EV Charger Submeter: Who Pays in a Shared Garage

A garage submeter counts kilowatt-hours. The bill that arrives at the association usually has two quantities on it, and only one of them is kilowatt-hours.

That gap is where shared-garage charging arrangements quietly leak money, and it stays invisible until somebody reconciles a full year of them. But it is not even the first problem. Before anyone argues about how to split a cost, four state legislatures have answered a more basic question four different ways: does there have to be a meter at all?

Everything quoted below was read on 29 September 2026 and the links rechecked on 30 September, and every citation but one links to a document you can open and read the quoted words in. The exception is the National Electrical Code, which is copyrighted, and it is flagged where it comes up. I am not a lawyer, not an electrician and not a weights and measures inspector — this is a reading of statutes, administrative rules and one national standard, so that you can take the section numbers to whoever is deciding your building's policy.

Four states, four different answers to "must there be a meter"

Pick your row by relationship, not by state. Florida's rule binds a condominium unit owner; Colorado has one section for association members and a near-identical one for tenants; Illinois splits owners (§30) from renters (§35). Reading the landlord provision when you are an owner, or the reverse, is the most common way this goes wrong.

Then read Florida and Colorado side by side — same relationship, opposite drafting, and that difference is the whole argument. Florida names hardware. Colorado names an outcome and lets the association reach it with or without a meter. Illinois names two permitted methods and caps the result. California names who pays and stops.

Colorado's structure is easy to misread as permission. The operative verb is a prohibition: an association "shall not ... assess or charge a unit owner any fee for the placement or use of an electric vehicle charging system," and the actual-cost reimbursement and the access fee are the two exceptions carved out of that ban. Nothing in the section, it adds, requires an association to impose any fee at all beyond the regular assessments.

Illinois has a second copy of that two-method sentence in its tenant section, and the two copies are not attached to the same thing. In 765 ILCS 1085/35(d)(1)(A) the methods hang off a paragraph about damages — the tenant is responsible for costs "for damages to the electric vehicle charging system and to any other property of the landlord or another tenant," and then "costs under this paragraph shall be based on" the submeter or the EPA calculation. Only subparagraph (B), which says the purpose is "reasonable reimbursement of electricity usage," reveals what the drafters meant. The owner-side version at §30(e)(2)(C) attaches the same two methods directly to "costs of electricity." Same session law, same two methods, one of them bolted to the wrong sentence. If you are a tenant rather than an owner, the split between the two sections matters for more than this, and the lease side has its own set of traps.

A note on source grade, because it changes how much weight these rows carry. Florida's and California's are state servers. The Illinois and Colorado rows are commercial reprints marked current only to 1 January 2025, with no amendment history line to check that against, which means an amendment passed since then would not appear.

Illinois is a reprint for a reason worth stating plainly: ilga.gov, the state's own server, would not serve these two sections at all on 29 or 30 September 2026. It was not a slow page or a blocked crawler — the connection to port 443 never completed, timing out from one network and being actively refused from a second, unrelated one. A dead state link is worse than an honest reprint, so the rows point at text that actually opens. If Illinois or Colorado is your state, take the section number to a county law library or retry the state server, because the reprint is where an amendment would go missing first.

Charge by the kilowatt-hour and the charger becomes a commercial measuring device

Here is the part that almost never appears in a board packet. The moment the number on a charger's display determines what somebody owes, the charger stops being an appliance and becomes a commercial measuring instrument — the same legal category as a fuel dispenser or a grocery scale.

The governing document is Section 3.40 of NIST Handbook 44, Electric Vehicle Fueling Systems. The 2026 edition records its own history in the opening lines: added as a "tentative code" in 2015, changed from tentative to permanent effective 1 January 2023. Paragraph A.1 sets the scope, and the wording is broad on purpose — the code applies to equipment used for the measurement of electricity dispensed in vehicle fuel applications "wherein a quantity determination or statement of measure is used wholly or partially as a basis for sale or upon which a charge for service is based."

Wholly or partially. A submeter reading that feeds a spreadsheet that produces a line on an assessment statement is a quantity determination used partially as the basis for a charge.

Three exceptions follow, and the two that could apply to a garage are narrower than people assume. A.2.(a) exempts measuring devices "owned, maintained, and used by a public utility or municipality" only in connection with electricity subject to the authority having jurisdiction — the utility's own revenue meter, in other words, not yours. A.2.(b) exempts equipment "used solely for dispensing electrical energy in connection with operations in which the amount dispensed does not affect customer charges or compensation." A.2.(c) covers wholesale delivery and will not come up in a residential garage. A garage where charging is free sits squarely inside A.2.(b). A garage that bills per kWh sits squarely outside it.

Two states have written that conclusion down in plain language. The CALeVIP guide to California regulations for charging stations states that non-commercial applications are exempt from the Division of Measurement Standards regulation, and that the exemption "includes multi-unit dwellings (MUDs) that only offer charging to its residents and do not charge a fee based on unit of energy or unit of time." Both halves have to be true — resident-only and not priced by energy or time. Treat that document for what it is, though: a program guide summarising four agencies' rules, stamped CSE-CALeVIP-012025, not the regulation itself. The regulation lives with CDFA's Division of Measurement Standards, which hosts the EVSE rule and its FAQ; the MUD sentence is the guide's paraphrase and does not appear on the agency page.

Vermont's weights and measures section is blunter in its EVSE handout: it will be testing and inspecting supply meters used commercially in direct sale to consumers, not those operated by a public utility system, and "devices where electricity is supplied for free will not be considered commercial as no transaction is taking place."

What being in scope actually drags in:

• Accuracy tolerances. For AC systems, T.2.1 sets an acceptance tolerance of 1.0 percent and a maintenance tolerance of 2.0 percent. For DC, T.2.2.(a) leaves older Class 5 equipment placed in service before 1 January 2025 at 5.0 percent until that paragraph expires on 1 January 2034, and T.2.2.(b) puts everything else at 1.0 and 2.0 percent — with a blanket note that DC equipment placed in service before 1 January 2025 is exempt from the requirement until 1 January 2028.
• Resolution. S.1.3.2 caps the smallest indicated unit at 0.0001 kWh for AC systems and 0.001 kWh for DC.
• A receipt. UR.3.3 requires a printed or electronic receipt available at the completion of every transaction, listing quantity with units, total computed price, unit price, the maximum rate of energy transfer and type of current, any separate time-based fees with their start and end, the final total, the unique EVSE identification number, and — the two that read oddly in a residential garage — the business name and the business location.
• A name on the wall. UR.2.5 requires an unattended unit to display, on the device or immediately adjacent to it, the name, address and phone number of the local responsible party. Put that beside the receipt's business-name field and a board is being asked, twice, to decide what the association calls itself when it sells electricity.
• Method of sale. Vermont's handout points at NIST Handbook 130: retail electrical energy sold as vehicle fuel must be sold in kilowatt-hours, with unit price displayed in whole cents or tenths of a cent.
• Who installs it. California requires commercially operating equipment to be placed in service by a Registered Service Agency and to display a county approval seal. Vermont requires, after 1 January 2024, that commercial equipment be placed into service by a service person registered with its weights and measures program.

Enforcement does not sit with the utility or with the building department. NIST's electric vehicle fueling FAQ sends anyone with "a complaint and/or inquiry" to their state weights and measures program — the question it answers is phrased around a publicly accessible charger, so a resident-only garage is not squarely the case it contemplates, which is a gap worth noticing rather than papering over. The same FAQ notes that the national work group behind these requirements was formed in 2012 as the U.S. National Work Group for Electric Vehicle Fueling and Submetering, chartered for "commercial electricity-measuring devices (i.e., residential sub-metering, electric vehicle dispensers)." Residential submetering is named in the charter. This was never only about highway fast chargers.

The checkable consequence is a purchasing question, and Vermont puts it more usefully than a summary would: every manufacturer makes both commercial and non-commercial equipment, "so make sure you ask the installer/manufacturer if the device meets all these requirements if you intend to charge for the power provided by this equipment." Model numbers that have passed type evaluation appear in the NTEP Certificates of Conformance database, which carries a dedicated EVSE device category; California maintains its own CTEP list and may accept NTEP certification in lieu of it, provided the device type also meets California's own requirements. The phase-in there ran newly installed AC equipment from 1 January 2021 and newly installed DC from 1 January 2023 — and equipment already in the ground gets until 1 January 2031 for AC and 1 January 2033 for DC, which is the row most existing garages are actually in.

Ask for the certificate number before the quote is approved, not after the first dispute. Retrofitting a legal-for-trade device costs more than specifying one.

Four ways to count the electricity, and what each one really costs to own

The one that ends most board discussions early is the first, and for a reason nobody expects: it is not merely expensive to build, it is expensive to own. A dedicated meter can put that space on a tariff of its own, with a fixed monthly customer charge that lands whether the car charges or not, and there is no guarantee the residential EV time-of-use schedule is even available behind a common-area service. The arithmetic for reading that schedule is the same one used for a house, and it is worth doing before committing to hardware — the tariff sheet, not the marketing page, holds the overnight price.

The third row is the quiet favourite of anyone who has ever replaced a charger. A revenue-class submeter on the branch circuit does not care which brand hangs downstream of it. Texas writes the accuracy reference for exactly this class of device into its submetering rule: a tenant-requested meter test passes or fails against "the accuracy standards for self-contained watt-hour meters as established by the latest edition of American National Standards Institute, Incorporated, (ANSI), Standard C12 (American National Code for Electricity Metering)" — 16 TAC §25.142(f)(4). Note what the rule points at: a published accuracy standard, not a marketing phrase. "Revenue grade" appears in no standard and no statute quoted on this page. So when a product sheet uses it, ask which C12 accuracy class the meter meets and who verified that — the answer is a document, and the C12 standards themselves sit behind a paywall, so it is a question for the vendor rather than something a board can look up for free.

The common-area bill has a second quantity on it, and no submeter reads it

This is the reconciliation failure I opened with, and it is structural rather than anyone's mistake.

A residential bill is mostly energy: kilowatt-hours multiplied by a rate, plus fixed charges. A common-area or house-meter account on a small commercial schedule frequently adds a demand charge — dollars per kilowatt of the highest short-interval average demand in the month, often a 15-minute interval, sometimes ratcheted so that one bad month sets a floor for the next eleven.

A submeter measures energy. It has no opinion about when that energy arrived. Two residents can draw identical monthly kilowatt-hours and produce completely different demand outcomes: one plugs in at eleven at night when the elevator and the garage lighting are quiet, the other arrives at six in the evening alongside everything else in the building. Allocate strictly by kilowatt-hours and the second resident's contribution to the peak is paid for by everyone, including the residents with no car.

Finding out whether this applies to your building takes one bill and about five minutes.

1. Identify the account. The garage is often on a house meter serving lighting and elevators, not on any unit's account.
2. Find the tariff or rate schedule number printed on the bill, then pull that schedule from the utility's tariff library.
3. Look for a line quoted in kW rather than kWh — labelled Demand, Billing Demand, Maximum Demand or similar — and for the interval that defines it.
4. Check for a ratchet clause, a seasonal split, and any minimum demand.
5. Divide the total invoice, taxes included, by the total kilowatt-hours to get the account's blended cost per kWh. That number, not a state or national average, is what "actual cost of electricity" means for this building.

Step five is also the computation Texas puts in its rule. Under §25.142(d)(1)(G) an apartment owner "shall divide the net total charges for electrical consumption, plus applicable tax, by the total number of kilowatt-hours to obtain an average cost per kilowatt-hour," then multiply by each tenant's consumption — excluding any disconnect, reconnect or late-payment penalties the utility charged the owner. It is a blended rate by design, and it is the most defensible arithmetic available to a board that is not going to install demand metering per space.

Two ways out, if the demand exposure turns out to be real. Cap it in hardware, by running the chargers under a load-management scheme so that total garage demand cannot exceed a set ceiling. Or allocate it separately, by measuring each space's contribution to the coincident peak — which requires interval-capable submeters and a policy nobody will read. Most buildings should price the first option before designing the second.

A flat monthly fee is not laziness; it moves the risk somewhere else

Colorado's alternative — "a reasonable fee for access" — deserves more respect than it usually gets.

Its advantages are exactly the disadvantages of metering. Nothing to certify, nothing to calibrate, no type-approval certificate to chase, no receipt requirement, and, if the fee is genuinely not based on units of energy or time, arguably no weights and measures exposure at all under the same reasoning the CALeVIP guide sets out for multi-unit dwellings. Collection is a line on the monthly statement instead of a billing platform with a subscription.

Two cautions on reading Colorado as a green light. It is drafted as an exception to a prohibition, so the fee has to fit one of the two carve-outs rather than merely seem fair; and the association and tenancy versions sit in different titles — §38-33.3-106.8(2)(b) for common interest communities, §38-12-601(1)(b)(I) for leases — so quoting the landlord provision in a condominium policy cites the wrong statute for the wrong relationship.

What it buys instead is a cross-subsidy nobody can audit. Set one number for every charging space and the resident driving twenty thousand miles a year pays what the resident who charges twice a month pays. Nothing in a flat fee self-corrects when usage patterns change, and there is no meter reading to point at when someone challenges it.

Statutes that permit a flat fee still cap it. Illinois §30(e)(3) states the purpose is reasonable reimbursement of electricity usage and that costs "shall not be set to deliberately exceed the reasonable reimbursement." Colorado's own limit is the word reasonable and nothing else. In practice a flat fee is defensible in proportion to the work shown behind it: the account's blended cost per kWh, an assumed monthly consumption with its source, and a review date. Set it from the arithmetic of what an overnight charge actually consumes rather than from a round number that felt safe at a board meeting, and write the review date into the policy so the number is scheduled to be wrong rather than permitted to drift.

The EPA-efficiency calculation, and the two numbers people plug into it wrong

Illinois' second permitted method is the only cost formula written into any of these statutes, and it needs three inputs: average miles driven, the vehicle's EPA efficiency figure, and the cost of electricity for the common area.

Two of the three get filled in badly.

Average miles driven. The temptation is a national average, because it is easy to cite and it appears in every article about electric cars. It is also not the driver in question. The defensible input is odometer readings — one at the start of the billing period, one at the end — which turns an assumption into a measurement both sides can check. Most disagreements about this method are really disagreements about this input.

The EPA figure. The kilowatt-hours-per-100-miles number on the window sticker is, in the words of the federal label guide, "an estimated rate of consumption" — and the same page volunteers the caveat that "any given vehicle may or may not be actually capable of traveling 100 miles on a fully charged battery." It comes out of a laboratory procedure — the Multi-Cycle Range and Energy Consumption Test, which 40 CFR 600.116-12 reaches by incorporating SAE J1634 by reference — run under conditions that are not a cold garage in February with the cabin preheating on a timer. It is a reasonable estimator and a poor measurement, which is exactly why the statute pairs it with the word reasonable and caps the result at reimbursement. When the government that publishes a number tells you it is an estimate, a billing formula built on it inherits that.

The third input, the cost of electricity for the common area, is the blended figure from the previous section. Use the building's own number. A rate pulled from a state average will be wrong in a direction nobody can predict, and it will be wrong every month.

One failure mode kills the method outright regardless of inputs: a resident who charges at work, or on the road, or at a relative's house. Miles driven stop tracking kilowatt-hours delivered in this garage, and the estimate drifts with no signal that it has. If a building has residents like that — and most do — the calculation needs an agreed adjustment or it needs to be a meter. Drivers splitting their charging between home and public networks are already reading two unrelated pricing structures, and the per-kWh and per-minute models on a public screen say nothing about what the garage costs.

Whether the association just became an electric utility

The fear that surfaces at some point in every one of these discussions is that reselling electricity is illegal. The accurate version is that two entirely separate bodies of law are in play, and the EV statutes sit in a third place from both.

Am I a public utility? Several states have answered no by statute. Fla. Stat. §366.94 provides that "the provision of electric vehicle charging to the public by a nonutility is not the retail sale of electricity for the purposes of this chapter," and that the rates, terms and conditions of such service are not subject to regulation under it. Cal. Pub. Util. Code §216(i) says that owning, controlling, operating or managing a facility that "supplies electricity to the public only for use to charge light duty plug-in electric vehicles" does not make the person a public utility solely because of that.

Read the preposition, though. Both carve-outs are keyed to supplying the public. A garage gated to residents is not obviously a public facility, which means a resident-only billing arrangement may not be inside the carve-out that was written for the network operator on the highway — and may not need to be, because it may not be a retail sale at all. That is a question for the association's counsel with both sections in hand, not one a board should resolve by analogy.

How much may I charge? This is the older body of law, and it predates electric cars by decades. Texas is the most prescriptive: an apartment owner "shall not impose any extra charges on the tenant over and above those charges which are billed by the retail electric provider or utility to the owner" (§25.142(d)(1)(F)), must render bills for the same period as the utility and read submeters within three days of the master meter reading, must keep master bills, average-cost calculations, submeter readings and submeter test results for "the current month and the 12 preceding months" available for tenant inspection (§25.142(c)(1)) — thirteen months, not twelve — and must test a submeter on a tenant's request — for up to fifteen dollars if the meter passes, free if it fails or has not been tested within a year (§25.142(f)(4)). Maryland's Public Utilities Article §7-303 permits only the utility costs the Commission authorizes and the company actually imposes, allocated by actual consumption, plus a service charge not exceeding one dollar per unit per month for administration and billing.

Now the part that matters for a garage. Texas defines electric submetering at §25.142(b)(6) as "individual dwelling unit metering of electric service performed by the owner," and its master-meter definition at (b)(3) expressly covers common areas, common facilities and dwelling units together. Then §25.142(d)(1)(E) allocates the consequences: "The bill shall reflect only submetered usage. Utility consumption at all common facilities will be the responsibility of the owner and not of the tenant." A parking space is not a dwelling unit. The phrase electric vehicle does not appear anywhere in the rule — I searched the full text of both §25.141 and §25.142 on 29 September 2026 and found zero occurrences.

So a Texas apartment owner billing a tenant for garage charging is not operating under the submetering rule at all; that rule was built for a different measurement, and its structure points the other way. What authorises the charge, if anything does, is the lease. Which is the same answer as in every state with no EV statute, and the reason the owner-side right-to-charge statutes are worth checking first — they are where a billing method becomes a legal entitlement rather than a negotiation.

One approval, and the obligations that outlive the owner who asked for it

A board approving a single charger is usually thinking about one resident and one wall. The statutes it is approving under attach obligations to the space, and to whoever holds it next.

Illinois §30(e)(2) binds "the unit owner, and each successive unit owner" to damage costs, maintenance, repair, replacement, restoration after removal, and the electricity costs computed by one of the two methods. Subparagraph (D) adds a disclosure duty to a prospective buyer covering the existence of the system and the owner's responsibilities under the section. Subsection (e)(4) requires a liability policy at all times, a certificate of insurance within 14 days of approval, and a new certificate annually thereafter — a recurring administrative task that boards routinely set up and then never collect.

Subsection (e)(5) is the exception that changes which residents are affected at all: no homeowner liability policy is required "for an existing National Electrical Manufacturers Association standard alternating current power plug." A resident using a cord set on a receptacle that is already there stands in a different position from a resident hanging new equipment, and that distinction runs through the billing question too, because the existing receptacle is usually on the association's circuit with no measurement on it whatsoever.

Two further asymmetries are worth knowing before a dispute rather than during one. Illinois §30(h) makes an association that willfully violates the section liable for actual damages plus a civil penalty to the unit owner not exceeding five hundred dollars; the tenant-side equivalent at §35(f) sets that penalty at up to one thousand. And the fee-shifting clauses are not parallel: §30(i) awards reasonable attorney's fees to a "prevailing party," while §35(g) awards them to a "prevailing plaintiff." An owner who sues and loses can be ordered to pay the association's fees. A tenant in the same position cannot.

California adds a procedural step that catches boards granting space rather than permission. Under Civ. Code §4600(a), granting exclusive use of any portion of the common area to a member requires the affirmative vote of members owning at least 67 percent of the separate interests — "unless the governing documents specify a different percentage," so check your own declaration before assuming the number. The exceptions at (b)(3)(H) and (b)(3)(I) cover charging stations meeting §4745 where installation requires reasonable access across the common area, and stations installed through a licence granted by the association under §4745. Which means the licence agreement is not paperwork around the decision. It is the mechanism that keeps the decision from needing a membership vote.

And when the association installs the chargers itself, the statutes split again — this time between silence and express permission.

Illinois §30(g) permits an association to install a system in the common area "for the use of all unit owners and members of the association," and says only that it "shall develop appropriate terms of use." California §4745(h) is the same shape: the association or owners may install in the common area for the use of all members, and then "shall develop appropriate terms of use." Neither says a word about cost allocation. Absent terms of use that say otherwise, the operating budget pays — which is to say every owner pays, including the ones who will never plug anything in.

Florida is the exception, and it is worth reading against its own subsection (8). Section 718.113(9) lets the board install or operate a station on the common elements "and establish the charges or the manner of payments for the unit owners, residents, or guests who use" it. It then adds that such installation, repair or maintenance "does not constitute a material alteration or substantial addition to the common elements" — which removes the owner-approval threshold that would otherwise apply. So the same statute mandates a meter when an owner installs at their own space (8)(c), and hands the board open-ended pricing discretion plus a procedural shortcut when the association installs (9). Who owns the hardware decides which rule you are under.

Either way it is a policy choice, and it should be made on purpose rather than by omission.

The shared feeder decides how many kilowatt-hours a space can even draw

One physical fact undercuts naive fairness arguments in both directions. In most retrofitted garages the chargers do not each get a dedicated feeder; they share one, under a load-management scheme. The National Electrical Code contemplates this — §625.42 permits an energy management system to establish the maximum load of charging equipment, and Article 750 governs energy management systems generally. Those two section numbers are the one place on this page without a link behind them: the NEC is copyrighted and not freely quotable, so unlike every statute above you cannot open it and check my wording in a browser. Verify them against the edition your jurisdiction actually adopted, which is the version that governs anyway.

A shared feeder means the kilowatt-hours a space records are not purely a function of that resident's car and habits. They are also a function of how many neighbours were plugged in at the same time. Two identical drivers can produce different meter readings because the system throttled one of them. Bill per kilowatt-hour and that is fine, because each is billed for what was received. Bill a flat fee and the resident who is systematically throttled pays what the resident sitting at the front of the sequencing logic pays.

Which edition of the code applies is a separate question from what the model code says, because states and municipalities adopt editions on their own schedules and amend them on the way in. Whether a load-management scheme is an alternative to new service capacity is the same argument that decides residential installs, and it has four recognisable ways to avoid a service upgrade. The final call on any of it belongs to the authority having jurisdiction, not to the board, the vendor, or this page.

Ask for twelve months of the master bill before anyone argues about cents

Every version of this dispute that goes badly starts with a rate and works backwards. Every version that goes well starts with the invoice.

Request twelve months of the account that actually serves the garage — Texas gives tenants a right to exactly that, and it is a reasonable ask anywhere. Then, on one page, write down five things: the tariff schedule number, whether there is a demand charge and over what interval, the blended cost per kilowatt-hour from total invoice divided by total kilowatt-hours, the measurement method being proposed with the statutory subsection that permits it, and the date the arithmetic was done.

Date it, because the tariff will change, the code edition will change, and the Colorado text in the table above was current only to January 2025 with no amendment history printed on it. In an argument two years from now, the version that matters is the one neither side can produce.