Unitil Energy Systems (New Hampshire) Rate Selection Guide
Unitil Energy Systems is a regulated electric distribution IOU serving about 81,000 customers in New Hampshire. It offers strong programmatic data access (MyUnitil CSV downloads, Green Button Download My Data, and mature EDI for competitive suppliers) in a deregulated supply market with full retail energy choice. Green Button Connect My Data is in testing.
Unitil Energy Systems (New Hampshire) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Rate G-2 General Service | Commercial | Delivery ~4.22 cents/kWh + $14.86/kW + $29.19 customer charge | Small/medium C&I under 200 kVA / 100,000 kWh |
| Rate G-1 Large General Service | Industrial | Delivery ~4.28 cents/kWh + $10.29/kVA + $86.49-$162.18 customer charge | Large loads >=200 kVA / >100,000 kWh, primary/secondary voltage |
| TOU-EV G-2 | EV | Total ~13 cents (off-peak) to ~54 cents/kWh (on-peak) | Schedulable commercial EV charging |
| Default Energy Service (supply) | Supply | Fixed $0.11253/kWh (Feb-Jul 2026, G-2) + monthly variable | Customers not shopping competitive supply |
Market Overview
Restructured NH electric market with retail choice. Unitil delivers electricity (regulated distribution); customers choose their energy supply from competitive suppliers, Community Power (CCA) aggregations, or Unitil Default Energy Service. The Energy Service Charge applies to customers who return to Unitil for supply.
Need to pull your actual usage data to compare rates? See the Unitil Energy Systems (New Hampshire) Data Access Guide →
Community Choice Aggregation (CCA) Options
Municipal/county Community Power aggregation buying competitive supply on behalf of residents and businesses; Unitil delivers the power.
Current Rate Schedules
Rates below are verified from Unitil's official NH Commercial Electric Rates sheet (effective May 1, 2026). Charges separate regulated delivery (Customer, Delivery, Demand, System Benefits, Stranded Cost) from the Energy Service Charge (supply) that applies to customers on Default Energy Service. Competitive supply or Community Power replaces the Energy Service Charge.
Effective: May 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Rate G-2 General Service (Small/Medium C&I) | commercial | Standard rate for small to medium customers with average use below 200 kVA demand and/or less than 100,000 kWh/month. | Customer Charge $29.19/meter/mo; Delivery $0.04224/kWh; Demand $14.86/kW; System Benefits $0.00778/kWh; Stranded Cost $0.00001/kWh. Default Energy Service (supply) Fixed $0.11253/kWh (Feb-Jul 2026) plus monthly Variable ESC (e.g., $0.08529 May 2026). | Delivery ~4.22 cents/kWh; all-in incl. supply ~16-20 cents/kWh+ $14.86/kW |
| Rate G-1 Large General Service (Primary) | industrial | Large customers with average use at/above 200 kVA demand and/or more than 100,000 kWh/month, primary voltage. | Customer Charge $162.18/meter/mo (primary) or $86.49 (secondary); Delivery $0.04284/kWh; Demand $10.29/kVA; System Benefits $0.00778/kWh; Stranded Cost $0.00001/kWh. Monthly Variable Energy Service Charge for Default Service (e.g., $0.05652/kWh May 2026). | Delivery ~4.28 cents/kWh + $10.29/kVA demand+ $10.29/kVA |
| Rate G-2 Water/Space Heating (Restricted) | commercial | Restricted rate for existing customers with separately metered uncontrolled quick-recovery water/space heating. | Customer Charge $9.73/meter/mo (or $18.38 variant); Delivery $0.08681/kWh (or $0.11894 variant); System Benefits $0.00778/kWh; Stranded Cost $0.00001/kWh; plus Energy Service Charge. No demand charge. | Delivery ~8.68-11.89 cents/kWh+ None |
| TOU-EV G-2 (Small/Medium EV Charging) | ev | Optional time-of-use rate for small/medium customers, limited to EV charging. | Customer Charge $29.19/mo; Delivery Off-Peak $0.03715, Mid-Peak $0.04136, On-Peak $0.28235 per kWh; Demand $7.43/kW. With fixed supply, total per-kWh: Off-Peak $0.13086, Mid-Peak $0.13453, On-Peak $0.53976. | Total ~13.1 cents (off-peak) to ~54 cents/kWh (on-peak)+ $7.43/kW |
| TOU-EV G-1 (Large EV Charging) | ev | Optional time-of-use rate for large customers (>=200 kVA / >100,000 kWh/mo), limited to EV charging. | Customer Charge $162.18 (primary)/$86.49 (secondary); Delivery Off-Peak $0.01784, Mid-Peak $0.02224, On-Peak $0.27419 per kWh; Demand $5.15/kVA; plus monthly Variable Energy Service Charge. | Delivery ~1.78 cents (off-peak) to ~27 cents/kWh (on-peak) + $5.15/kVA+ $5.15/kVA |
Rate Recommendations by Use Case
Small to medium business
Offices, retail, and light commercial below 200 kVA demand or under 100,000 kWh/month.
Rate G-2 is the standard small/medium C&I delivery rate. Delivery is ~4.22 cents/kWh plus a $14.86/kW demand charge; managing peak demand and shopping competitive supply both lower the bill.
- Shop competitive supply or Community Power to beat the Default Energy Service Charge
- Flatten peak kW to reduce the $14.86/kW demand charge
- Download 24 months of CSV usage from MyUnitil to support supplier quotes
Large facility / industrial plant
Large loads at or above 200 kVA demand and/or over 100,000 kWh/month.
Rate G-1 has the lowest demand charge ($10.29/kVA) and lowest delivery energy rate, but a high customer charge ($162.18 primary / $86.49 secondary). Primary-voltage service and competitive supply procurement maximize savings.
- Take service at primary voltage where feasible to optimize the demand structure
- Procure supply competitively or via Community Power on a fixed term
- Use EDI or Green Button data to give suppliers accurate interval/usage history
Competitive supplier / aggregator
ESCOs and aggregators serving Unitil customers programmatically.
EDI (ANSI X12 V4010 via VertexOne) is the mature channel for enrollment, usage (867), and billing today. Green Button CMD will add an OAuth/ESPI API for lighter-weight, customer-authorized data sharing.
- Start EDI certification early with EL_SupplierServices@unitil.com
- Use VertexOne VXexchange for connectivity
- Monitor DE 25-025 for hourly interval and TOU data availability
Commercial EV charging operator
Businesses running EV charging who can shift load away from the 3-8 PM peak.
TOU-EV rates reward off-peak charging (delivery as low as ~1.78-3.72 cents/kWh off-peak) but penalize on-peak heavily (delivery up to ~28 cents/kWh). Best for controllable, schedulable charging.
- Schedule charging for off-peak (8 PM-6 AM weekdays, all weekend)
- Avoid the 3-8 PM on-peak window where total can reach ~54 cents/kWh (G-2)
- Use TOU interval data to verify load-shifting savings
Historical Rate Trends
Unitil NH supply rates change every six months (Feb 1 and Aug 1 for fixed Default Energy Service) plus monthly variable adjustments. The DE 25-025 rate case settlement drove a significant May 2026 increase tied to a new supply contract portfolio and distribution recovery.
May 1, 2026
NH electric rates changed May 1, 2026: typical residential bills rose ~34%, and small-to-medium business customers saw increases of roughly 20-40% by rate class/usage, tied to DE 25-025 and new supply contracts.
+20% to +40% (C&I)February 1, 2026
Fixed Energy Service Charge reset for the Feb 1-Jul 31, 2026 period to $0.11253/kWh (G-2), up from $0.11050/kWh.
+1.8% (fixed supply)Overall trend: Rising in 2026, driven by higher wholesale supply costs rolling into the Default Energy Service portfolio and distribution rate-case recovery.
Next expected change: Next fixed Default Energy Service reset Aug 1, 2026; monthly variable ESC continues; further six-month supply resets thereafter.
Cost Optimization Strategies
Because NH is deregulated, Unitil C&I customers can lower the supply portion by shopping competitive suppliers or joining Community Power, while managing demand charges and voltage level on the regulated delivery side.
Shop competitive supply / Community Power
For: All C&I
Replace Unitil's Default Energy Service Charge with a competitive supplier or a Community Power (CPCNH) program to lock a supply price and avoid volatile monthly variable charges.
Demand (kW/kVA) management
For: G-1 and G-2 demand-metered customers
Flatten peak demand to reduce demand charges ($14.86/kW on G-2, $10.29/kVA on G-1). Stagger equipment and use controls/storage.
Optimize voltage / rate class
For: Large C&I (>=200 kVA / >100,000 kWh/mo)
Large loads taking primary-voltage service on Rate G-1 get a lower demand charge ($10.29/kVA) and energy rate than G-2; confirm you are on the right class for your load.
EV load shifting (TOU-EV)
For: EV charging operators
Move controllable EV charging to off-peak windows under TOU-EV rates to capture low off-peak delivery rates and avoid the steep 3-8 PM on-peak charge.
To implement these strategies, you need your 15-minute interval data. Learn how to download Unitil Energy Systems (New Hampshire) interval data →
Deregulated Market Shopping
New Hampshire offers full retail electric choice. Unitil delivers the power regardless of supplier; you can buy energy supply from a competitive supplier, a Community Power (CCA) program like CPCNH, or stay on Unitil Default Energy Service. Switching suppliers does not change Unitil's delivery charges or reliability.
How to Compare Unitil Energy Systems (New Hampshire) Suppliers
- 01Pull 12-24 months of usage from MyUnitil (CSV or Green Button) to get accurate supplier quotes
- 02Compare competitive supplier offers and the local Community Power (CPCNH) rate against Unitil's Default Energy Service Charge
- 03Check the NH PUC for licensed competitive suppliers and current default rates
- 04Enroll with the chosen supplier; they handle the switch via EDI with Unitil
- 05Confirm the supply charge replaces the Energy Service Charge on your Unitil bill
Contract Terms for Unitil Energy Systems (New Hampshire) Supply Agreements
- Fixed vs variable supply price and term length (e.g., 6/12/24 months)
- Whether the rate is all-in per-kWh or has separate charges
- Early termination fees and renewal/rollover terms
- Whether Community Power offers a comparable or greener default option
Common Pitfalls When Shopping Unitil Energy Systems (New Hampshire) Rates
- Variable-rate plans can spike (Unitil's own variable ESC hit ~$0.17/kWh in Feb 2026)
- Teaser rates that roll to high variable rates after the intro period
- Early termination fees on fixed contracts
- Confirm the supplier is licensed in NH and reports usage via EDI
Frequently Asked Questions
Can I download my Unitil usage data in bulk for energy analysis?▾
Yes. MyUnitil supports CSV downloads of billed usage, payment history, and billing history for up to 24 months, including a multi-account download that consolidates many sites into one file. Green Button Download My Data also exports standardized ESPI XML for electric customers.
How does a competitive supplier or aggregator get programmatic access to Unitil data?▾
Through Unitil's EDI program (ANSI X12 V4010 via VertexOne VXexchange). Suppliers sign a Trading Partner Agreement, complete testing/certification, and then exchange 814 (enrollment/usage requests), 867 (usage), 810 (invoices), and 820 (payments). Contact EL_SupplierServices@unitil.com to start.
Is interval (hourly/15-minute) data available to C&I customers?▾
Daily usage is available today for smart-meter customers. Hourly and 15-minute interval data, plus a new hourly load-settlement platform, are committed under rate case DE 25-025 and expected with the NH AMI rollout in 2026-2027.
Which delivery rate applies to my business?▾
Rate G-2 is the standard for small/medium customers below 200 kVA demand and under 100,000 kWh/month (demand charge $14.86/kW). Rate G-1 is the large general service rate for customers at or above 200 kVA and/or over 100,000 kWh/month (demand $10.29/kVA), available at primary or secondary voltage.
Can I choose my electricity supplier on Unitil?▾
Yes. New Hampshire is deregulated, so you can buy energy supply from a competitive supplier or a Community Power (CPCNH) program while Unitil continues to deliver the power. If you do nothing, you stay on Unitil's Default Energy Service Charge, which has a fixed semi-annual and a monthly variable component.
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