Southwest Gas Corporation Rate Selection Guide
Southwest Gas Corporation is a regulated natural gas local distribution company serving roughly 2 million customers across Nevada, Arizona, and California. C&I customers access billing and monthly usage data through the MyAccount portal, with EDI and Nectar API options for automated retrieval.
Southwest Gas Corporation Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| G1 (small commercial) | Commercial | $25.80-$28.80/mo + $0.45-$0.73/therm | Small businesses, low-volume commercial gas use. |
| G2 (medium commercial) | Commercial | $135.00/mo + $0.29-$0.54/therm | Mid-size commercial with steady volume. |
| G3 (large commercial) | Commercial | $350.00/mo + $0.27-$0.55/therm | Large commercial facilities. |
| G4/G5 (industrial) | Industrial | $1,000.00/mo + $0.21-$0.48/therm + demand | High-volume industrial loads. |
| Transportation | Industrial | $500.00/mo + delivery + supplier gas | Large customers buying their own gas supply. |
Market Overview
Fully regulated LDC. Bundled sales-service rates and a transportation option for large customers; the commodity component is passed through via periodic gas cost adjustments with no markup.
Need to pull your actual usage data to compare rates? See the Southwest Gas Corporation Data Access Guide →
Current Rate Schedules
Verified from the Southwest Gas Nevada Gas Tariff Statement of Rates, with C&I (General Gas Service) Basic Service Charges and commodity (Currently Effective Tariff) rates effective April 1, 2026. Southern Nevada schedules use the SG- prefix; Northern Nevada uses NG-. Commodity rates shown are the all-in Currently Effective Tariff Rate per therm (delivery + BTER + adjustments); the underlying gas cost (BTER) is passed through and updated quarterly.
Effective: April 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| SG-G1 / NG-G1 General Gas Service - 1 | commercial | Small commercial customers (Southern NV: SG-G1; Northern NV: NG-G1). | Basic Service Charge: $25.80/mo (Southern NV) or $28.80/mo (Northern NV). Commodity charge per therm (Currently Effective Tariff Rate): $0.45386 (SG-G1) / $0.72521 (NG-G1). | $25.80-$28.80/mo + ~$0.45-$0.73/therm |
| SG-G2 / NG-G2 General Gas Service - 2 | commercial | Medium commercial customers. | Basic Service Charge: $135.00/mo. Commodity charge per therm: $0.29303 (SG-G2) / $0.53880 (NG-G2). | $135.00/mo + ~$0.29-$0.54/therm |
| SG-G3 / NG-G3 General Gas Service - 3 | commercial | Large commercial customers. | Basic Service Charge: $350.00/mo. Commodity charge per therm: $0.27363 (SG-G3) / $0.54703 (NG-G3). | $350.00/mo + ~$0.27-$0.55/therm |
| SG-G4 / NG-G4 General Gas Service - 4 | industrial | Largest general-service / industrial customers. | Basic Service Charge: $1,000.00/mo. Commodity charge per therm: $0.21180 (SG-G4) / $0.47613 (NG-G4). Demand charge: $0.03422/unit (Southern NV) / $0.01588/unit (Northern NV). | $1,000.00/mo + ~$0.21-$0.48/therm + demand+ $0.03422 (SNV) / $0.01588 (NNV) per billing determinant |
| NG-G5 General Gas Service - 5 | industrial | Very large Northern Nevada industrial customers (Mesquite Expansion Area surcharge may apply). | Basic Service Charge: $1,000.00/mo. Commodity charge per therm: $0.44047. Demand charge: $0.01833/unit. | $1,000.00/mo + ~$0.44/therm + demand+ $0.01833 per billing determinant |
| Transportation Service (T-service) | industrial | Large C&I customers who procure their own gas supply; SW Gas delivers it. | Customer pays the Basic Service Charge and Delivery Charge per therm of the otherwise-applicable schedule, plus a $500.00/mo Transportation Service Charge per qualifying premise and shrinkage charges (~$0.00111/therm). | $500.00/mo transport charge + delivery component + supplier gas cost |
Rate Recommendations by Use Case
Small commercial facility (restaurant, retail, office)
Low-to-moderate gas volume; benefits from the low fixed charge of G1.
G1 carries the lowest Basic Service Charge ($25.80-$28.80/mo), which suits modest consumption where a higher fixed charge wouldn't be offset by the lower per-therm rate.
- Export monthly usage from MyAccount to track seasonality.
- Reassess schedule if annual volume grows toward the G2 breakpoint.
Mid-size commercial (hotel, school, mid-size manufacturer)
Steady higher volume where the lower G2/G3 per-therm rates offset the larger fixed charge.
At higher consumption, the reduced commodity charge on G2 ($135/mo) or G3 ($350/mo) outweighs the higher fixed charge.
- Run a breakeven comparison between G2 and G3 at your annual therms.
- Consider EDI 810 invoicing for multi-site AP automation.
Large industrial / high-volume manufacturer
High, relatively flat gas demand; candidate for G4/G5 and transportation service.
G4/G5 offer the lowest per-therm commodity rates; transportation service can further cut commodity cost by sourcing gas directly. Watch the demand charge.
- Model transportation service vs. bundled supply with a current supplier quote.
- Manage peak demand to limit demand-charge exposure.
- Use Southwest Vista for nominations if on transportation.
Multi-site / portfolio energy manager
Manages many SW Gas premises across NV/AZ/CA and needs automated data.
Automated retrieval via Nectar or agent-authorized portal access centralizes billing and usage for benchmarking across the portfolio.
- Use Nectar's OAuth integration for hands-off monthly data (docs.nectarclimate.com).
- Maintain a renewal schedule for written agent authorizations.
- Link all premises under one MyAccount where possible.
Historical Rate Trends
Southwest Gas Nevada rates change through base rate cases (set delivery margins) and quarterly Gas Cost (QGC) adjustments that pass through the commodity cost of gas. The current Statement of Rates carries an effective date of April 1, 2026.
April 1, 2026
Current Nevada Statement of Rates effective date for delivery and tariff rates across SG-/NG- schedules.
n/aJanuary 1, 2026
Quarterly Gas Cost (QGC) rate update reflecting wholesale gas prices.
n/aOverall trend: Delivery margins are set in periodic base rate cases; the gas-cost (BTER) component fluctuates quarterly with wholesale natural gas prices. Recent statements show continued use of a negative Deferred Energy Account Adjustment offsetting prior over-collections.
Next expected change: Next quarterly Gas Cost (QGC) adjustment per the PUCN schedule.
Cost Optimization Strategies
C&I customers can reduce Southwest Gas costs by matching the rate schedule to their volume, considering transportation service at scale, and improving load efficiency.
Right-size the rate schedule
For: All commercial & industrial customers
Higher G-tiers carry larger fixed charges but lower per-therm commodity rates. Verify your account is on the schedule that minimizes total cost at your annual volume.
Evaluate transportation service
For: Large C&I customers
Large customers can buy gas directly from a supplier and pay SW Gas only delivery plus the $500/mo transport charge, potentially beating bundled commodity costs.
Reduce demand-charge exposure
For: G4/G5 industrial customers
G4/G5 schedules include a per-determinant demand charge; flattening peak gas demand lowers this component.
Efficiency and benchmarking
For: All customers
Use exported monthly usage and OPOWER analysis to target high-consumption periods and equipment for efficiency upgrades.
To implement these strategies, you need your 15-minute interval data. Learn how to download Southwest Gas Corporation interval data →
Frequently Asked Questions
How does a C&I customer get monthly usage data from Southwest Gas?▾
Log into the MyAccount portal at https://myaccount.swgas.com/, open the Usage section, and export monthly usage (in therms) to CSV or Excel. Up to 24 months of history is typically available. Multiple premises can be linked for multi-location management.
Can an energy consultant access our Southwest Gas data on our behalf?▾
Yes. Southwest Gas recognizes 'Agents' under its tariff. Execute a written authorization specifying account numbers, rights, duration, and scope, then submit it to business services. The agent receives separate MyAccount credentials limited to authorized accounts. For multiple customers, Nectar offers automated API-based access — see docs.nectarclimate.com.
Does Southwest Gas offer interval or smart-meter data for businesses?▾
Standard access is monthly. AMI is being deployed in Nevada, so availability varies by meter and territory. C&I customers needing interval/AMI data should contact business services at 877-860-6020 to confirm eligibility for their premises.
Can we receive bills via EDI?▾
Yes. Southwest Gas supports EDI (ANSI X12 / NAESB) for commercial customers, including 810 invoices, optional 820 payments, and 814 transport transactions over FTP/SFTP or VAN. Contact businessservices@swgas.com for the Trading Partner Guide and agreement.
What rate schedule applies to a commercial Southwest Gas account in Nevada?▾
Small commercial accounts take General Gas Service - 1 (SG-G1 in Southern NV, NG-G1 in Northern NV). Larger loads move up the G2-G5 tiers, which carry higher fixed Basic Service Charges but lower per-therm commodity charges, and the largest schedules (G4/G5) add a demand charge. Transportation service is available to large customers who buy gas from a supplier.
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