Oklahoma Natural Gas (ONG) Rate Selection Guide
Oklahoma Natural Gas (ONG), a division of ONE Gas, Inc., is the largest natural gas distributor in Oklahoma, serving roughly 662,000 customers under Oklahoma Corporation Commission regulation. Data access is limited to a PDF-based MyAccount portal (13 months of history), API access via Nectar, and EDI for transportation suppliers; ONG does not offer Green Button or a public API.
Oklahoma Natural Gas (ONG) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| 200-SCI | Small commercial sales | $20.46/mo + $4.55990/Dth (Choice A) or $35.66/mo (Choice B) | Small businesses under 150 Dth/yr |
| 200-LCI | Large commercial sales | $131.26/mo service charge + commodity gas | Mid-size facilities 150 to <5,000 Dth/yr |
| 291-S | Large sales | $266.35/mo + $5.30901/Dth MDQ + $0.45202/Dth delivery + gas | Large facilities 5,000-30,000 Dth/yr |
| 291-T | Transportation | $403.30/mo + $5.30901/Dth MDQ + $0.45202/Dth delivery | Large users sourcing gas from a third-party supplier |
Market Overview
ONG is a regulated local distribution company under the Oklahoma Corporation Commission. Residential and small commercial customers receive bundled sales service with no supplier choice. Larger C&I customers (roughly 5,000+ Dth/year) may elect transportation service and buy the gas commodity from an OCC-approved third-party supplier while ONG provides distribution.
Need to pull your actual usage data to compare rates? See the Oklahoma Natural Gas (ONG) Data Access Guide →
Current Rate Schedules
ONG's commercial and industrial gas charges consist of a fixed monthly Service Charge plus a per-dekatherm (Dth) Delivery Fee, with the commodity cost of gas added separately under the Purchased Gas Adjustment (Tariff 1001). Larger sales and transportation schedules also include a Monthly MDQ (demand) Fee for reserved pipeline capacity. The figures below are verified from ONG's filed OCC tariffs, with current rates authorized under OCC Order No. 750859 (Case PUD2025-000011), effective July 23, 2025. All schedules are also subject to riders including the PBRC (Tariff 1201) and WESCR (Tariff 1211).
Effective: July 23, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Rate Schedule 200-SCI — Small Sales (<150 Dth/yr) | commercial | Individually metered non-residential customers with annual consumption under 150 Dth. | Verified (eff. July 23, 2025, OCC Order 750859): Rate Choice A — Service Charge $20.46/month plus Delivery Fee $4.55990 per Dth (default below 40 Dth/yr normalized). Rate Choice B — Service Charge $35.66/month, $0.00000 per Dth (default at 40+ Dth/yr). Commodity cost of gas added separately under Tariff 1001. | — |
| Rate Schedule 200-LCI — Large Sales (150 to <5,000 Dth/yr) | commercial | Individually metered non-residential customers with annual consumption of 150 Dth but less than 5,000 Dth. | Verified (eff. July 23, 2025, OCC Order 750859): Service Charge $131.26/month. Commodity cost of gas added separately under Tariff 1001; no separate published per-Dth delivery line on this sheet. | — |
| Rate Schedule 291-S — All Customers Sales (5,000 to 30,000 Dth/yr) | industrial | Individually metered non-residential customers with annual sales volume of 5,000 to 30,000 Dth (firm sales). | Verified (eff. July 23, 2025, OCC Order 750859): combined Transmission + Utility monthly fees — Service Charge $266.35, MDQ (demand) Fee $5.30901 per Dth of MDQ, Delivery Fee $0.45202 per Dth delivered. Commodity cost of gas added separately under Tariff 1001. | — |
| Rate Schedule 291-T — All Customers Transport Only (5,000 to <30,000 Dth/yr) | industrial | Transportation customers (5,000 to <30,000 Dth/yr) who buy the gas commodity from a third-party supplier; ONG provides distribution. EFM required. | Verified (eff. July 23, 2025, OCC Order 750859): combined Transmission + Utility monthly fees — Service Charge $403.30, MDQ Fee $5.30901 per Dth of MDQ, Delivery Fee $0.45202 per Dth delivered. No commodity cost (customer supplies gas). | — |
Rate Recommendations by Use Case
Small commercial gas account (under 150 Dth/yr)
Small businesses fall on 200-SCI, where the Rate Choice A/B election around 40 Dth/yr materially changes the bill.
Choice A ($20.46 + $4.55990/Dth) suits very low usage; Choice B ($35.66 flat, no per-Dth delivery) wins at higher volumes — ONG defaults the election at the 40 Dth/yr threshold.
- Compare A vs B against your annual Dth before switching
- Remember a 12-month commitment applies after switching
- Track the separate commodity (PGA) line on your bill
Mid-size commercial facility (150 to <5,000 Dth/yr)
Facilities in this band take 200-LCI, a flat $131.26/month service charge plus pass-through commodity gas.
200-LCI is the assigned sales schedule for 150 to <5,000 Dth/yr; its cost is dominated by the commodity gas line rather than distribution, so commodity-cost timing matters most.
- Monitor the PGA (commodity) line for seasonal swings
- Confirm your annual volume hasn't pushed you into 291-S
- Use Nectar to track usage across periods
Large industrial user (5,000-30,000 Dth/yr)
Large users on 291-S should manage their MDQ and weigh switching to 291-T transportation to source gas competitively.
291-S adds a $5.30901/Dth MDQ demand fee plus $0.45202/Dth delivery; an accurate EFM-based MDQ and a possible move to 291-T (buying gas from a third-party supplier) are the main savings levers.
- Use EFM data to set an accurate MDQ and avoid over-reservation
- Solicit OCC-approved supplier quotes for 291-T
- Factor the $403.30 transport service charge into the comparison
Energy manager / consultant needing data access
Without a native API or Green Button, consultants should standardize on Nectar plus written authorization for repeatable ONG data access.
Nectar is the practical programmatic path for ONG billing data (see docs.nectarclimate.com); transportation suppliers additionally get 867 EDI usage, but that requires OCC supplier approval.
- Connect client accounts through Nectar with authorization
- Use written POA for direct ONG account inquiries
- For suppliers, pursue OCC approval and EDI onboarding via business development
Historical Rate Trends
ONG rates are reset annually through the OCC's Performance Based Rate Change (PBRC) process. The current C&I tariff rates were authorized under OCC Order No. 750859 (Case PUD2025-000011), effective July 23, 2025, following prior annual orders in 2024, 2023, and 2022.
July 23, 2025
OCC Order No. 750859 (Case PUD2025-000011) set current C&I sales and transportation tariff rates.
annual PBRC adjustmentAugust 27, 2024
OCC Order No. 743688 (Case PUD2024-000010) set the prior year's tariff rates.
annual PBRC adjustmentOverall trend: Rising via annual PBRC adjustments and infrastructure recovery.
Next expected change: ONG filed a 2026 base-rate request (Case PUD2025-000010 / 2026 PBRC) seeking roughly a $28.7M increase; if approved, the average residential net impact is about $1.53/month with changes effective no earlier than late June 2026.
Cost Optimization Strategies
Because ONG distribution charges are fixed plus per-Dth with the commodity cost passed through, the biggest C&I levers are choosing the right rate class, right-sizing the MDQ on large-volume schedules, and (for the largest users) evaluating transportation service against bundled sales.
Choose the optimal sales rate class
For: All non-residential sales customers
Match annual volume to the lowest-cost schedule — e.g., 200-SCI Choice A vs Choice B switches at ~40 Dth/yr, and crossing 150 Dth or 5,000 Dth moves you between 200-SCI, 200-LCI, and 291-S.
Right-size your MDQ
For: 291-S and 291-T customers
On 291-S/T, the Monthly MDQ Fee ($5.30901/Dth) is driven by reserved daily capacity; using EFM data to establish an accurate MDQ avoids over-reserving capacity.
Evaluate transportation vs. sales service
For: C&I customers above ~5,000 Dth/yr
Large users (5,000+ Dth) can buy gas from an OCC-approved supplier under 291-T and potentially beat ONG's bundled commodity cost, while still paying ONG distribution.
Centralize data via Nectar
For: Multi-site C&I portfolios
Use Nectar to normalize ONG billing across sites for benchmarking and anomaly detection, given the lack of a native API or export — see docs.nectarclimate.com.
To implement these strategies, you need your 15-minute interval data. Learn how to download Oklahoma Natural Gas (ONG) interval data →
Frequently Asked Questions
Can we pull Oklahoma Natural Gas usage data through an API?▾
Not directly from ONG. There is no public ONG API and no Green Button. The practical programmatic path is Nectar, which (with customer authorization) normalizes ONG billing history and exposes it via REST API — see docs.nectarclimate.com. Transportation suppliers receive monthly 867 EDI usage data, but that channel is limited to OCC-approved suppliers.
How far back does Oklahoma Natural Gas billing history go online?▾
MyAccount retains 13 months of PDF statements. Older history must be requested from customer service, or accessed through Nectar, which may hold a longer collected history.
Which tariff applies to our commercial or industrial gas account?▾
ONG assigns sales-service customers by annual volume: 200-SCI for small sales (<150 Dth), 200-LCI for large sales (150 to <5,000 Dth), and 291-S for 5,000-30,000 Dth. Customers above ~5,000 Dth can instead take transportation service (e.g., 291-T) and buy gas from a third-party supplier.
Can our facility get 15-minute interval gas data?▾
Only if your meter is on ONG's limited AMR network, mostly in the Oklahoma City area. Interval data is not shown in MyAccount and must be requested from customer service; most accounts have monthly reads only.
How are ONG commercial gas charges structured?▾
ONG bills a fixed monthly Service Charge plus a per-Dth Delivery Fee, with the commodity cost of gas added separately under the Purchased Gas Adjustment (Tariff 1001). Larger sales and transportation schedules (291-S/T) add a Monthly MDQ (demand) Fee for reserved pipeline capacity. All rates are OCC-approved.
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