquire about capabilities.
Is Spire Gulf the same as Spire Alabama or Spire Missouri?▾
No. Spire Gulf (formerly Mobile Gas) serves about 83,580 customers in the Mobile, Alabama area, while Spire Alabama serves the Birmingham region and Spire Missouri serves Missouri. All are subsidiaries of Spire Inc. and share the unified MyAccount portal, but they are distinct regulated utilities with separate rate plans.
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