Massachusetts Cannabis Processing Energy: Batch Loads, C1D1 Ventilation, and National Grid G-2 Scheduling

How a processing lab differs from a grow on the meter

Extraction and product manufacturing facilities in Massachusetts draw load in batches, not flat blocks. A hydrocarbon or ethanol run pulls chillers, recovery compressors, and ventilation together. An infusion line runs ovens and mixers on shift schedules. The Cannabis Control Commission oversees product manufacturers under 935 CMR 500 alongside cultivators; the state reported 782 operating businesses of all types as of August 2026 [ma-ccc-10b-sales-2026].

The utility sees whichever half-hour interval stacks the most coincident equipment. That matters because Eversource G-2 bills $20.21/kW distribution demand plus $13.74/kW transmission demand on average demand above 100 kW [eversource-ema-rates-2026], and National Grid G-2 bills $15.06/kW distribution demand above 10,000 kWh per month [national-grid-ma-rates].

Major load components

Equipment	Load character	Peak risk
Process chillers	Cyclical during runs	High when multiple batches overlap
Solvent recovery	Follows chiller cycles	Adds to coincident peak
C1D1 ventilation	Continuous	Sets a demand floor
Ovens and distillation	Batch	Spikes at shift start if staggered poorly
Cold storage	Continuous	Baseline kWh
Lab HVAC	Seasonal	Higher in summer with 516 CDD statewide [noaa-cag-massachusetts]

Massachusetts humidity means air-cooled chillers lose efficiency in July and August when dew points run mid-60s to low-70s F [noaa-cag-massachusetts]. Budget higher kW per ton in summer than nameplate suggests.

Rate class placement

Small labs under 100 kW average demand on Eversource may stay on G-1, which offers a non-demand price option (all per-kWh) or a demand price option billing $22.31/kW distribution plus $19.34/kW transmission on demand above 10 kW [eversource-ema-rates-2026]. Labs that cross 100 kW average move to G-2 with the rates above [eversource-ema-rates-2026].

On National Grid, G-1 has no demand charge below 10,000 kWh per month or 200 kW [national-grid-ma-rates]. G-2 applies above that threshold with $15.06/kW distribution demand [national-grid-ma-rates]. G-3 Time-of-Use above 200 kW adds peak/off-peak energy pricing with weekday peak hours 8 a.m. to 9 p.m. [national-grid-ma-rates].

Processing labs with flat batch schedules may benefit from evaluating whether G-3 TOU off-peak scheduling reduces energy cost, though ventilation load often prevents large shifts.

Worked example: ethanol extraction lab

Assume a 8,000 sq ft lab in Lowell on National Grid with batch ethanol extraction, average demand of 85 kW, and 520,000 kWh per year (all inputs).

Line item	Calculation
Energy at MA commercial average	520,000 kWh x $0.2452/kWh = $127,504 [eia-epm-5-6-a]
G-2 demand (if peak hits 85 kW)	85 kW x $15.06/kW = $1,280/month, about $15,360/year [national-grid-ma-rates]

At 24.52 cents per kWh commercial average, energy alone exceeds $127,000 per year for this size lab [eia-epm-5-6-a]. Staggering chiller starts to keep peak at 70 kW instead of 85 kW saves about $2,700 per year in distribution demand alone on G-2 (input math).

Supply strategy for batch loads

Medium and large commercial Basic Service defaults to monthly pricing [ma-dpu-basic-service]. A lab with irregular production weeks sees supply cost move with ISO-NE wholesale even when delivery demand stays flat. Fixed contracts smooth budgeting; block-and-index products pass through some volatility while capping extremes. Read fixed vs index contracts before signing.

Interval meter data helps suppliers price batch load accurately. If the utility has installed AMI, pull interval data before requesting quotes. See interval data and AMI meters.

Efficiency programs

Mass Save custom incentives cover projects not on prescriptive lists, including process improvements [masssave-business-rebates]. ConnectedSolutions pays for curtailment during summer peak events [masssave-business-rebates]. A lab that can pause non-critical batch runs during dispatch events may earn revenue without capital spend.

C1D1 ventilation and continuous exhaust

C1D1 rooms require explosion-proof exhaust whenever classified equipment operates [masssave-business-rebates]. Exhaust fans add constant kW that raises baselines on demand-metered service [national-grid-ma-rates]. Right-size ventilation with mechanical engineers to avoid oversizing that persists on every bill [ma-935-cmr-500-120].

National Grid G-2 for mid-size labs

Labs under two hundred kW peak may sit on National Grid G-2 with $15.06 per kW distribution demand [national-grid-ma-rates]. Eversource G-2 uses different thresholds and twelve-month averaging [eversource-ema-rates-2026]. Site selection between Worcester National Grid and Boston Eversource labs should compare total demand dollars, not supply cents alone [national-grid-ma-rates] [eversource-ema-rates-2026].

Medium and large C and I Basic Service defaults to monthly pricing [ma-dpu-basic-service]. Labs between supplier contracts feel ISO-NE winter spikes immediately [ma-dpu-basic-service].

Mass Save custom path

Custom incentives cover process improvements not on prescriptive lists [masssave-business-rebates]. Submit engineering data before ordering specialized chillers [masssave-business-rebates]. Supply choice is independent of rebate eligibility [masssave-business-rebates].

ISO-NE supply on monthly Basic Service

Labs without supplier contracts on medium or large C and I service default to monthly Basic Service [ma-dpu-basic-service]. Winter ISO-NE prices can spike supply while batch demand stays flat [ma-dpu-basic-service]. Fixed contracts separate supply volatility from operational scheduling [ma-dpu-competitive-supply-overview].

National Grid TOU overlap

Labs in Worcester on National Grid G-2 avoid G-3 TOU until demand exceeds 200 kW [national-grid-ma-rates]. Boston Eversource G-2 uses twelve-month average demand classification [eversource-ema-rates-2026].

C1D1 ventilation and continuous exhaust

C1D1 rooms require explosion-proof exhaust whenever classified equipment operates [masssave-business-rebates]. Exhaust fans add constant kW that raises baselines on demand-metered service [national-grid-ma-rates]. Right-size ventilation with mechanical engineers to avoid oversizing that persists on every bill [ma-935-cmr-500-120].

Product manufacturer licensing context

935 CMR 500.120 energy and environmental standards apply specifically to Marijuana Cultivators, not product manufacturers [ma-935-cmr-500-120]. Extraction labs still face C1D1 ventilation and fire code requirements that create continuous exhaust load [masssave-business-rebates]. When siting a lab, compare National Grid G-2 demand thresholds against Eversource G-2 twelve-month averaging rules before assuming the same peak kW yields the same bill [national-grid-ma-rates] [eversource-ema-rates-2026].

The DPU competitive supply overview describes product types available from licensed suppliers, including fixed, index, and block-and-index structures [ma-dpu-competitive-supply-overview]. Labs on monthly Basic Service should treat supplier procurement as a hedge against ISO-NE winter volatility, separate from batch scheduling that manages delivery demand [ma-dpu-competitive-supply-overview] [ma-dpu-basic-service].

ISO-NE winter supply on monthly Basic Service

Labs without supplier contracts on medium or large C and I service default to monthly Basic Service [ma-dpu-basic-service]. Winter ISO-NE prices can spike supply while batch demand stays flat [ma-dpu-basic-service]. Fixed contracts separate supply volatility from operational scheduling [ma-dpu-competitive-supply-overview].

Product manufacturer credentials count

The Commission oversees product manufacturers alongside cultivators under adult-use rules [ma-ccc-10b-sales-2026]. Shared campus meters inherit grow class and Basic Service default [ma-dpu-basic-service].

Additional procurement and tariff notes

C1D1 exhaust runs continuously during classified operation [masssave-business-rebates]. Oversized ventilation persists on every bill [national-grid-ma-rates].

Additional load and utility notes

Labs under 200 kW may sit on National Grid G-2; Eversource uses twelve-month averaging [national-grid-ma-rates] [eversource-ema-rates-2026].

Additional load and utility notes

Mass Save custom incentives cover non-prescriptive chillers [masssave-business-rebates]. Supply choice is independent of rebate eligibility [masssave-business-rebates].

Additional load and utility notes

Winter ISO-NE Basic Service spikes hit labs without supplier contracts [ma-dpu-basic-service]. Fixed contracts separate supply from batch scheduling [ma-dpu-competitive-supply-overview].

Separate meters for fire code

Fire code may require separate meters for processing; enroll supply on each before energization [ma-dpu-competitive-supply-overview]. Mass Save custom path funds process chillers with engineering analysis [masssave-business-rebates]. Winter Basic Service spikes hit labs without contracts [ma-dpu-basic-service].

C1D1 baseline kW illustration

Assume 45 kW continuous C1D1 exhaust plus 80 kW batch chillers (inputs). Monthly peak may stack both in one interval [national-grid-ma-rates]. Mass Save custom funds engineered chiller projects [masssave-business-rebates]. Fixed supplier contracts hedge monthly Basic Service [ma-dpu-basic-service].

Supplemental tariff and procurement detail

National Grid G-2 under 200 kW may fit mid-size labs; Eversource uses twelve-month averaging [national-grid-ma-rates] [eversource-ema-rates-2026]. Mass Save custom covers process chillers [masssave-business-rebates]. Winter Basic Service spikes hit default-service labs [ma-dpu-basic-service].

Lab demand and Basic Service

Mid-size labs on National Grid G-2 or Eversource G-2 need supplier contracts before winter Basic Service spikes [ma-dpu-basic-service] [national-grid-ma-rates]. Mass Save custom funds engineered chillers [masssave-business-rebates].

Separate meter supply enrollment

Fire code separate meters need supply enrollment before energization [ma-dpu-competitive-supply-overview]. Winter Basic Service spikes hit default-service labs [ma-dpu-basic-service].

C1D1 baseline documentation

Document continuous C1D1 kW in supplier RFP data room [masssave-business-rebates].

Fire code meters and winter Basic Service

Fire code may require separate meters for extraction and retail on shared campuses [ma-dpu-competitive-supply-overview]. Each meter needs supply enrollment before energization or the account rides monthly Basic Service at ISO-NE index [ma-dpu-basic-service]. Winter Basic Service spikes hit default-service labs harder than fixed contracts because batch kWh stays flat while supply price moves [ma-dpu-basic-service]. Document continuous C1D1 kW in the supplier RFP data room so block-and-index quotes price ventilation baseline separately from chiller spikes [masssave-business-rebates]. National Grid G-3 time-of-use peak hours 8 a.m. to 9 p.m. weekdays overlap typical batch start times in Worcester industrial parks [national-grid-ma-rates].

Chiller sequencing checklist

Start chillers before vacuum ovens when ramp times differ [national-grid-ma-rates]. Log which fifteen-minute interval set the last three months' peaks before supplier quotes [ma-dpu-competitive-supply-overview].

Related pages

See cultivation facility energy for canopy-specific rules, commercial rates for tariff tables, National Grid Massachusetts for Worcester territory detail, and the switching guide for enrollment steps.