Central Maine Power (CMP) Rate Selection Guide
Central Maine Power (CMP), an Avangrid company, is Maine's largest electric transmission-and-distribution utility. With 622,000+ AMI smart meters deployed, CMP offers Green Button (Download My Data) CSV/XML exports, an Energy Manager portal, Interval Usage Web for C&I, EDI 867 for licensed suppliers, and the Electricity Supplier Marketplace for third-party data access.
Central Maine Power (CMP) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| Small General Service (SGS) | commercial | Customer charge + per-kWh delivery; no demand charge (see rate index) | Small businesses under 20 kW demand |
| Medium General Service (MGS) | commercial | Delivery (customer + distribution + demand) plus Standard Offer supply (verified 2026 monthly, e.g. $0.0876-$0.1952/kWh) | Mid-size commercial, 20-400 kW |
| Large / Primary General Service (LGS) | industrial | Demand-based delivery + monthly wholesale-indexed Standard Offer supply | Industrial / large commercial over 400 kW |
Market Overview
Maine deregulated electricity supply in 2000. CMP delivers power under MPUC-regulated delivery rates, while supply is competitive. C&I customers default to Standard Offer supply (set annually by MPUC competitive bid, by customer class) or choose a licensed Competitive Electricity Provider. Large non-residential standard offer is indexed monthly to wholesale prices.
Need to pull your actual usage data to compare rates? See the Central Maine Power (CMP) Data Access Guide →
Community Choice Aggregation (CCA) Options
A consumer-owned cooperative aggregator offering alternative supply/delivery options to Maine customers.
Current Rate Schedules
A CMP electric bill has two parts: regulated delivery (set by MPUC) and competitive supply (Standard Offer or a chosen supplier). Verified figures below include the residential Rate A delivery rate and the 2026 Medium non-residential Standard Offer supply prices. C&I delivery is segmented by demand (SGS/MGS/LGS); specific delivery per-kWh and per-kW charges are published in CMP's rate schedule index (cited).
Effective: January 1, 2026 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Small General Service (SGS) - Delivery | commercial | Non-residential customers with demand under 20 kW. | Delivery-only rate with a customer charge plus per-kWh distribution; no demand charge for this class. Specific per-kWh delivery figures are in CMP's filed SGS schedule and rate index (cited); not independently re-verified to the cent here. Supply is Standard Offer (small non-residential) or a competitive provider. | — |
| Medium General Service (MGS) - Delivery + Standard Offer supply | commercial | Non-residential customers with demand of 20-400 kW. | Delivery includes a customer charge, per-kWh distribution, and a demand charge (per the filed MGS schedule). Verified 2026 Medium-class Standard Offer SUPPLY prices vary by month (MPUC Docket 2025-00157): e.g., $0.195198/kWh (Jan), $0.087608 (May), $0.155214 (Dec) — averaging in the low-to-mid teens of cents per kWh across the year. Delivery charges are separate and per the CMP rate index. | — |
| Large / Primary General Service (LGS) - Delivery + indexed Standard Offer | industrial | Non-residential customers with demand greater than 400 kW. | Demand-driven delivery rate with customer, distribution, and demand charges (filed LGS schedule). Large non-residential Standard Offer SUPPLY is indexed to wholesale market prices and set in advance each month rather than a fixed annual rate. Eligible for Interval Usage Web. Specific delivery figures per CMP rate index (cited). | — |
Rate Recommendations by Use Case
Large industrial facility (>400 kW)
LGS customers should secure Interval Usage Web access, manage peak demand, and actively shop supply since their Standard Offer is wholesale-indexed monthly.
Demand-driven delivery plus monthly-indexed supply means both demand control and a competitive supply contract directly reduce cost and volatility.
- Request Interval Usage Web from Business Services (1-800-565-3181)
- Lock a competitive supply contract to avoid indexed volatility
- Use EDI 867 or ESM (via supplier) for automated usage feeds
Mid-size commercial (20-400 kW)
MGS customers should benchmark competitive supply against the verified 2026 Medium Standard Offer schedule and watch winter peaks.
Medium-class Standard Offer ranges from ~$0.088 (May) to $0.195/kWh (Jan), so a flat competitive contract can smooth and lower winter costs.
- Compare CEP offers to the monthly Standard Offer schedule
- Use Energy Manager Business for TOU and multi-facility analysis
- Manage demand to control MGS demand charges
Small business / multi-site (<20 kW)
SGS customers (no demand charge) should focus on shopping supply and using Green Button data to compare offers across sites.
Without a demand charge, supply price dominates; Green Button CSV/XML makes it easy to model competitive offers per location.
- Download 13 months of hourly data via Download My Data
- Compare a competitive supplier vs. small non-residential Standard Offer
- Use eBill for 36 months of billing history
Historical Rate Trends
Maine standard offer supply prices are reset annually by MPUC competitive bid and have swung sharply with New England wholesale gas markets; delivery rates change via CMP rate cases and annual adjustments.
January 1, 2026
Residential Rate A delivery rate increased about 4% to $0.136474/kWh effective January 1, 2026 (MPUC).
+4%January 1, 2026
2026 Medium non-residential Standard Offer supply prices set by MPUC (Docket 2025-00157), ranging from $0.087608/kWh (May) to $0.195198/kWh (Jan) by month — higher than the 2025 procurement.
varies by monthOverall trend: Medium-class standard offer supply fell from a 2023 peak (annual average ~16.5 cents/kWh) toward lower 2025-2026 levels; delivery rates have risen modestly (residential Rate A +4% for 2026).
Next expected change: Standard offer supply resets each January via MPUC bid; CMP delivery rates subject to pending/periodic rate case adjustments.
Cost Optimization Strategies
Because CMP supply is competitive and delivery is demand-segmented, C&I customers have two distinct levers: shop the supply portion and manage delivery demand. Standard Offer is a fair benchmark to beat with a competitive provider, and demand-class thresholds (20 kW, 400 kW) materially change the delivery structure.
Shop competitive supply
For: All C&I classes
Compare a Competitive Electricity Provider against the MPUC Standard Offer; the supply portion is roughly half the bill and is fully shoppable.
Demand management
For: MGS and LGS customers
Limit peak kW to stay below class thresholds (20 kW SGS, 400 kW LGS) and reduce demand charges in MGS/LGS delivery.
Use Interval Usage Web data
For: C&I with Interval Usage Web access
Pull hourly kWh and peak kW for C&I accounts to model supply offers and verify demand charges.
Net Energy Billing for on-site solar
For: Customers with on-site generation
Offset usage with qualifying generation credits under Maine NEB.
To implement these strategies, you need your 15-minute interval data. Learn how to download Central Maine Power (CMP) interval data →
Deregulated Market Shopping
CMP customers buy delivery from CMP (regulated) but choose their electricity supply: the default MPUC Standard Offer or a licensed Competitive Electricity Provider. For C&I, Medium-class standard offer is a fixed monthly schedule while Large-class is indexed monthly to wholesale prices, making competitive offers worth comparing.
How to Compare Central Maine Power (CMP) Suppliers
- 01Find your demand class and current supply price (Standard Offer or current CEP)
- 02Review licensed Competitive Electricity Providers via MPUC
- 03Compare fixed vs. indexed pricing and contract terms
- 04Switch supplier; CMP continues delivery and consolidated billing
Contract Terms for Central Maine Power (CMP) Supply Agreements
- Standard Offer is set annually (Medium fixed monthly; Large indexed monthly)
- Competitive contracts vary in term length and fixed/variable structure
- Supply switch does not change CMP delivery service
Common Pitfalls When Shopping Central Maine Power (CMP) Rates
- Variable/indexed rates can spike in winter (e.g., Jan-2026 Medium SO $0.195/kWh)
- Early-termination fees on competitive contracts
- Confirm whether a quoted rate is supply-only vs. all-in
Frequently Asked Questions
How can a C&I customer get hourly interval data from CMP?▾
Large commercial and industrial accounts can request Interval Usage Web access from Business Services (1-800-565-3181), which provides hourly kWh and peak kW with CSV export. Any AMI customer can also use Green Button Download My Data for up to 13 months of hourly CSV/XML.
Can a competitive supplier or aggregator pull our usage automatically?▾
Maine-licensed suppliers can use the Electricity Supplier Marketplace (customer opt-in) for hourly data, or EDI 867 with a CMP trading-partner agreement. Consultants/aggregators use authorized data requests or a Broker/Aggregator Authorization Agreement. There is no OAuth Connect My Data or REST API.
Does CMP set our electricity supply price?▾
No. CMP is a delivery-only utility. Supply comes from the MPUC-set Standard Offer (by customer class) or a Competitive Electricity Provider you choose. CMP bills delivery and, for Standard Offer customers, the supply charge on the suppliers' behalf.
Which rate class applies to our facility?▾
CMP segments non-residential delivery by demand: Small General Service (<20 kW, no demand charge), Medium General Service (20-400 kW), and Large/Primary General Service (>400 kW). Larger classes carry demand charges and are eligible for Interval Usage Web.
Are there fees for historical usage data?▾
The first 13 billing periods are free. Extended history carries fees governed by tariff Section 18.13; suppliers also reference Section 43 (fees for services to electricity providers).
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