Maine Medium and Large C&I Standard Offer Monthly Pricing
Maine's medium and large commercial and industrial standard offer customers are placed on monthly pricing by default, with optional 3-month fixed windows. Larger cultivation sites that graduate past small C&I lose the annual fixed standard offer product and face monthly supply volatility unless they contract with a competitive supplier.
By Jason Taken, Founder, Jaken Energy
Updated September 12, 2026Two standard offer products in Maine
Maine splits standard offer procurement by customer size [me-mpuc-medium-so] [me-electricity-guide-2026]:
| Customer class | Default product | Procurement rhythm |
|---|---|---|
| Residential + small C&I | Fixed annual price Jan 1–Dec 31 | Two solicitations/year, 50% of 12-month need each [me-electricity-guide-2026] |
| Medium + large C&I | Monthly price | Four solicitations/year, 100% of each 3-month block [me-mpuc-medium-so] |
The January 1 fixed rates cited in our 2026 standard offer increases post (12.72¢ CMP, 12.95¢ Versant BHD, 14.87¢ MPD) apply to small commercial accounts [me-electricity-guide-2026] [me-pa-so-2026]. They do not automatically apply once your grow graduates to medium C&I.
Versant historical orders note medium business prices vary month to month, averaging 15.8 cents per kWh in one procurement cycle while small customers saw lower annual fixes [me-mpuc-medium-so].
Why this matters for expanding canopy
Indoor cannabis load jumps when:
- Veg and flower rooms energize on separate panels
- HVAC and dehumidification push demand above small commercial thresholds
- Extraction or post-harvest equipment adds continuous load
You can cross into medium C&I mid-license without noticing until monthly supply swings hit cash planning.
Monthly standard offer tracks ISO-NE wholesale moves [me-pa-so-2026]. A facility budgeting off 12.72¢ small C&I fixed supply will miss winter spikes on monthly pricing.
Monthly vs 3-month fixed option
Medium and large C&I may opt into a 3-month fixed standard offer window instead of monthly pricing [me-mpuc-medium-so]. That requires contacting CMP or Versant before the procurement period.
Tradeoffs:
| Option | Predictability | Effort |
|---|---|---|
| Default monthly SO | Low | None |
| 3-month SO fixed | Medium | Utility enrollment each window |
| Competitive retail fixed | High if contract solid | Shopping + contract review |
Read fixed vs index contracts before signing retail deals.
Worked example: monthly volatility
Inputs we chose for a medium C&I account at 140,000 kWh/month.
| Month | Illustrative SO ¢/kWh | Supply cost |
|---|---|---|
| January | 13.5¢ | $18,900 |
| February | 16.2¢ | $22,680 |
| March | 14.8¢ | $20,720 |
| Q1 total | $62,300 |
Same kWh at a 12.72¢ small fixed rate (not available to this class) would be $17,808/month or $53,424/Q1 [me-electricity-guide-2026]. The ~$8,876 spread illustrates class risk, not a guaranteed forward curve.
Replace illustrative months with MPUC posted medium rates for your utility zone [me-mpuc-medium-so].
Competitive supply as budget tool
Under Maine switching, retail suppliers may offer 12–36 month fixed supply while wires charges stay with CMP or Versant.
Checklist:
- Confirm rate class on your bill header
- Compare retail fixed to trailing 12 months of monthly SO, not January headlines alone
- Review ISO-NE capacity pass-through clauses
- Keep demand management on utility tariffs; see understanding your commercial utility bill
Large grows may also evaluate block-and-index structures if staff can manage hourly risk.
Coordination with January small C&I resets
Operators with multiple meters might keep veg on small C&I and flower on medium schedules. Each meter has its own class rules. Aggregation for supply shopping depends on supplier rules and utility consent.
Public Advocate Heather Sanborn emphasized affordability after the 2026 small C&I increase, citing $13–$17/month average residential impacts [me-pa-so-2026]. Medium C&I volatility can exceed that on a single high-kWh invoice.
Takeaway
Maine medium and large C&I standard offer defaults to monthly pricing from quarterly procurements [me-mpuc-medium-so]. Small C&I annual fixed rates like 12.72¢ CMP do not govern larger cultivation accounts [me-electricity-guide-2026].
When your facility outgrows small commercial limits, treat budget certainty as a procurement project: opt into 3-month SO fixed where available, or contract competitive fixed supply before monthly ISO-NE swings hit your P&L.
MPUC medium class historical volatility
MPUC orders document Versant medium business prices averaging 15.8¢ in a procurement cycle while small customers held lower annual fixes [me-mpuc-medium-so]. Your monthly SO line can exceed small C&I headlines by 3¢+ without any equipment failure.
Four procurements per year mechanics
Medium/large SO procures 100% of three-month blocks four times annually [me-electricity-guide-2026]. A Q3 spike hits September bills even if January SO looked tame.
When to opt into 3-month fixed SO
Utilities allow three-month fixed SO for medium/large accounts who request enrollment [me-mpuc-medium-so]. Deadlines precede each block; missing a window leaves you on monthly pricing another quarter.
Retail vs regulated fixed
Third-party 12-month fixed may beat three-month SO fixed if retail margin is tight. Compare early termination, bandwidth, and ISO-NE capacity pass-through in supplier contract worksheet exercises.
Cultivation scheduling and monthly SO
Harvest weeks raising dehumidification overlap high SO months amplify $ impact. Shift dry cycles where process allows; SO price is exogenous but kWh shape is not.
CMP vs Versant medium tables
MPUC maintains separate standard offer tables for CMP and Versant zones [me-mpuc-medium-so]. A multi-facility operator in Bangor and Portland may see different monthly SO curves even under the same state rules [me-electricity-guide-2026].
OPA disclaimer on renewable labels
Competitive product tables warn the OPA cannot verify voluntary renewable adders above state minimums [me-electricity-guide-2026]. 100% renewable retail claims for branding require contract review, not table footnotes alone.
Fixed annual SO is not your product
If your rate class says medium general service, the January 1 fixed 12.72¢ headline does not apply [me-electricity-guide-2026] [me-mpuc-medium-so]. Misreading class costs six-figure forecasting errors on 100,000 kWh/month sites.
Request 3-month fixed early
Medium accounts must contact the utility to enroll in 3-month fixed SO [me-mpuc-medium-so]. Missing procurement windows locks another quarter of monthly exposure [me-electricity-guide-2026].
Rate schedule thresholds that trigger medium class
Maine assigns medium and large C&I standard offer when demand or usage crosses utility schedule thresholds [me-mpuc-medium-so]. Indoor cannabis often jumps classes when:
- A second flower room energizes on the same meter
- Extraction equipment adds continuous baseload
- Post-harvest HVAC raises coincident peak above small commercial limits
Confirm class on the bill header with CMP or Versant account managers before using 12.72 cents CMP headlines from our 2026 standard offer increases post [me-electricity-guide-2026].
Quarterly procurement math for four blocks
Medium/large SO procures 100% of each three-month block through four solicitations per year [me-electricity-guide-2026] [me-mpuc-medium-so]. A Q3 spike in September bills can occur even when January SO looked tame because each block reprices independently [me-mpuc-medium-so].
Budget month-by-month SO using MPUC posted medium tables, not annual averages [me-mpuc-medium-so].
Retail fixed versus 3-month regulated fixed
Third-party 12-month fixed supply may beat three-month utility fixed SO if retail margin is tight and ISO-NE capacity pass-through is transparent [me-electricity-guide-2026]. Compare:
| Option | Predictability | Exit risk |
|---|---|---|
| Default monthly SO | Low | None |
| Utility 3-month fixed SO | Medium | Re-enroll each window [me-mpuc-medium-so] |
| Competitive retail 12–36 month fixed | High if contract solid | ETF if canopy plans change |
Use supplier contract comparison worksheet exercises alongside Maine cultivation facility energy load forecasts.
Harvest scheduling and monthly SO overlap
Harvest weeks raising dehumidification can overlap high SO months, amplifying dollar impact [me-mpuc-medium-so]. Shift dry cycles where process allows; SO price is exogenous but kWh shape is not [me-electricity-guide-2026].
OPA renewable label disclaimer
Competitive product tables warn the OPA cannot verify voluntary renewable adders above state minimums [me-electricity-guide-2026]. 100% renewable retail claims for branding require contract review, not table footnotes alone [me-electricity-guide-2026].
Multi-meter veg and flower split
Operators with veg on small C&I fixed SO and flower on medium monthly SO need two procurement strategies on one campus [me-mpuc-medium-so]. Supplier aggregation rules vary; confirm with CMP or Versant before assuming one retail contract covers both meters [me-electricity-guide-2026].
Public Advocate $13–$17 framing versus medium volatility
Sanborn's $13–$17/month average increase quote reflects small C&I/residential bands [me-pa-so-2026]. Medium monthly SO can swing 3 cents+ month to month versus 12.72 cents CMP small fixed headlines [me-mpuc-medium-so]. A single February invoice at 16.2 cents illustrative pricing exceeds annual small C&I comfort levels [me-mpuc-medium-so] [me-electricity-guide-2026].
ISO-NE wholesale drivers on quarterly blocks
Four procurements per year tie medium/large SO to ISO-NE wholesale moves [me-mpuc-medium-so] [me-pa-so-2026]. Natural gas and capacity spikes in winter Q1 blocks hit dehumidification kWh simultaneously [me-pa-so-2026]. Compare trailing twelve-month medium SO to retail fixed offers under Maine switching guidance [me-electricity-guide-2026].
Document checklist before signing retail fixed
- Twelve months of CMP or Versant bills with rate class header visible [me-mpuc-medium-so]
- MPUC medium SO table history for your zone [me-mpuc-medium-so]
- Written ISO-NE capacity pass-through table from supplier [me-electricity-guide-2026]
- Expansion schedule aligned to quarterly procurement windows [me-mpuc-medium-so]
- Confirmation account is medium/large C&I, not small fixed SO [me-electricity-guide-2026] [me-pa-so-2026]
When your facility outgrows small commercial limits, treat budget certainty as a procurement project: 3-month SO fixed where available, or competitive fixed supply before monthly ISO-NE swings hit your P&L [me-mpuc-medium-so] [me-electricity-guide-2026]. Cross-check January fixed SO headlines from our 2026 standard offer increases post against your actual rate class first [me-pa-so-2026].
Maine medium and large C&I standard offer defaults to monthly pricing from quarterly procurements [me-mpuc-medium-so]. Small C&I annual fixed rates like 12.72 cents CMP do not govern larger cultivation accounts without a class change verification [me-electricity-guide-2026] [me-mpuc-medium-so].
Frequently asked questions
What is the difference between small and medium C&I standard offer in Maine?
Small residential and commercial customers receive a fixed standard offer price set annually on January 1. Medium and large C&I customers default to monthly standard offer pricing that changes each month, with an optional 3-month fixed alternative.
Why don't medium C&I accounts get the January fixed rate?
Maine procurement rules solicit supply four times per year for medium and large classes, procuring 100 percent of required supply for each 3-month period. The monthly price reflects each procurement tranche.
When does a cannabis grow become medium C&I?
Thresholds depend on utility rate schedules and demand levels. High-kW cultivation sites often exceed small commercial limits when flower rooms energize. Confirm class with CMP or Versant account managers.
Can medium C&I customers choose competitive suppliers?
Yes. Maine allows competitive electricity supply for eligible accounts. Suppliers can offer multi-month fixed pricing regardless of default monthly standard offer.
How volatile is monthly standard offer?
Prices track ISO-NE wholesale markets. Winter months can diverge sharply from summer. Medium Versant accounts have seen average prices near 15.8 cents in past years when annual small C&I rates were lower.
Related reading
- How to Switch Electricity Suppliers in Maine: A Step-by-Step Guide for Cannabis Businesses
Step-by-step Maine CEP switching for cannabis accounts on CMP and Versant: standard offer tiers, enrollment, and contract rules under 35-A MRSA chapter 32.
- Maine Cannabis Cultivation Facility Energy: Winter Heat, CMP Demand Classes, and Standard Offer Exposure
Maine indoor grow power: 7,758 heating degree days, winter humidification, CMP MGS demand thresholds, worked example at 22.24 cents/kWh.
- Maine 2026 Standard Offer Rate Increases
Maine 2026 standard offer supply rose 20–28%: CMP 12.72¢, Versant BHD 12.95¢, MPD 14.87¢. Cultivators should shop before the next January 1 reset.
- Fixed vs. Index vs. Block-and-Index Electricity Contracts
What each supply structure means, who carries price risk, which fits a 24/7 grow load, what pass-throughs do, and a worked 12-month comparison.
- Understanding Your Commercial Utility Bill (Line-Item Breakdown)
Supply vs delivery, customer charge, distribution demand, transmission, capacity, riders, power factor, and taxes, with an annotated sample bill for a grow.
- Maine's January 1 Standard Offer Reset: Why Q4 Is the Shopping Window
Maine standard offer resets January 1. Shop competitive supply in Q4 before CMP, Versant, and MPD winter default rates lock in.
Jason Taken founded Jaken Energy, the commercial energy procurement practice behind this site. He works with licensed cannabis operators in deregulated electricity markets to lower supply rates, manage demand charges, and evaluate efficiency upgrades.
Sources
Inline citations in this article, such as [me-mpuc-medium-so], refer to the entries below. Links open the primary source in a new tab.
- [me-mpuc-medium-so]Standard Offer Rates for Versant Power - Bangor Hydro District (medium class notes) — Maine Public Utilities Commission. Accessed 2026-09-12.
- [me-electricity-guide-2026]Electricity Guide Spring 2026 — Maine Office of the Public Advocate. Accessed 2026-09-12.
- [me-pa-so-2026]Public Advocate responds to 2026 standard offer supply rate increases — Maine Office of the Public Advocate. Accessed 2026-09-12.