Michigan Cannabis Cultivation Facility Energy: DTE D4 vs D11, Consumers GSD, and Cold-Climate Loads

What an indoor grow looks like to DTE or Consumers

Michigan's cultivation market is fragmented: roughly 800 Class C grower licenses at up to 2,000 plants each, plus Excess Grower sites stacking multiple Class C licenses [growgoyle-mi-q3-2026]. Unlike Ohio's 37 large cultivator sites, Michigan has hundreds of mid-sized grows that peak in the 200 to 600 kW range.

A utility sees the same flat lighting block as anywhere, but Michigan's cold climate adds long winter heating and year-round dehumidification [noaa-cag-michigan]. Billing demand may peak in summer from dehumidification or in winter from heating and humidity control, depending on envelope quality and equipment sequencing.

Rate classes that matter

DTE Electric

Rate	Description	Demand billing
D3	General Service, energy-only secondary, up to 1,000 kW at company option [dte-rate-book]	No demand charge; 6.670 cents/kWh distribution energy
D4	Large General Service, demand-metered secondary [dte-rate-book]	27.10 dollars/kW distribution demand plus 9.18 dollars/kW capacity and 7.48 dollars/kW non-capacity on full service [dte-rate-book]
D11	Primary Supply, 50 kW minimum contract [dte-rate-book]	7.15 dollars/kW distribution at primary under 24 kV [dte-rate-book]

Large grows are usually served under D4 unless they take primary voltage and move to D11 [dte-rate-book]. The D4-to-D11 spread on distribution demand alone is the biggest tariff lever in the state.

Consumers Energy

Secondary business service is Rate GS (energy-based) or Rate GSD (General Service Secondary Demand) for demand-metered accounts [consumers-large-business-rates]. Primary-voltage customers may take GP, GPD, or GPTU depending on load factor and time-of-use profile [consumers-large-business-rates]. Confirm current per-kW figures on the rate book before budgeting.

Worked example: DTE D4 vs D11 on the same load

Assume a 400 kW billing demand, 280,000 kWh monthly use, DTE full service:

Rate D4 (secondary, illustrative):

• Distribution demand: 400 kW x $27.10/kW = $10,840/month [dte-rate-book]
• Capacity demand: 400 kW x $9.18/kW = $3,672/month [dte-rate-book]
• Non-capacity demand: 400 kW x $7.48/kW = $2,992/month [dte-rate-book]
• Energy at Michigan commercial average 16.63 cents/kWh: 280,000 x $0.1663 = $46,564/month [eia-epm-5-6-a]

Demand components alone exceed $17,500 per month before energy. This is illustrative; confirm current rate book figures against any 2026 rate-case order [dte-rate-book].

Rate D11 (primary under 24 kV, same 400 kW):

• Distribution demand: 400 kW x $7.15/kW = $2,860/month [dte-rate-book]

The distribution demand line drops by about $8,000 per month in this example. The trade-off is customer-owned transformer, primary infrastructure, and on choice, self-arranged capacity [dte-rate-book].

Cold climate, dehumidification, and CO2

Michigan averages 6,745 heating degree days and 579 cooling degree days [noaa-cag-michigan]. Winter envelope losses drive sensible heating load. Lake-effect moisture keeps outdoor humidity high in shoulder seasons [noaa-cag-michigan]. In sealed flowering rooms, plant transpiration and grow lights set latent load, so dehumidification runs even when the chillers are idle.

See HVAC sizing for grow rooms and CO2 supplementation cost for load interactions.

Choice cap and near-term strategy

DTE and Consumers have been at the 10 percent choice cap since roughly 2010 [mpsc-choice-2025-report]. Enter the queue at service application, but plan on full service for years [mpsc-choice-2025-report]. Near-term savings come from:

1. Primary voltage and D11 or GPD placement
2. LED retrofit with DTE AG-30/31 or Consumers AG211 rebates [dte-ee-catalog-2026]
3. Peak management to limit on-peak billing demand ratchets [dte-rate-book]

Excess Grower sites and stacked Class C licenses

Michigan allows Excess Grower licenses that stack multiple Class C authorizations at one address [growgoyle-mi-q3-2026]. Electric load scales with canopy, not license count on paper. A site with four Class C licenses under one Excess Grower can exceed 800 kW and force primary service planning early [growgoyle-mi-q3-2026]. Utility engineers should receive canopy and lighting schedules before service design is finalized.

Winter envelope performance in 6,745 HDD

Michigan's long heating season punishes poorly insulated flower rooms [noaa-cag-michigan]. Double-layer polyethylene, insulated panel walls, and vestibules reduce simultaneous heating and dehumidification conflict. Weatherization spending lowers both kWh and peak kW when HVAC does not fight the envelope. See weatherization for indoor grow.

LED retrofit interaction with DTE AG rebates

DTE pays per-kWh saved for qualifying LED conversions with minimum 2.10 micromol/J efficacy [dte-ee-catalog-2026]. Retrofit reduces energy charges but peak kW may drop only if HVAC and dehumidification are right-sized after load reduction. Reserve rebate funds before ordering fixtures; 2026 electric funds were partially depleted at research time [dte-ee-catalog-2026].

On-site solar reality in Michigan

Michigan's solar resource is moderate and winter production is low [noaa-cag-michigan]. On-site solar rarely offsets a 400 kW lighting block but can shave office and veg-room load. Pair with battery storage guidance only after tariff modeling on full service.

Class A and B micro-growers

Michigan still licenses Class A (100 plants) and Class B (500 plants) growers [growgoyle-mi-q3-2026]. These sites may peak under 100 kW and stay on D3 or GS if the utility agrees [dte-rate-book]. Do not assume demand metering is inevitable at small canopy scale.

Demand response and curtailable loads

Michigan utilities run peak-shaving programs for commercial customers, but cannabis cultivation has limited curtailable load without crop risk. Evaluate programs only for veg-room loads that can tolerate brief dimming if the utility offers horticulture-friendly terms [dte-ee-catalog-2026]. Most Class C operators skip DR entirely and focus on D11 primary conversion instead [dte-rate-book].

D4 vs D11: the primary-voltage decision

DTE Rate D4 carries a $27.10 per kW distribution demand charge on full service [dte-rate-book]. DTE Rate D11 Primary Supply at 50 kW minimum contract capacity charges $7.15 per kW at primary voltage under 24 kV [dte-rate-book]. Assume 400 kW billing demand: D4 distribution demand alone is about $10,840 per month vs D11 at about $2,860 before capacity and non-capacity lines [dte-rate-book]. The trade-off is customer-owned transformer, primary infrastructure, and on choice separate capacity arrangement [dte-rate-book].

Consumers GSD and primary alternatives

Consumers Rate GSD bills capacity and distribution per kW of on-peak or maximum demand [consumers-large-business-rates]. High load-factor primary customers may qualify for GPD or GPTU time-of-use schedules [consumers-large-business-rates]. Pull current per-kW figures from MPSC No. 14 sheets D-51.00 and D-59.00 before budgeting [consumers-large-business-rates].

Rebates that name cannabis explicitly

DTE AG-35 HVAC reduction explicitly applies to year-round indoor cannabis grow rooms [dte-ee-catalog-2026]. DTE AG-30/31 covers LED grow lights by efficacy tier [dte-ee-catalog-2026]. Consumers AG211 Agricultural LED Grow Lighting requires pre-notification [consumers-ee-business]. Reserve rebates before purchasing fixtures [dte-ee-catalog-2026].

Excess Grower single-meter peaks

Excess Grower licenses stack Class C allowances at one site, creating single-meter peaks above typical Class C loads [growgoyle-mi-q3-2026]. These sites should evaluate D11 or GPD primary service during initial design [dte-rate-book] [consumers-large-business-rates]. Queue enrollment remains mandatory at application [mcl-460-10a].

Worked D4 vs D11 monthly demand comparison

Assume 400 kW billing demand on DTE full service [dte-rate-book]. D4 distribution demand at $27.10/kW is about $10,840 per month [dte-rate-book]. D11 primary distribution at $7.15/kW is about $2,860 per month [dte-rate-book]. Difference of roughly $8,000 per month exceeds many hypothetical AES savings while cap is full [mpsc-choice-2025-report]. Add capacity and non-capacity lines from current rate book before deciding [dte-rate-book].

LED rebate reservation workflow

DTE AG-30/31 and Consumers AG211 require reservation before fixture purchase [dte-ee-catalog-2026] [consumers-ee-business]. Custom rebates cap at 75 percent of implementation cost on DTE [dte-ee-catalog-2026]. See Michigan LED retrofit case study.

Full-year load planning in 6,745 HDD climate

Winter envelope loss and make-up air dominate kWh [noaa-cag-michigan]. Sealed rooms still need dehumidification year-round [noaa-cag-michigan]. Summer cooling is modest at 579 CDD [noaa-cag-michigan]. D4 vs D11 decision worth thousands monthly at four hundred kW [dte-rate-book].

Reserve DTE AG or Consumers AG211 before LED purchase [dte-ee-catalog-2026] [consumers-ee-business]. Queue enrollment mandatory [mcl-460-10a]. Excess Grower stacked licenses need primary service planning [growgoyle-mi-q3-2026].

Model D11 transformer capex against five years of D4 demand savings before board vote [dte-rate-book].

Compliance and documentation practices

Maintain a utility folder with the current tariff PDF, last twelve months of bills, interval exports, queue confirmation letters where applicable, CRES contracts, and witness test reports [eia-epm-5-6-a]. Update the folder after every rate case order and every June benchmark reset [dte-rate-book]. Facility managers should reconcile billing demand to interval peaks monthly and escalate discrepancies to the utility account manager before paying disputed invoices [consumers-large-business-rates]. Corporate finance should map utility COGS to cultivation, processing, or retail cost centers consistently across sites so board reporting reflects operational reality rather than blended averages [noaa-cag-michigan]. Legal should keep meter assignment language in leases aligned with the license holder entity on the utility account [growgoyle-mi-q3-2026].

Model D11 transformer capex against five years of D4 demand savings before board vote [dte-rate-book].

Compliance and documentation practices

Maintain a utility folder with the current tariff PDF, last twelve months of bills, interval exports, queue confirmation letters where applicable, CRES contracts, and witness test reports [eia-epm-5-6-a]. Update the folder after every rate case order and every June benchmark reset [dte-rate-book]. Facility managers should reconcile billing demand to interval peaks monthly and escalate discrepancies to the utility account manager before paying disputed invoices [consumers-large-business-rates]. Corporate finance should map utility COGS to cultivation, processing, or retail cost centers consistently across sites [noaa-cag-michigan]. Legal should keep meter assignment language in leases aligned with the license holder entity on the utility account [growgoyle-mi-q3-2026].

Related reading

• Michigan hub: market overview
• DTE Energy utility page: D4 and D11 detail
• Commercial electricity rates: benchmarks
• LED retrofit case study