Chesapeake Utilities Corporation Rate Selection Guide
Chesapeake Utilities Corporation (NYSE: CPK) is an investor-owned natural gas distribution company serving roughly 42,000 customers across Kent, Sussex, and southern New Castle counties in Delaware, with affiliated divisions in Maryland and Florida. Customer data access centers on the MiPortal self-service portal, with no Green Button, EDI, or public API programs — third-party access runs through Pool Manager authorizations and manual customer-service requests.
Chesapeake Utilities Corporation Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| GS-1 | Small commercial sales | $40.00/mo + $0.58296/therm first 52, $0.08111 over (delivery) + GSR | Small shops, offices, and restaurants under 4,143 therms/year |
| GS-2 | Mid-size commercial sales | $115.00/mo + $0.24381/therm first 207, $0.12081 over (delivery) + GSR | Mid-size facilities using 4,143–15,535 therms/year |
| GS-3 | Large C&I sales | $188.00/mo + $0.40855/therm first 1,036, $0.10119 over (delivery) + GSR | Large facilities above 15,535 therms/year |
| GS-HLFS | High load factor | $143.00/mo + flat $0.10210/therm (delivery) + GSR | Year-round flat-load process users with low winter share |
| GTS-2/GTS-3 | Transportation | Same delivery blocks as GS-2/GS-3 + retainage; commodity from third-party supplier | C&I customers wanting competitive gas supply via a Pool Manager |
Market Overview
The Delaware Public Service Commission regulates Chesapeake Utilities' delivery rates and terms of service. The utility files annual Gas Sales Service Rate (GSR) updates to pass through commodity costs; in September 2025 it filed a GSR increase of roughly 18.6% (about $16.51/month for a typical customer) effective November 1, 2025. Non-residential customers can elect Transportation Service (GTS-1/GTS-2/GTS-3) and purchase their own gas supply via Pool Managers under the tariff's Pool Manager Service (PMS) and Shipper Administrative Service (SAS) schedules, while Chesapeake continues to deliver the gas.
Need to pull your actual usage data to compare rates? See the Chesapeake Utilities Corporation Data Access Guide →
Current Rate Schedules
Chesapeake Utilities' Delaware delivery rates are set in tariff P.S.C. Del. No. 5 (Order No. 10851, Docket No. 24-0906), effective October 15, 2025. Non-residential customers are assigned to GS-1/GS-2/GS-3 sales schedules (or GTS transportation equivalents) by annual therm consumption, each with a fixed monthly customer charge and a declining two-block non-fuel energy charge. Sales customers also pay the pass-through Gas Sales Service Rate (GSR) commodity charge, updated annually; the September 2025 GSR filing raised typical bills about 18.6% effective November 1, 2025.
Effective: October 15, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| GS-1 General Service | commercial | Non-residential customers using less than 4,143 therms/year | Customer charge $40.00/meter/month; non-fuel energy charge $0.58296/therm for first 52 therms, $0.08111/therm over 52 therms; plus GSR commodity charge and billing adjustments | — |
| GS-2 General Service | commercial | Non-residential customers using 4,143 to 15,535 therms/year | Customer charge $115.00/meter/month; non-fuel energy charge $0.24381/therm for first 207 therms, $0.12081/therm over 207 therms; plus GSR commodity charge and billing adjustments | — |
| GS-3 General Service | industrial | Non-residential customers using 15,535+ therms/year; electronic metering required above 100,000 therms/year | Customer charge $188.00/meter/month; non-fuel energy charge $0.40855/therm for first 1,036 therms, $0.10119/therm over 1,036 therms; plus GSR commodity charge and billing adjustments | — |
| GTS-2 General Transportation Service | commercial | Non-residential customers using 4,143 to 15,535 therms/year who buy their own gas supply via a Pool Manager | Customer charge $115.00/meter/month; transportation charge $0.24381/therm first 207 therms, $0.12081/therm over; retainage set annually (5-year average); customer pays third-party supplier for commodity | — |
| GS-HLFS High Load Factor Service | industrial | GS-2/GS-3-eligible customers whose January–March usage is under 35% of annual consumption, using gas in at least 11 of 12 months | Customer charge $143.00/meter/month; flat non-fuel energy charge $0.10210/therm; plus GSR commodity charge and billing adjustments | — |
Rate Recommendations by Use Case
Mid-size commercial facility (4,000–15,000 therms/year)
Offices, retail, restaurants, and small institutions in the GS-2 range
GS-2's $0.12081 tail-block delivery rate is the natural fit for this volume; with the GSR up ~18.6% for 2025–26, evaluating GTS-2 transportation with a Pool Manager can hedge commodity costs.
- Confirm annual therms before the utility's schedule review reclassifies you
- Compare supplier offers against the current GSR before switching to GTS-2
- Use MiPortal monthly to track usage against the 207-therm block breakpoint
Large industrial or campus load (15,535+ therms/year)
Manufacturers, processors, healthcare, and large campuses on GS-3
GS-3's $0.10119 tail block rewards volume, and flat-load operations may qualify for GS-HLFS at a flat $0.10210/therm. Transportation via GTS-3 typically pays off at this scale.
- Check the 35% winter-share test for GS-HLFS eligibility
- Above 100,000 therms/year, plan for electronic metering at customer expense — but use the daily reads for load analysis
- Negotiate Pool Manager terms and watch for transition charges when leaving sales service
Flat-load process operation (laundry, food production, CNG fleet)
Year-round gas users with little winter heating skew
With January–March usage under 35% of annual and use in 11+ months, GS-HLFS's flat $0.10210/therm delivery beats the blended block rates on GS-2/GS-3 for most flat loads.
- Pull 12 months of usage from MiPortal to verify the winter-share test
- Pair GS-HLFTS with third-party supply for both delivery and commodity savings
- Re-verify eligibility annually — usage must stay evenly distributed
Multi-site portfolio / energy management firm
Consultants and platforms managing multiple Chesapeake accounts
Without Green Button or APIs, the tariff's Pool Manager framework is the only scalable authorized channel for portfolio usage data — and it doubles as the path to competitive supply.
- Collect letters of authorization for every account up front
- Enroll as a Pool Manager via Customer Care (800.427.2883) to receive monthly usage for all authorized accounts
- Use BEPS requests for up to 5 years of history on buildings ≥35,000 sq ft; allow up to 90 days
Historical Rate Trends
Base delivery rates were reset effective October 15, 2025 under PSC Order No. 10851 (Docket No. 24-0906). Commodity costs change annually through the GSR mechanism; the September 2025 GSR filing produced a roughly 18.6% typical-bill increase effective November 1, 2025. Pending 2026 dockets include an energy efficiency (EER) rate change effective May 1, 2026 and a Town of Ellendale franchise fee rider.
October 15, 2025
New base delivery rates effective under PSC Order No. 10851, Docket No. 24-0906 (current tariff P.S.C. Del. No. 5)
Base rate resetNovember 1, 2025
Annual Gas Sales Service Rate (GSR) commodity pass-through filed September 2025; Chesapeake estimated +$16.51/month (~18.6%) for a typical customer
+18.6%May 1, 2026
Energy efficiency (EER) rider rate change filed April 13, 2026, pending before the Delaware PSC in Docket No. 26-0448
PendingOverall trend: Rising — base rate case completed in 2025 plus a steep pass-through commodity (GSR) increase for the 2025–26 winter
Next expected change: Annual GSR filing (fall 2026); EER rider change pending in PSC Docket No. 26-0448 (effective May 1, 2026)
Cost Optimization Strategies
Chesapeake's declining-block delivery design and size-tiered schedules mean schedule assignment, load shape, and commodity sourcing are the main C&I levers. Verifying you are on the correct GS tier, qualifying for GS-HLFS, and moving to Transportation Service with a competitive supplier can each materially cut total gas cost.
Verify rate schedule assignment
For: All C&I customers
Schedules are assigned by annual therm consumption (GS-1 <4,143; GS-2 4,143–15,535; GS-3 ≥15,535) and reviewed by the utility. Confirm your annual usage places you on the lowest-cost tier, especially near breakpoints.
Qualify for GS-HLFS high load factor service
For: Year-round process loads (manufacturing, laundries, food service)
Flat-load customers with January–March usage under 35% of annual consumption and gas use in 11+ months get a flat $0.10210/therm delivery rate — well below first-block GS-2/GS-3 rates.
Switch to Transportation Service (GTS) with a Pool Manager
For: C&I customers, especially GS-2/GS-3 volumes
GTS customers buy their own gas via authorized Pool Managers instead of paying the utility's GSR commodity rate, which rose ~18.6% in November 2025. Note possible future transition charges when leaving sales service.
Track the annual GSR filing
For: All sales-service customers
The GSR resets every fall and passes through gas costs plus prior-year reconciliations. Budgeting and supplier decisions should anticipate the November effective date.
To implement these strategies, you need your 15-minute interval data. Learn how to download Chesapeake Utilities Corporation interval data →
Deregulated Market Shopping
Delaware's gas market is regulated for residential customers, but Chesapeake's tariff gives non-residential customers a supply-choice path: General Transportation Service (GTS-1/2/3) schedules let C&I customers purchase gas from third-party suppliers through authorized Pool Managers, with Chesapeake delivering it at the same tariff delivery blocks plus retainage.
How to Compare Chesapeake Utilities Corporation Suppliers
- 01Confirm eligibility — any non-residential classification can elect the matching GTS schedule
- 02Identify an authorized Pool Manager / gas supplier serving the Chesapeake Delaware system
- 03Execute a supply agreement and letter of authorization with the Pool Manager
- 04Pool Manager enrolls the account under the tariff's Pool Manager Service (PMS) / SAS schedules
- 05Compare supplier pricing against the utility's current GSR commodity rate before switching
Contract Terms for Chesapeake Utilities Corporation Supply Agreements
- Delivery charges remain the regulated GTS tariff blocks plus annually set retainage
- Commodity price, term, and balancing terms are set by the supplier/Pool Manager contract
- Imbalances are cashed out per tariff at posted unit prices
Common Pitfalls When Shopping Chesapeake Utilities Corporation Rates
- Customers leaving regulated sales service may face a future transition charge for stranded gas supply costs
- Monthly usage data flows to the Pool Manager, not to the customer in interval form
- Switching value depends on the spread versus the GSR, which reset ~18.6% higher in November 2025
Frequently Asked Questions
How can our energy management platform get usage data for commercial Chesapeake Utilities accounts?▾
There is no Green Button, API, or EDI channel. The supported routes are (1) the customer downloading PDF bills from MiPortal and sharing them, (2) enrolling as a tariff-defined Pool Manager with letters of authorization to receive monthly usage for all authorized accounts, or (3) submitting authorized data requests through Customer Care at 800.427.2883, which can take up to 90 days for BEPS-style requests.
Does Chesapeake Utilities provide interval (15-minute) gas data?▾
No. Most meters are read monthly. Large Sales Service customers (≥100,000 units/year) get remote telemetry with daily reads, and GS-3 customers above 100,000 therms/year must install electronic metering — but only daily/monthly aggregates are made available, with no third-party interval feed.
Can our business buy gas from a third-party supplier instead of Chesapeake?▾
Yes. Any non-residential customer can take General Transportation Service (GTS-1/2/3), buying gas through an authorized Pool Manager while Chesapeake delivers it at the regulated tariff blocks plus retainage. Compare supplier offers against the utility's GSR commodity rate — which rose about 18.6% in November 2025 — and note that leaving sales service may trigger a future transition charge.
Which rate schedule should our facility be on?▾
Schedules are tiered by annual consumption: GS-1 under 4,143 therms/year, GS-2 from 4,143 to 15,535, and GS-3 above 15,535. Flat-load customers with January–March usage under 35% of annual can qualify for GS-HLFS at a flat $0.10210/therm delivery rate. Chesapeake reviews assignments periodically, but verifying your own usage against the breakpoints avoids overpaying between reviews.
How do we get 5 years of usage history for ENERGY STAR or BEPS benchmarking?▾
For buildings of 35,000+ square feet, submit a BEPS data request at chpkgas.com/beps-reporting/ with an attestation of authorization. Chesapeake compiles up to five years of monthly gas usage and emails it within up to 90 days. Smaller buildings should request history through Customer Care at 800.427.2883 with written customer authorization.
What changed in Chesapeake's Delaware rates recently?▾
Base delivery rates were reset effective October 15, 2025 under PSC Order No. 10851 (Docket No. 24-0906). Separately, the annual GSR commodity filing raised typical bills about 18.6% (~$16.51/month) effective November 1, 2025, and an energy efficiency rider change is pending in Docket No. 26-0448 for May 1, 2026.
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