A high-volume plant on CFE basic supply can cut its delivered power bill by 15% to 30% by moving to qualified supply, a range Mexico Energy Partners captures on the procurement work it runs for industrial clients. For a 2 MW site that is roughly 250,000 to 550,000 dollars a year of recurring cash. The gate is a load center at or above 1,000 kW of measured demand, and the one-time cost of walking through it is small against the annual prize.
The mistake buyers make is treating this as a switching decision. It is a procurement decision. The discount is real, and the arithmetic behind it is visible in the tariffs. Whether a plant keeps 25% or gives half of it back in year two comes down to four terms in a supply contract. Registration as a Usuario Calificado does not settle it.
A finance director should run a framework before signing anything. It has three parts. The qualification threshold and what it costs to cross, the two procurement routes and which buyer belongs on each, and the four contract terms that determine whether the headline discount holds for the life of the deal.
Qualifying, and what the switch costs
The threshold is fixed. A load center with measured demand at or above 1,000 kW can register for qualified supply, and sites under common ownership can be aggregated to reach it. Article 73 of the Ley del Sector Eléctrico, published in the Diario Oficial on March 18, 2025, keeps this a choice, not an obligation. An eligible plant may stay on basic supply if it prefers. The 2014 autoabasto legacy structure, the old vehicle for cheap self-supply, is closed to new entrants, so qualified supply is now the principal legal path to sub-CFE pricing for a large industrial buyer.
The one-time cost of qualifying is modest and it is knowable in advance. It has three parts: bringing metering and controls to Código de Red standard, certifying the measurement point, and registering the load. On our read, for a single site this runs in the low tens of thousands of dollars and a few weeks of work. Against a recurring saving in the low-to-mid six figures of dollars a year, the payback is months, not years. The metering upgrade is worth doing on its own terms because it produces the audited consumption baseline a supplier will demand and the plant will measure savings against.
Meter and qualify first, before opening any commercial conversation. This is the step every later decision passes through, and it is cheap insurance even if the contract decision slips a quarter.
The two routes, and which buyer belongs on each
A qualified user reaches the wholesale market by one of two routes, and the choice sets how much of the spread the buyer keeps and how much risk it carries.
The first route is to register as a Usuario Calificado Participante del Mercado and buy directly in the Mercado Eléctrico Mayorista. The buyer becomes a market participant in its own right, captures the full spread between wholesale and retail, and takes on settlement, clean-certificate procurement, and ancillary-service obligations. This route needs a treasury and a market desk that can carry daily settlement risk and price volatility.
The second route is to contract through a Suministrador de Servicios Calificados. The supplier represents the load in the market and sells to the plant under a bilateral contract, usually at a covered or fixed price. The buyer trades part of the spread for a counterparty that runs the market interface and absorbs the operational machinery. Most industrial buyers below the very largest belong here, and for them the choice of supplier and the terms of that bilateral contract are the decision that matters.
| Route | Spread captured | Risk borne by buyer | Obligations taken on | Best fit |
|---|---|---|---|---|
| Usuario Calificado Participante del Mercado | Full spread, less internal cost | Settlement risk, spot-price volatility, node basis, certificate sourcing | Direct MEM participation, daily settlement, CEL retirement, ancillary services | Very large loads with treasury depth and a dedicated energy desk |
| Suministrador de Servicios Calificados | Partial spread, supplier keeps a margin | Counterparty credit risk, contract-term risk | Meet contract terms, pay porteo and supplier invoice | Most industrial buyers from ~1 MW up to large multi-site groups without a market desk |
The trade-off is clean. Direct participation keeps more of the spread and all of the risk. Contracting through a supplier gives up a margin in exchange for someone else carrying the market. Neither is right in the abstract. It depends on load size, treasury appetite, and whether the plant wants energy trading anywhere near its P&L.
What qualified supply saves, and what stays fixed
Split the bill into the part that moves and the part that does not.
The part that does not move is demand and transmission. On the CFE Gran Demanda en Media Tensión Horaria tariff for the Aguascalientes zone in July 2026, the capacity charge is 377.16 pesos per kW-month and the distribution charge is 97.88 pesos per kW-month, together about 475 pesos per kW of billing demand. A 2 MW site pays roughly 950,000 pesos a month on those two charges alone, about 55,000 dollars at the DOF reference rate of 17.39 pesos per dollar on July 16, 2026. That is close to 655,000 dollars a year before a single kilowatt-hour of energy is counted, and qualified supply does not touch it. A supplier's pitch that implies otherwise is overstating the prize.
The part that moves is energy, and for a continuous industrial load it is the larger slice. A 2 MW plant running near its rated draw most of the year consumes on the order of 12 to 15 GWh, on our read of a normal industrial load factor. CFE bills basic-supply energy on GDMTH at 1.0228 pesos per kWh in base hours, 1.8107 in intermediate, and 2.0620 in peak for that zone in July 2026, which is 1,023 to 2,062 pesos per MWh. The wholesale market clears well below the upper end. CENACE reported an average day-ahead local marginal price of 586.20 pesos per MWh for the week of November 2 to 8, 2025. The bundled retail tariff runs two to three times higher in peak hours. Buying the energy block near the wholesale price instead is where the discount lives. On the full delivered bill of roughly 1.7 to 1.9 million dollars a year, a 15% to 30% cut is about 250,000 to 550,000 dollars. For a 2 MW plant the fixed demand and transmission charges do not move at all. The energy block carries the whole discount.
Work out what share of your delivered bill the energy block actually is before you take any supplier meeting, because that share alone decides whether a 15% to 30% cut is worth 250,000 dollars a year to you or double that. Talk to an advisor.
Two costs move onto the buyer's own ledger under qualified supply, and both belong in the contract and not in an assumption. The first is the clean energy certificate obligation. Qualified users and their suppliers must retire certificates against a share of consumption that the energy authority sets each year, consistent with the national clean-energy target of 35% of generation set for 2024 under the Ley de Transición Energética. On basic supply this cost sits inside CFE's tariff. On qualified supply it is yours, and it needs to be an explicit pass-through with a defined price basis. The second is porteo, the regulated charge for using CFE's wires, which the qualified user pays directly and which the regulator has raised before. Leave either one open in the contract and part of the headline discount can be clawed back in year two.
The four contract terms that decide whether the discount holds
The transition captures a spread on day one. The contract decides whether that spread survives. Four terms carry the weight, and a deal that pins all four is worth more than a percentage point of headline discount that floats.
| Contract term | What a weak clause looks like | What to negotiate | P&L exposure if left open |
|---|---|---|---|
| Energy price basis | Full merchant pass-through of the wholesale price with a fixed supplier margin | Fixed or collared price, or a shared-move mechanism on the energy block | Wholesale spikes flow straight to the invoice. See the 11,339.24 pesos per MWh node print below |
| CEL / clean-certificate pass-through | Silent, or "at cost as determined by supplier" | Explicit line, defined price basis, cap or fixed unit cost | Rising annual certificate requirement erodes the discount, unquantified |
| Porteo treatment | Buyer bears all future regulated increases | Named treatment, with a mechanism for who absorbs tariff changes | A porteo increase lands entirely on the buyer mid-term |
| Supplier-default remedy | No provision, or a weak termination clause | Step-in or reassignment rights, collateral, clean exit to basic supply | Supplier failure leaves the plant scrambling for supply at spot |
Take the energy price basis first because it carries the most risk. The same CENACE week that averaged 586.20 pesos per MWh also cleared a maximum node price of 11,339.24 pesos per MWh at Cozumel and a minimum of negative 964.61 at Mazatlán, with distributed nodes averaging 609.29. A contract that passes the wholesale price straight through hands that dispersion to the buyer. The node the plant sits on matters as much as the national average. This is precisely why most industrial buyers contract a covered price instead of sitting exposed on the spot market.
The supplier-default remedy is the term buyers under-price. A private supplier now stands between the plant and the market. If that supplier is thinly capitalized and the wholesale price it must pay to serve the load rises faster than the price it locked with the buyer, its margin inverts and its ability to perform comes into question. The discount is only as durable as the entity delivering it. Diligence on the supplier's balance sheet and generation portfolio, plus contract terms that let the buyer step in or exit cleanly to basic supply, protect against a risk the headline percentage never shows.
The risk: the discount can shrink
The reform is what can take the discount back. The Ley del Sector Eléctrico writes a floor requiring the state to account for at least 54% of the energy injected into the national grid each year (Greenberg Traurig analysis of the enacted law, February 2025). On our read, a statutory floor on state generation can push CFE plants into the dispatch stack ahead of cheaper private ones, which lifts the marginal wholesale price a supplier pays to cover your load even when cheaper private capacity is idle. The reglamento took effect on October 4, 2025, but the secondary provisions that will price the floor into dispatch are not yet published. A buyer signing a long fixed-margin contract with full merchant exposure on the energy block is taking that policy risk onto its own balance sheet.
The counter-case is straightforward. The law preserves qualified supply, preserves the 1,000 kW threshold, and keeps the wholesale market as the pricing engine. CFE has its own reason to keep large industrial load in the qualified market instead of absorbing it into a subsidized basic-supply base it prefers to reserve for residential and small commercial customers. The most likely path is not the end of the discount but a narrower and more conditional one, where contract structure separates the buyers who keep 25% from the ones who keep 10%. That argues for acting deliberately and soon, not for staying put.
The steps to take, and when
Run the framework in order. Meter and qualify the load to Código de Red standard and confirm the 1,000 kW threshold, aggregating sites if needed. That produces the baseline every later step requires.
Pick the route on scale and treasury appetite, not on the headline spread. If the plant has no energy desk and no wish to carry daily settlement, contract through a Suministrador de Servicios Calificados and make the supplier choice the real diligence exercise. If the group has the size and treasury to run market obligations, direct participation keeps more of the spread.
Then negotiate the four terms as one package: a defended energy price basis, an explicit CEL pass-through with a defined price basis, a named porteo treatment, and a real supplier-default remedy. Fix the term long enough to lock today's supply and today's merit order ahead of the 54% dispatch effect.
The timing pressure is concrete. Contracts signed before the secondary rules land are negotiated against today's dispatch. Buyers who wait will negotiate against whatever the state's dispatch preference has done to marginal prices by then. For a 2 MW plant, a year of delay is 250,000 to 550,000 dollars of saving not captured, and a worse contract if the downside case is the one that plays out. Qualify now, and let the four terms, not the switch itself, carry the discount.
PPA Procurement Risk Review
We pressure-test the four terms above in a supplier's draft, price the CEL and porteo pass-throughs as explicit lines instead of assumptions, and run diligence on the counterparty before you commit to a multi-year block. Send the draft contract and twelve months of CFE bills, and the 1,000 kW threshold check runs off your metering data alone.
Talk to a Mexico Energy Partners advisor or email info@mexicoenergypartners.com. Mexico Energy Partners sells no equipment and is compensated only by the client.
Sources
- Ley del Sector Eléctrico, published in the Diario Oficial de la Federación on March 18, 2025, replacing the 2014 Ley de la Industria Eléctrica. Article 73 preserves the basic-supply option for eligible load centers.
- Reglamento de la Ley del Sector Eléctrico, published in the DOF on October 3, 2025, effective October 4, 2025.
- 54% state generation floor and self-supply permit changes. Greenberg Traurig, "Reformas al Sector Energético, Parte I: Ley del Sector Eléctrico," February 2025.
- Qualified supply saving of 15% to 30% versus CFE basic supply, and the 1,000 kW measured-demand threshold. Mexico Energy Partners procurement analysis.
- CFE Gran Demanda en Media Tensión Horaria tariffs, Aguascalientes zone, July 2026: capacity 377.16 and distribution 97.88 pesos per kW-month, energy 1.0228 (base), 1.8107 (intermediate), 2.0620 (peak) pesos per kWh. CFE tariff schedule, July 2026.
- Average day-ahead local marginal price 586.20 pesos per MWh, distributed-node average 609.29, maximum 11,339.24 (Cozumel) and minimum negative 964.61 (Mazatlán), week of November 2 to 8, 2025. CENACE weekly Mercado Eléctrico Mayorista report, November 2025.
- Clean energy certificate obligation, set annually by the energy authority, and the 35% clean-generation goal for 2024. Ley de Transición Energética, 2015.
- Reference exchange rate of 17.39 pesos per US dollar, DOF, July 16, 2026.