Southern California Gas Company (SoCalGas) Rate Selection Guide
Southern California Gas Company (SoCalGas), a Sempra subsidiary, is the largest natural gas distribution utility in the US, serving roughly 2.9 million gas meters across Central and Southern California. For C&I customers, SoCalGas offers 24 months of billing history via My Account, hourly AMI usage through the Analyze Usage tool with Green Button export, and benchmarking data delivery to ENERGY STAR Portfolio Manager. Third-party programmatic access runs primarily through aggregators like UtilityAPI rather than a native API.
Southern California Gas Company (SoCalGas) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| GN-10 (Core) | Bundled core | Per-therm transport margin + procurement charge | Commercial/EG customers wanting SoCalGas to procure gas |
| G-10 / GT-10 | Transportation only | Per-therm transportation (no commodity) | Noncore C&I buying their own gas via an ESP |
| GT-F (Firm Transport) | Firm transportation | Per-therm firm transport, no curtailment | Large noncore C&I needing reliable, non-interruptible service |
| GT-I (Interruptible) | Interruptible transportation | Discounted per-therm transport (curtailable) | Noncore C&I that can curtail to save on transport |
| GM (Multi-Family) | Bundled commercial | Per-therm transport margin + procurement | Master-metered multi-family / commercial properties |
Market Overview
SoCalGas is a regulated gas distribution utility under CPUC oversight. Through the Core Aggregation Transportation (CAT) program, eligible residential, small commercial (<250,000 therms/year), and natural gas vehicle customers can choose a Core Transport Agent (CTA) for gas supply while SoCalGas provides transportation. A consolidated single-bill option is expected in 2026.
Need to pull your actual usage data to compare rates? See the Southern California Gas Company (SoCalGas) Data Access Guide →
Community Choice Aggregation (CCA) Options
Lets eligible customers choose a registered Core Transport Agent (CTA) for natural gas supply while SoCalGas delivers it.
Current Rate Schedules
Southern California Gas Company (SoCalGas) is a CPUC-regulated gas distribution utility. Commercial and industrial customers fall into two classes: core (smaller firm customers whose gas SoCalGas procures, billed on bundled rates) and noncore (large C&I, generally >250 Mcf/day, that typically buy their own gas and pay transportation-only rates). Bills combine a CPUC-set transportation/distribution margin with a procurement (commodity) charge for core customers. SoCalGas margin is allocated across core, noncore and backbone transportation markets. Rate Schedule G-10 (containing core option GN-10 and transportation option GT-10) serves electric-generation and certain commercial loads; noncore C&I take firm (GT-F) or interruptible (GT-I) transportation; Schedule GM covers multi-family service. Rates reflect the 2024 GRC decision (Dec 19, 2024) and annual attrition increases through 2027.
Effective: February 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| GN-10 — Core (within Rate Schedule G-10) | bundled core (transport + procurement) | Eligible commercial and electric-generation customers (e.g., EG capacity ≤1 MW) electing core service for 100% of load. | Bundled core rate: CPUC-authorized transportation/distribution margin plus a procurement (commodity) charge for the gas SoCalGas buys on the customer's behalf. Core election generally carries a multi-year commitment. | Per-therm transportation margin plus procurement charge per the G-10 tariff sheet (specific therm rates set in tariff)+ None (volumetric per-therm) |
| G-10 / GT-10 — Transportation (Core Aggregation) | transportation only | Noncore commercial/industrial customers receiving core transportation via an ESP under the Core Aggregation Transportation (CAT) program, and EG customers electing transportation. | Transportation-only (distribution) charge per therm; the customer (or its ESP) procures the gas commodity separately. Lower than bundled core rates because no SoCalGas procurement is included. | Per-therm transportation charge per the G-10 tariff sheet+ None (volumetric) |
| GT-F — Firm Transportation Service | firm transportation (noncore) | Large noncore C&I customers (generally >250 Mcf/day) wanting firm, non-interruptible transportation while procuring their own gas. | Firm transportation/distribution charge per therm with no commodity component; firm service is not subject to curtailment. Customer arranges supply and interstate capacity. | Per-therm firm transportation charge per SoCalGas noncore tariff+ None; reservation/firm charges per tariff |
| GT-I — Interruptible Transportation Service | interruptible transportation (noncore) | Noncore C&I customers with curtailable load that accept interruption in exchange for lower transportation rates. | Interruptible transportation charge per therm at a discount to firm GT-F; service may be curtailed during system constraints. Customer procures its own gas. | Discounted per-therm transportation charge vs GT-F per noncore tariff+ None; interruptible (curtailable) |
| GM — Multi-Family / Master-Metered Service | bundled commercial (multi-family) | Master-metered multi-family and certain commercial properties (rates GM-E, GM-C, GM-EC, GM-CC and GT-M transport variants). | Bundled per-therm transportation margin plus procurement for master-metered service, with sub-rates by usage/voltage category; transportation-only GT-M variants available. | Per-therm bundled rate per the GM tariff schedule+ None (volumetric) |
| G-NGV — Natural Gas Vehicle (Commercial Fueling) | compression/fueling service | Commercial customers operating natural-gas-vehicle fueling stations. | Per-therm transportation/distribution charge for gas used at NGV fueling stations; separate commodity per market class. | Per-therm NGV rate per SoCalGas tariff+ None (volumetric) |
Rate Recommendations by Use Case
Benchmark a commercial building portfolio
Use SoCalGas Portfolio Manager Web Services to automatically receive building-level gas usage for ENERGY STAR benchmarking and AB 802 compliance.
Auto-uploaded monthly data eliminates manual bill entry across a portfolio.
- Submit benchmarking requests by March 1 for full prior-year data
- Email SCGBenchmarking@semprautilities.com for connection issues
Automate billing data into energy software
Connect a UtilityAPI-backed platform to pull SoCalGas billing, usage, and tariff data programmatically with customer authorization.
No native API exists; UtilityAPI provides daily-synced normalized data.
- Use Utility ID SoCalGas
- Handle unexpected tariff names gracefully via known_tariffs_json
Analyze hourly gas usage for conservation
Export hourly and daily interval data from the Analyze Usage tool via Green Button to identify peak consumption and target efficiency measures.
Hourly AMI data reveals consumption patterns not visible in monthly bills.
- Data is available next-day
- Export up to one year per download
Procure competitive gas supply
Eligible C&I customers can choose a registered Core Transport Agent through the CAT program to potentially lower commodity costs.
CAT supplier choice separates the commodity charge from regulated transportation.
- Review participating CTAs before enrolling
- A consolidated single-bill option is expected in 2026
Historical Rate Trends
On December 19, 2024 the CPUC adopted the Sempra/SoCalGas 2024 General Rate Case (A.22-05-015/016). The 2024 test-year revenue requirement was set at $3.806 billion — $628.7M below SoCalGas's request — an increase of $323.6M (9.3%) over 2023. The decision authorized annual attrition increases for 2024-2027.
December 19, 2024
CPUC adopted the SoCalGas 2024 GRC: 2024 revenue requirement $3.806B, a $323.6M (9.3%) increase over 2023 (the 2024 step was ~$267M / 10.5%).
+9.3% (2024 revenue requirement vs 2023)January 1, 2025
2025 GRC attrition increase of $110.3M (~3.94%).
~3.94%January 1, 2026
2026 GRC attrition increase of $115M (~3.95%).
~3.95%Overall trend: Rising — multi-year GRC trajectory with annual attrition increases of roughly 3.9-4% per year through 2027.
Next expected change: Annual GRC attrition increase of ~3.95% (~$119.5M) in 2027, plus periodic commodity/procurement (G-PCA) updates; the next full GRC cycle follows 2027.
Cost Optimization Strategies
SoCalGas C&I savings come from choosing the right core/noncore class and transportation option, self-procuring gas where volumes justify it, and using interruptible service for curtailable load.
Evaluate noncore transportation self-procurement
For: Large noncore C&I customers
Large customers (>250 Mcf/day) can leave bundled core service, buy gas directly or via an ESP/marketer, and pay transportation-only rates — often beating bundled procurement.
Use interruptible transportation (GT-I)
For: Noncore C&I with sheddable gas load
Customers with curtailable processes can take GT-I at a discount to firm GT-F, accepting occasional curtailment.
Right-size core vs noncore election
For: All commercial gas accounts near the core/noncore boundary
Confirm whether bundled core (GN-10) or transportation (G-10/GT-10/CAT) best fits load size and risk tolerance before committing to multi-year core service.
Hedge commodity / monitor G-PCA
For: Noncore / transportation customers
Self-procuring customers can hedge gas purchases and track procurement (G-PCA) factors to manage commodity volatility separate from the fixed transportation margin.
Efficiency and load reduction
For: All C&I gas customers
Since pricing is volumetric per therm, cutting throughput via efficiency, electrification or recovery directly reduces both transport and commodity costs.
To implement these strategies, you need your 15-minute interval data. Learn how to download Southern California Gas Company (SoCalGas) interval data →
Frequently Asked Questions
Does SoCalGas offer a Green Button data export for my business?▾
Yes. Through the Analyze Usage tool in My Account, C&I customers can export hourly and daily gas usage in ESPI-compliant Atom+XML or CSV via the Green Button link below the usage graph. Note that automated Green Button Connect My Data (CMD) is limited; automated third-party sharing runs through Portfolio Manager or aggregators.
How can a consultant access our SoCalGas billing data programmatically?▾
SoCalGas has no native API. Consultants typically use a UtilityAPI-connected platform (Utility ID: SoCalGas) after the customer authorizes My Account access, providing daily-synced billing, usage, and tariff data.
How do we get building gas usage into ENERGY STAR Portfolio Manager?▾
Enroll in SoCalGas Portfolio Manager Web Services: create a Portfolio Manager property, connect to SoCalGas, and submit a request at eebenchmarking.socalgas.com/ab802/. SoCalGas then auto-uploads aggregated monthly usage, refreshed monthly. Initial data delivery takes 3-6 weeks.
Can our facility choose its natural gas supplier?▾
Eligible residential, small commercial (under 250,000 therms/year), and NGV customers can choose a registered Core Transport Agent (CTA) under the Core Aggregation Transportation (CAT) program, while SoCalGas continues to provide transportation. A consolidated single-bill option is expected to launch in 2026.
How much billing history can we access online?▾
My Account provides 24 months of billing records, viewable and downloadable as PDF. Older records can be requested by phone or mail with 3-5 business day processing.
Automate Southern California Gas Company (SoCalGas) Rate Analysis with Nectar
Nectar continuously monitors your Southern California Gas Company (SoCalGas) rate options and alerts you when a better schedule is available. Save 10-30% on energy costs.
Nectar for Energy & Sustainability Teams
Managing utility costs for commercial or industrial buildings? Nectar offers a free rate analysis — we'll review your current rate schedules and identify where switching tariffs or shifting load can save 10-30%.
Get a Free Rate AnalysisNectar for Energy Brokers & Consultants
Advising clients on rate optimization? Nectar works with energy consultants who need reliable interval data and automated rate comparison tools.
Partner with Us