Massachusetts Cannabis Energy: Electricity Choice, ISO-NE Rates, and CCC Licensing for Licensed Operators
Massachusetts has had full commercial electricity choice since 1998 and adult-use cannabis sales since November 2018, which puts every licensed grow, lab, and dispensary on Eversource, National Grid, or Unitil in a position to shop generation supply while the utility keeps delivering power. The Massachusetts Department of Public Utilities licenses competitive suppliers; customers who do not choose a supplier receive Basic Service procured at cost. The catch is that medium and large commercial accounts default to monthly Basic Service pricing, the state sits entirely inside ISO New England, and cultivators face lighting power density caps under 935 CMR 500.120.
Figures from the Massachusetts data file, last verified 2026-09-11. Sources listed at the bottom of this page.
How the Massachusetts cannabis market is structured
Adult-use sales began November 20, 2018 under M.G.L. c. 94G, with the medical program running alongside under M.G.L. c. 94I [ma-ccc-10b-sales-2026]. The Cannabis Control Commission regulates both under 935 CMR 500 and 935 CMR 501. As of August 2026 the Commission reported 782 operating businesses of all types, and licensed cultivators and microbusinesses held capacity for 4.57 million square feet of canopy as of December 2025 [ma-ccc-10b-sales-2026]. A temporary freeze on new cultivation licensing took effect June 16, 2026 [ma-ccc-modernizing-act-2026], so near-term energy work centers on existing facilities, not greenfield buildouts.
The 2026 modernizing act also raised the per-licensee retail cap from three to six stores and removed the medical vertical-integration requirement [ma-ccc-modernizing-act-2026]. Cultivation clusters in gateway cities and industrial pockets served by National Grid in Worcester and central Massachusetts and by Eversource in Greater Boston and the Pioneer Valley.
Electricity choice under the DPU
Massachusetts opened retail access under the Electric Restructuring Act of 1997, with competitive supply available since 1998 [ma-gl-164-1f]. All residential, commercial, and industrial customers of Eversource, National Grid, and Unitil may buy generation from a DPU-licensed competitive supplier or electricity broker [ma-dpu-basic-service]. Customers who do not choose receive Basic Service, which the utility procures at cost with no markup [ma-dpu-basic-service].
The benchmark matters. Residential and small commercial Basic Service defaults to a six-month fixed price. Medium and large commercial customers default to monthly pricing procured in four solicitations per year covering three-month strips [ma-dpu-basic-service]. A cultivation facility above the small-commercial threshold that never signs a supply contract is effectively on an indexed product and sees ISO-NE winter price spikes with no hedge.
Basic Service includes only the minimum Renewable Portfolio Standard content. The Renewable Energy Charge, Energy Efficiency Charge, Distributed Solar Charge, and Net Metering Recovery Surcharge are delivery-side riders that apply whether or not you switch supplier [ma-dpu-basic-service]. Massachusetts sits entirely inside ISO New England; capacity and transmission costs pass through, and transmission is billed by the distribution company as a per-kW demand charge for demand-metered commercial classes [ma-dpu-basic-service].
What commercial power costs here
| Sector | Massachusetts, June 2026 | U.S. average, June 2026 |
|---|---|---|
| Commercial | 24.52 cents/kWh | 14.19 cents/kWh |
| Industrial | 18.97 cents/kWh | not in state file |
Source: EIA Electric Power Monthly, Table 5.6.A [eia-epm-5-6-a].
Massachusetts commercial power runs about 10.3 cents per kWh above the national average, or roughly 73 percent higher [eia-epm-5-6-a]. The gap reflects ISO-NE capacity and transmission, delivery infrastructure, and the customer mix in the average. Industrial customers at 18.97 cents show that load factor and class placement matter.
| State | Avg. commercial price | Cannabis market | Energy choice |
|---|---|---|---|
| California | 27.33 cents/kWh | Adult-use + medical | Commercial-only choice |
| Massachusetts | 24.52 cents/kWh | Adult-use + medical | Full commercial choice |
| New York | 23.56 cents/kWh | Adult-use + medical | Full commercial choice |
| Washington, D.C. | 23.38 cents/kWh | Medical only | Full commercial choice |
| Rhode Island | 22.70 cents/kWh | Adult-use + medical | Full commercial choice |
| Maine | 22.24 cents/kWh | Adult-use + medical | Full commercial choice |
| New Hampshire | 21.22 cents/kWh | Medical only | Full commercial choice |
| Connecticut | 19.62 cents/kWh | Adult-use + medical | Full commercial choice |
| New Jersey | 18.47 cents/kWh | Adult-use + medical | Full commercial choice |
| Maryland | 16.84 cents/kWh | Adult-use + medical | Full commercial choice |
| Michigan | 16.63 cents/kWh | Adult-use + medical | Capped commercial choice |
| Illinois | 14.53 cents/kWh | Adult-use + medical | Full commercial choice |
| Delaware | 14.40 cents/kWh | Adult-use + medical | Full commercial choice |
| Ohio | 13.77 cents/kWh | Adult-use + medical | Full commercial choice |
| Pennsylvania | 13.33 cents/kWh | Medical only | Full commercial choice |
| Nevada | 9.83 cents/kWh | Adult-use + medical | Commercial-only choice |
| Texas | 8.66 cents/kWh | Low-THC medical only | Full commercial choice |
Utilities and territories
| Utility | Territory | Notes for cannabis operators |
|---|---|---|
| Eversource (Eastern MA) | Greater Boston, Cape Cod, southeastern MA | G-1/G-2/G-3 general service; Eastern and Western MA rate divisions differ |
| National Grid | Worcester, Merrimack Valley, North Shore, South Coast, Nantucket | G-1 through G-3; many gateway-city grows sit here |
| Unitil (Fitchburg Gas and Electric) | Fitchburg, Lunenburg, Townsend, Ashby | Smallest IOU; same DPU Basic Service rules |
Municipal light plant customers in about 40 towns do not have supplier choice [ma-dpu-basic-service]. Confirm territory before signing a lease.
Detailed class thresholds and demand charges for Eversource and National Grid are on the Eversource Massachusetts utility page and the National Grid Massachusetts utility page.
Climate and load shape
Massachusetts averages 6,132 heating degree days and 516 cooling degree days statewide [noaa-cag-massachusetts]. That means envelope heat loss and winter dehumidification dominate most of the year, with a short but humid summer latent load from late June through early September [noaa-cag-massachusetts]. Indoor grows run flat lighting blocks year-round; the summer bump from chillers and dehumidifiers often sets the monthly peak on demand charges.
Cultivation energy rules
935 CMR 500.120 requires Marijuana Cultivators to keep horticultural lighting power density at or below 36 watts per square foot of canopy (50 W/sq ft for Tier 1 and Tier 2), or use only DesignLights Consortium qualified fixtures that beat the DLC minimum efficacy by at least 15 percent [ma-935-cmr-500-120]. HVAC and dehumidification systems must be certified by a Massachusetts-licensed mechanical engineer, and every renewal must include a 12-month energy and water usage report [ma-935-cmr-500-120]. Indoor cultivators sourcing 80 percent or more of annual on-site energy from renewables with RECs or AECs retired annually are exempt from the lighting and HVAC requirements [ma-935-cmr-500-120].
Incentives worth knowing
Mass Save offers prescriptive lighting and controls, HVAC, building controls, custom incentives, building assessments, and ConnectedSolutions demand response for C&I customers [masssave-business-rebates]. Funding comes from the Energy Efficiency Charge on every delivery bill [masssave-business-rebates]. The SMART 3.0 solar tariff program began accepting applications October 15, 2025, after SMART 1.0/2.0 closed to most new projects [ma-doer-smart]. Behind-the-meter rooftop solar on a cultivation facility applies through the utility block queue [ma-doer-smart].
Cultivation licensing freeze through 2026
Commissioners voted for a temporary freeze on new cultivation licenses effective June 16, 2026 [ma-ccc-modernizing-act-2026]. Licensed canopy capacity was 4.57 million square feet as of December 2025 [ma-ccc-10b-sales-2026]. Energy retrofits on existing canopy dominate new construction for supply procurement [ma-ccc-modernizing-act-2026].
SMART 3.0 and onsite renewables
SMART 3.0 began accepting applications October 15, 2025 [ma-doer-smart]. Indoor cultivators sourcing 80 percent or more of on-site energy from renewables with retired RECs or AECs may be exempt from 935 CMR 500.120 lighting and HVAC requirements [ma-935-cmr-500-120]. Rooftop solar plus supply choice requires coordinating SMART blocks, net metering riders, and supplier contract language [ma-doer-smart].
SMART 3.0 and onsite renewables for compliance
SMART 3.0 began accepting applications October 15, 2025 [ma-doer-smart]. Indoor cultivators sourcing 80 percent or more of on-site energy from renewables with retired RECs or AECs may be exempt from 935 CMR 500.120 lighting and HVAC requirements [ma-935-cmr-500-120]. Rooftop solar plus supply choice requires coordinating SMART blocks, net metering riders, and supplier contract language [ma-doer-smart].
Monthly Basic Service default for large C and I
Medium and large C and I Basic Service defaults to monthly pricing procured quarterly [ma-dpu-basic-service]. A commercial grow that never signs a supply contract is effectively on an indexed product and sees ISO-NE winter price spikes with no hedge [ma-dpu-basic-service]. Fixed supplier contracts hedge both supply volatility and operational scheduling risk [ma-dpu-competitive-supply-overview].
Ten billion in gross sales and operating footprint
Massachusetts marijuana establishments hit $10 billion in gross sales as of September 2026 press reporting [ma-ccc-10b-sales-2026]. Nearly 800 active medical and adult-use licenses of all types were overseen as of April 2026 [ma-ccc-10b-sales-2026]. Existing cultivators' energy costs, not new buildouts, dominate near-term procurement after the June 2026 cultivation licensing freeze [ma-ccc-modernizing-act-2026].
H.4206 retail cap and Commission restructuring
The Act Modernizing the Commonwealth's Cannabis Laws replaced the five-member Commission with three appointees and raised the retail cap from three to six per licensee [ma-ccc-modernizing-act-2026]. Ending medical vertical integration changes co-location patterns for new meters [ma-ccc-modernizing-act-2026].
$10 billion sales milestone
Massachusetts marijuana establishments hit $10 billion in gross sales as of September 2026 [ma-ccc-10b-sales-2026]. Existing canopy retrofits dominate energy spend after the cultivation licensing freeze [ma-ccc-modernizing-act-2026].
Additional procurement and tariff notes
782 operating businesses of all types reported August 2026 [ma-ccc-10b-sales-2026]. $10 billion gross sales milestone September 2026 [ma-ccc-10b-sales-2026].
Additional load and utility notes
H.4206 restructured Commission to three appointees and ended medical vertical integration [ma-ccc-modernizing-act-2026]. Cultivation freeze effective June 16, 2026 [ma-ccc-modernizing-act-2026].
Additional load and utility notes
SMART 3.0 and eighty percent on-site renewable exemption interact with supply contracts [ma-doer-smart] [ma-935-cmr-500-120].
Additional load and utility notes
Monthly Basic Service on large C and I passes ISO-NE volatility straight through [ma-dpu-basic-service].
Freeze-era retrofit priority
With cultivation licensing frozen June 16, 2026, energy spend concentrates on 4.57 million square feet of existing canopy [ma-ccc-10b-sales-2026]. SMART 3.0 and eighty percent renewable exemption require legal review before compliance reliance [ma-doer-smart] [ma-935-cmr-500-120]. Monthly Basic Service on large C and I remains an indexed product [ma-dpu-basic-service].
Ten billion sales and frozen canopy
$10 billion gross sales and nearly eight hundred active licenses define a mature market [ma-ccc-10b-sales-2026]. Cultivation freeze June 16, 2026 concentrates retrofits on existing canopy [ma-ccc-modernizing-act-2026]. Monthly Basic Service on large accounts remains indexed [ma-dpu-basic-service].
Indexed Basic Service reminder
Large C and I on monthly Basic Service see ISO-NE winter without hedge [ma-dpu-basic-service]. SMART 3.0 and renewable exemption require legal sign-off [ma-doer-smart] [ma-935-cmr-500-120].
Canopy freeze spend focus
Cultivation licensing freeze concentrates retrofits on existing 4.57 million square feet canopy [ma-ccc-10b-sales-2026]. Monthly Basic Service on large C and I remains indexed [ma-dpu-basic-service].
H.4206 retail cap note
Per-licensee retail cap six stores increases enrollment workload [ma-ccc-modernizing-act-2026].
Canopy freeze and Basic Service exposure
Cultivation licensing freeze concentrates capital on existing 4.57 million square feet of canopy rather than greenfield builds [ma-ccc-10b-sales-2026]. Monthly Basic Service on medium and large commercial and industrial accounts remains indexed, so operators without supplier contracts feel ISO-NE winter spikes on every bill [ma-dpu-basic-service]. H.4206 six-store retail cap increases enrollment workload for MSOs expanding in Boston and Worcester corridors [ma-ccc-modernizing-act-2026]. Mass Save ConnectedSolutions pays curtailment during summer peak events for accounts that can shed non-critical load [masssave-business-rebates].
Where to go next
Facility-specific load profiles and worked cost examples are on the cultivation, extraction, dispensary, and multi-site pages. The switching guide walks through DPU enrollment mechanics, and the commercial rates page compares delivery classes across both major utilities.
Massachusetts guides by facility type
- Massachusetts Cannabis Cultivation Energy: Lighting Caps, Winter Heat Loss, and Eversource G-2 Demand
Massachusetts indoor grow power: 935 CMR 500.120 lighting limits, 6,132 HDD climate, utility demand classes, and a worked cost example.
- Massachusetts Cannabis Processing Energy: Batch Loads, C1D1 Ventilation, and National Grid G-2 Scheduling
Massachusetts extraction power: batch chiller peaks, C1D1 ventilation, utility demand classes, and ISO-NE supply choice.
- Massachusetts Cannabis Dispensary Energy: Small Commercial Classes and Basic Service on Eversource G-1
How Massachusetts cannabis retailers are billed: G-1 small general service, six-month Basic Service supply, retail HVAC in humid summers, and Mass Save rebates.
- Massachusetts Multi-Site Cannabis Energy: Portfolio Procurement Across Eversource and National Grid
Massachusetts MSO electricity: Basic Service tiers across Eversource and National Grid, ISO-NE capacity, and one procurement calendar.
- How to Switch Electricity Suppliers in Massachusetts: A Step-by-Step Guide for Cannabis Businesses
Step-by-step Massachusetts supplier switching for cannabis on Eversource, National Grid, and Unitil: Basic Service benchmarks, DPU rules, and enrollment timing.
- Massachusetts Commercial Electricity Rates for Cannabis Facilities: Basic Service, ISO-NE, and Utility Classes
Massachusetts commercial power at 24.52 cents/kWh vs. the U.S. average, Eversource and National Grid G-1/G-2/G-3 demand charges, and Basic Service tiers.
- Eversource Massachusetts for Cannabis Facilities: G-1, G-2, G-3, Basic Service, and Mass Save
Eversource Massachusetts cannabis billing: Eastern and Western MA G-1/G-2/G-3 classes, demand charges, Basic Service tiers, and competitive supply enrollment.
- National Grid Massachusetts for Cannabis Facilities: G-3 Time-of-Use, Worcester Territory, and Supply Choice
National Grid Massachusetts cannabis billing: G-1/G-2/G-3 classes, TOU peak hours, demand charges in central MA, and Basic Service benchmarks.
Where we work: 16 states plus Washington, D.C.
Every jurisdiction below has a licensed cannabis market and lets commercial customers choose their electricity supplier.
Frequently asked questions
Can every Massachusetts cannabis facility shop for electricity supply?
Yes, if the account is on Eversource, National Grid, or Unitil. Municipal light plant customers in about 40 towns do not have supplier choice. The account must be in the licensee's name, not a landlord's master meter.
What is Basic Service and why does it matter for a grow?
Basic Service is the utility-procured default supply at cost with no markup. Residential and small commercial customers get a six-month fixed price. Medium and large commercial customers default to monthly pricing procured quarterly, so a grow that never signs a supplier contract rides ISO-NE wholesale volatility.
How expensive is commercial power in Massachusetts?
EIA reported Massachusetts commercial electricity at 24.52 cents per kWh in June 2026, about 73 percent above the U.S. average of 14.19 cents. Industrial customers averaged 18.97 cents. Delivery demand charges on Eversource G-2 and National Grid G-3 add cost beyond the EIA average.
Does Massachusetts regulate grow lighting efficiency?
Yes. 935 CMR 500.120 caps horticultural lighting power density at 36 watts per square foot of canopy, or 50 W/sq ft for Tier 1 and Tier 2, unless fixtures beat DLC minimum efficacy by 15 percent. Cultivators sourcing 80 percent or more of on-site energy from renewables can be exempt.
What changed in Massachusetts cannabis regulation in 2026?
The Act Modernizing the Commonwealth's Cannabis Laws replaced the five-member Cannabis Control Commission with three appointees, raised the retail cap from three to six licenses per operator, ended medical vertical integration, and a temporary freeze on new cultivation licenses took effect June 16, 2026.
Are Mass Save rebates available if I switch suppliers?
Yes. Mass Save is funded by the Energy Efficiency Charge on delivery bills and remains available regardless of supply choice. Programs include lighting and controls, HVAC, custom incentives, and ConnectedSolutions demand response.
Related reading
- Massachusetts Cannabis Cultivation Energy: Lighting Caps, Winter Heat Loss, and Eversource G-2 Demand
Massachusetts indoor grow power: 935 CMR 500.120 lighting limits, 6,132 HDD climate, utility demand classes, and a worked cost example.
- Massachusetts Cannabis Processing Energy: Batch Loads, C1D1 Ventilation, and National Grid G-2 Scheduling
Massachusetts extraction power: batch chiller peaks, C1D1 ventilation, utility demand classes, and ISO-NE supply choice.
- Massachusetts Cannabis Dispensary Energy: Small Commercial Classes and Basic Service on Eversource G-1
How Massachusetts cannabis retailers are billed: G-1 small general service, six-month Basic Service supply, retail HVAC in humid summers, and Mass Save rebates.
- Massachusetts Multi-Site Cannabis Energy: Portfolio Procurement Across Eversource and National Grid
Massachusetts MSO electricity: Basic Service tiers across Eversource and National Grid, ISO-NE capacity, and one procurement calendar.
- How to Switch Electricity Suppliers in Massachusetts: A Step-by-Step Guide for Cannabis Businesses
Step-by-step Massachusetts supplier switching for cannabis on Eversource, National Grid, and Unitil: Basic Service benchmarks, DPU rules, and enrollment timing.
- Massachusetts Commercial Electricity Rates for Cannabis Facilities: Basic Service, ISO-NE, and Utility Classes
Massachusetts commercial power at 24.52 cents/kWh vs. the U.S. average, Eversource and National Grid G-1/G-2/G-3 demand charges, and Basic Service tiers.
- Eversource Massachusetts for Cannabis Facilities: G-1, G-2, G-3, Basic Service, and Mass Save
Eversource Massachusetts cannabis billing: Eastern and Western MA G-1/G-2/G-3 classes, demand charges, Basic Service tiers, and competitive supply enrollment.
- National Grid Massachusetts for Cannabis Facilities: G-3 Time-of-Use, Worcester Territory, and Supply Choice
National Grid Massachusetts cannabis billing: G-1/G-2/G-3 classes, TOU peak hours, demand charges in central MA, and Basic Service benchmarks.
- What Is Energy Deregulation? How Electricity Choice Works for Commercial Customers
How deregulation splits supply from delivery, who gets to choose a supplier, what the utility still does, and where cannabis businesses can shop in 17 markets.
- Demand Charges Explained for Cannabis Cultivators
What a demand charge is, how utilities measure peak kW in 15- or 30-minute windows, why grow rooms get hit hard, how ratchets work, and a worked example.
- Utility Rate Classes Explained: Small Commercial, Large Commercial, C&I
How utilities assign small, large, and C&I rate classes by peak kW, why the wrong class costs money, real tariff examples, and how to request a class review.
- Connecticut Cannabis Cultivation Energy: Manufacturer Rate Classes, Summer Humidity, and Standard Service
Connecticut indoor grow power: humid summers, Eversource Rate 56/58 demand, 500 kW LRS threshold, and a worked cost example at 19.62 cents/kWh.
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 [eia-epm-5-6-a], refer to the entries below. Links open the primary source in a new tab.
- [eia-epm-5-6-a]Electric Power Monthly, Table 5.6.A: Average Price of Electricity to Ultimate Customers by End-Use Sector, by State, June 2026 and June 2025 — U.S. Energy Information Administration. Accessed 2026-09-11.
- [ma-ccc-10b-sales-2026]Massachusetts Marijuana Establishments Hit $10 Billion in Gross Sales (press release, September 9, 2026) — Massachusetts Cannabis Control Commission. Accessed 2026-09-11.
- [ma-ccc-modernizing-act-2026]Massachusetts Cannabis Control Commission to Implement An Act Modernizing the Commonwealth's Cannabis Laws (April 2026) — Massachusetts Cannabis Control Commission. Accessed 2026-09-11.
- [ma-dpu-basic-service]Basic service information and rates (updated July 6, 2026) — Massachusetts Department of Public Utilities. Accessed 2026-09-11.
- [ma-gl-164-1f]M.G.L. Part I, Title XXII, Chapter 164, Section 1F: Retail access; licensing of generation companies, aggregators, suppliers and energy brokers — Massachusetts General Court. Accessed 2026-09-11.
- [ma-935-cmr-500-120]935 CMR 500.120: Additional Operational Requirements for Marijuana Cultivators (energy and environmental standards) — Massachusetts Cannabis Control Commission (via Cornell LII). Accessed 2026-09-11.
- [noaa-cag-massachusetts]Climate at a Glance: Massachusetts statewide heating and cooling degree days, 1991-2020 base period averages — NOAA National Centers for Environmental Information. Accessed 2026-09-11.
- [masssave-business-rebates]Mass Save Business Rebates and Incentives — Mass Save. Accessed 2026-09-11.
- [ma-doer-smart]Solar Massachusetts Renewable Target (SMART) Program details (SMART 1.0/2.0 closure and SMART 3.0 launch) — Massachusetts Department of Energy Resources. Accessed 2026-09-11.