Maine Cannabis Energy: Electricity Choice, Rates, and CMP vs. Versant for Licensed Operators

How the Maine cannabis market is structured

Adult-use retail sales began October 9, 2020 under the Marijuana Legalization Act (28-B MRSA), regulated by the Office of Cannabis Policy within the Department of Administrative and Financial Services [ocp-adult-use-licensee-search]. The Maine Medical Use of Cannabis Program (22 MRSA chapter 558-C), dating to 2010 and consolidated under OCP in February 2019, runs in parallel with registered dispensaries and a large caregiver sector [ocp-medical-use].

As of OCP licensing data updated September 9, 2026, Maine counted 76 active adult-use cultivation facilities, 80 products manufacturing facilities, 187 retail stores, and 3 testing facilities [ocp-adult-use-licensee-search]. Cultivation tiers range from Tier 1 canopy and plant-count licenses through Tier 4 canopy operations [ocp-adult-use-licensee-search].

Two features matter for energy buying:

• Medical load sits outside adult-use rules. Medical product is not yet subject to mandatory contaminant testing or statewide inventory tracking [ocp-medical-use]. A significant share of cultivation load runs in facilities regulated far more lightly than adult-use licensees.
• Retail density is rising. Adult-use store counts grew from 163 to 187 over the prior year, which means more small-commercial accounts entering the market alongside production facilities [ocp-adult-use-licensee-search].

How electricity choice works in Maine

Maine restructured under the Electric Industry Restructuring Act (35-A MRSA chapter 32), with retail access from March 1, 2000 [me-35a-3202]. Transmission and distribution utilities deliver power but do not sell generation; customers who do not choose a Competitive Electricity Provider receive Standard Offer Service selected by the PUC through annual competitive bids [me-35a-3212] [mpuc-electricity].

Every customer class on CMP and Versant may shop: residential, medium non-residential, and large non-residential [mpuc-standard-offer-rates]. Consumer-owned utilities are outside the CEP framework [mpuc-electricity].

Standard offer splits into three classes with different price behavior [mpuc-standard-offer-rates]:

Class	Price type	2026 CMP example
Medium non-residential	Fixed by month from annual bid	8.76 cents/kWh (May) to 19.52 cents/kWh (January) [mpuc-standard-offer-rates]
Large non-residential	Indexed to wholesale, reset monthly	7.23 cents/kWh (May) to 18.23 cents/kWh (January) plus capacity charge about $3.34 to $3.42/kW [mpuc-cmp-large]

A large grow on standard offer without a CEP contract is effectively on a floating wholesale price that spikes in winter [mpuc-cmp-large]. Fixed-price supply contracts are the main hedge.

CMP and Versant Bangor Hydro District sit in ISO New England [mpuc-standard-offer-rates]. Versant's Maine Public District in Aroostook County is administered by NMISA with a separate supplier pool and higher standard offer prices [mpuc-mpd-large].

What commercial power costs in Maine vs. the U.S.

Sector	Maine, June 2026	U.S. average, June 2026
Commercial	22.24 cents/kWh	14.19 cents/kWh
Industrial	14.21 cents/kWh	not in state file

Source: EIA Electric Power Monthly, Table 5.6.A [eia-epm-5-6-a].

Maine commercial power runs about 57 percent above the national average. The gap between commercial and industrial averages reflects delivery structure and load factor. A facility with flat lighting load prices closer to the industrial line; a facility with spiky winter peaks pays the commercial-class delivery premium.

The utilities and where they serve

Utility	Territory	Grid	Notes for cannabis operators
Central Maine Power (CMP)	Southern, central, and western Maine including Portland, Lewiston-Auburn, Augusta	ISO New England	Largest T&D utility; MGS above 20 kW, IGS above 400 kW, LGS above 1,000 kW [cmp-mgs-tariff]
Versant Power (Bangor Hydro District)	Eastern Maine including Bangor and Ellsworth	ISO New England	Separate tariffs from Maine Public District
Versant Power (Maine Public District)	Aroostook County, Presque Isle, Houlton	NMISA	Higher standard offer; Rate E-P bills $21.14/kW combined distribution and transmission demand [versant-mpd-tariffs]

Sources: utility tariff pages and MPUC materials [cmp-mgs-tariff] [mpuc-standard-offer-rates].

The Maine commercial rate page puts delivery classes and standard offer tiers side by side. Facility guides cover load shape by license type: cultivation, extraction and processing, dispensary retail, and multi-site operators.

What the climate does to a grow's bill here

Maine runs cold and humid continental, with statewide normals of 7,758 heating degree days and 238 cooling degree days [noaa-cag-maine]. A Maine grow is heating-dominated for eight months and can use economizer or outside-air cooling for much of the year, but must manage very dry winter air and short, humid summers [noaa-cag-maine]. Summer humidity is moderate along the coast; the bigger year-round issue is sub-freezing winter air that drives humidification and lighting-heat recovery decisions in sealed rooms [noaa-cag-maine].

Incentives worth knowing

• Efficiency Maine Commercial and Industrial Prescriptive Program. Prescriptive incentives for lighting, HVAC, refrigeration, compressed air, and agricultural measures through Qualified Partners [efficiency-maine-at-work].
• Efficiency Maine Commercial and Industrial Custom Program. Custom incentives for site-specific projects with awards of roughly $10,000 to $1 million per year covering up to 50% of project cost, plus free scoping audits [efficiency-maine-at-work]. The natural path for cultivation HVAC, dehumidification, or horticultural lighting retrofits.

Program measure lists and budgets change. Confirm current eligibility with Efficiency Maine before ordering equipment.

Maine quirks that change the advice

Large-class standard offer floats monthly. Because the large non-residential standard offer is indexed to wholesale prices and reset each month, a large facility that never signs a CEP contract is exposed to winter price spikes [mpuc-cmp-large]. CMP large-class energy was 18.2 cents/kWh in January 2026 versus 7.2 cents in May [mpuc-cmp-large].

Northern Maine is its own grid. Versant's Maine Public District is administered by NMISA rather than ISO New England, has higher standard offer prices, and a different supplier pool [mpuc-mpd-large]. A facility in Aroostook County should not assume New England market pricing or supplier availability.

Medical program without mandatory testing or tracking. Maine's medical program still has no mandatory contaminant testing or statewide inventory tracking [ocp-medical-use], so a large share of cultivation load sits in facilities regulated far more lightly than adult-use licensees.

Adult-use versus medical load split

OCP reports 346 active adult-use establishments including 76 cultivation sites and 187 retail stores [marijuana-herald-maine-counts-2026]. Medical caregivers and dispensaries operate under lighter testing and tracking rules [ocp-medical-use]. Energy planning for statewide market share must separate regulated adult-use meters from medical caregiver load [ocp-medical-use].

Constellation and New Brunswick supply mix

2026 CMP medium standard offer suppliers are 20 percent Constellation and 80 percent New Brunswick Energy Marketing [mpuc-standard-offer-rates]. The PUC aims to keep at least three standard offer providers per territory under 35-A MRSA 3212 [me-35a-3212]. CEP contracts may source differently; compare renewable content disclosures [mpuc-electricity].

Heating-dominated climate summary

Maine averages 7,758 heating degree days and 238 cooling degree days [noaa-cag-maine]. Envelope and humidification decisions matter more than chiller tonnage for most of the year [noaa-cag-maine]. Versant MPD Rate E-P minimum billing demand of 50 kW affects small industrial sites in Aroostook [versant-mpd-tariffs].

Docket 2025-00157 standard offer awards

2026 standard offer awards were set in MPUC Docket No. 2025-00157 [mpuc-standard-offer-rates]. Medium class uses fixed monthly prices; large class uses monthly index plus capacity [mpuc-cmp-large]. Re-bid CEP contracts in Q4 before January indexed spikes repeat [mpuc-cmp-large].

Medical caregiver energy outside OCP testing

Medical caregivers operate without mandatory testing or statewide tracking [ocp-medical-use]. Adult-use licensees face stricter operational reporting [ocp-adult-use-licensee-search]. Corporate structures spanning both programs need separate meter governance [ocp-medical-use].

Additional procurement and tariff notes

Large-class standard offer indexed from 7.23 cents/kWh May to 18.23 cents/kWh January 2026 [mpuc-cmp-large]. Fixed CEP contracts hedge that spread [me-35a-3212].

Parallel medical and adult-use governance

Tag meters by regulatory program before corporate procurement [ocp-medical-use] [ocp-adult-use-licensee-search]. Adult-use licensees face stricter operational structure than caregivers [ocp-medical-use]. Re-bid CEP contracts before winter indexed standard offer repeats [mpuc-cmp-large].

OCP license totals and meter growth

Seventy-six cultivation, eighty manufacturing, and one hundred eighty-seven retail adult-use licenses imply hundreds of commercial meters statewide [marijuana-herald-maine-counts-2026]. Medical caregiver load sits outside OCP testing rules [ocp-medical-use]. Corporate structures spanning both need separate procurement tracks [ocp-medical-use].

Supplemental tariff and procurement detail

Constellation and New Brunswick supply twenty/eighty split on 2026 CMP medium standard offer [mpuc-standard-offer-rates]. CEP contracts may source differently; read renewable content disclosures [mpuc-electricity]. Northern Maine NMISA pricing requires separate supplier pool [mpuc-mpd-large].

Adult-use versus medical meter tags

Tag adult-use and medical caregiver meters separately in corporate procurement [ocp-medical-use] [ocp-adult-use-licensee-search]. Re-bid CEP before winter indexed standard offer [mpuc-cmp-large].

Medical caregiver load tag

Corporate procurement should tag medical caregiver meters separately from adult-use OCP licensees [ocp-medical-use]. Northern Maine NMISA pricing requires separate supplier pool [mpuc-mpd-large].

OCP September 2026 license totals

Refresh OCP license totals from the September 2026 dataset before investor decks [marijuana-herald-maine-counts-2026].

OCP license growth and meter planning

The Office of Cannabis Policy reported 308 active licenses and 1,200 medical caregivers as of September 2026, with adult-use retail expanding faster than cultivation square footage [marijuana-herald-maine-counts-2026]. New retail meters in Portland and Lewiston clusters typically land on CMP small general service, while Down East cultivation on Versant Bangor Hydro uses MPD standard offer classes [cmp-mgs-tariff] [mpuc-mpd-large]. Corporate procurement should tag medical caregiver accounts separately from adult-use OCP licensees when building portfolio supply calendars [ocp-medical-use].

Where to go next on this site

• Facility guides: cultivation, extraction and processing, dispensary retail, multi-site operators.
• Procedure: how to switch electricity suppliers in Maine.
• Numbers: Maine commercial electricity rates.
• Background: what energy deregulation is and how demand charges work.

Maine law and tariffs change on MPUC dockets. Confirm current rules with the PUC or your advisor before signing a contract.