Power is a site-selection decision in Mexico, not a move-in task
A manufacturer taking space in Mexico usually arrives with labor cost, logistics cost and tariff treatment already modeled. Power gets left as a utility account to open after occupancy. That order is backwards here. The voltage at which a plant takes service, the demand it declares to CFE and the node it connects to are all settled at site selection. Each is expensive to change afterwards. Between them they set the tariff class, decide which suppliers may legally sell to the plant, and hold the energy price for years.
The nearshoring case rests on proximity to the United States market, on the trade framework, and on a manufacturing base that already exists. None of that is in dispute. The delivered cost of electricity is what gets mis-modeled, and it is the one operating line procurement cannot repair after the fact.
Your declared demand decides who is allowed to sell you power
Mexico splits electricity customers in two. Below the threshold, a plant buys from CFE Suministro Básico at CRE-approved regulated tariffs. At or above it, the plant can register as a Usuario Calificado and contract with a Suministrador de Servicios Calificados on negotiated terms.
The threshold is 1 MW, and it is measured in demand, not in annual consumption. That distinction is the most common error in nearshoring feasibility models. The SENER acuerdo published in the DOF on 1 March 2017 defines the demand test. For a facility in high or medium tension with recent service, it is the maximum recorded demand in kW over the preceding twelve months. For a new facility with no prior service, it is the demand the applicant declares, between 60 and 100% of installed capacity, subject to verification or a CRE-approved method.
A plant that has never operated in Mexico establishes its own eligibility for competitive supply by what it declares against its installed capacity at the design stage. A load list that is trimmed for capex reasons can put the facility below 1 MW and leave it on regulated supply with no competitive alternative. That is a decision an electrical designer makes without knowing it is a procurement decision.
Direct participation in the wholesale market is a separate and higher bar. To become a Usuario Calificado Participante del Mercado and sign a Contrato de Participante del Mercado with CENACE, the requirement is a minimum demand of 5 MW and annual consumption of at least 20 GWh, per CRE's published guidance on the Registro de Usuarios Calificados. CRE maintains that registry under the disposiciones published in the DOF on 6 December 2017. CENACE does not issue Usuario Calificado registrations, and CFE does not either. CFE is a market participant and the incumbent utility, not the regulator.
Service voltage sets the tariff class for the life of the plant
The class printed on a CFE bill is set by voltage and by demand, and the split is not where most incoming plants assume it is. GDMTO and GDMTH both cover medium tension, roughly 1 kV to 35 kV, and they divide at 100 kW of demand. GDMTO is a flat rate. GDMTH is time of use across base, intermedio and punta periods, and it is the class most mid-size Mexican plants land on. DIST covers supply taken at subtransmission voltage, roughly 35 kV to 220 kV. DIT covers supply taken directly at transmission voltage, 220 kV and above, and it is the lowest-cost industrial class.
The consequence for a site search is direct. A building served at 23 kV and a building served at 115 kV put the same load on different tariff schedules. That is structural, not negotiable. Where a park offers a choice of connection voltage, or where a substation upgrade is on the table as part of a build-to-suit, that is a capital decision with a permanent operating consequence. Model it as such. A plant of any real scale that ends up quoted on GDMTO has almost certainly been classified wrongly.
The node sets the energy price
For anything bought at market prices, Mexico prices energy nodally. The Precio Marginal Local at a given pricing node decomposes into three components: marginal energy, marginal losses, and marginal congestion, per CENACE's Diccionario de Datos Abiertos referencing the DOF note of 4 July 2016. The same hour can clear at materially different prices at two nodes, and the gap is congestion and losses rather than market noise.
Two industrial parks a hundred kilometers apart are therefore not the same energy proposition, even at identical rent and identical tariff class. Ask for the node before signing, and have suppliers price against it.
Whatever route is chosen, porteo belongs in the comparison. Transmission and distribution wheeling charges are what turn a headline generation price into a delivered price, and they are the variable that most often decides between an onsite installation and a remote contract. CRE revised the porteo estampilla tariff applicable to holders of legacy interconnection contracts in 2020, with the higher charge reported as applying from July 2020. La Jornada reported on 11 June 2020 that CFE Intermediación de Contratos Legados raised those porteo tariffs by 427 to 811% depending on voltage level. Any autoabasto structure a landlord or developer offers should be priced on post-2020 porteo, not on the economics that made those schemes attractive a decade ago.
Two claims about Mexico that need correcting
The first is the trade count. Figures as high as 46 countries circulate in nearshoring material. The Secretaría de Economía's own published count is 14 free trade agreements covering 50 countries, alongside 30 investment protection agreements with 31 countries or administrative regions and 9 limited-scope agreements under ALADI. Use the ministry's number.
The second is the claim that utilities are cheaper in Mexico. On electricity that is not a general truth and it should never be assumed in a business case. Delivered cost depends on tariff class, service voltage, load factor, the split of consumption across base, intermedio and punta, and the node. A plant with a poor load factor on GDMTH in a punta-heavy shift pattern can pay more per MWh than a comparable plant in Texas. A plant on DIT with a flat 24-hour profile can pay considerably less. The variance inside Mexico is wider than the average gap between the two countries, which is precisely why the average is useless for a site decision.
The policy risk an incoming manufacturer prices
Mexico's electricity policy has been contested throughout this period, and an incoming manufacturer should price that. The reform to the Ley de la Industria Eléctrica published in the DOF on 9 March 2021 reordered dispatch in favor of CFE's own generation and extended Certificados de Energías Limpias eligibility to clean generation regardless of commercial operation date, diluting their value for post-2014 private renewables. Its transitional provisions directed CRE to review legacy self-supply permits. Application of the reform was widely blocked by amparo suspensions.
On 7 April 2022 the Suprema Corte de Justicia de la Nación dismissed acción de inconstitucionalidad 64/2021. None of the challenged provisions drew the qualified majority of eight votes needed for a general declaration of unconstitutionality, so the reform survived in the legal order without a general ruling on its constitutionality, and lower courts remained free to decide individual amparos. On 17 April 2022 the Cámara de Diputados rejected the constitutional electricity reform, with 275 votes in favor, short of the two-thirds required.
The practical read for a plant director is narrower than the headlines. Nothing in this sequence removed the Mercado Eléctrico Mayorista, private generation permits or CENACE's role as system operator. What it did do is raise the cost of assuming that a twenty-year private supply contract carries the same regulatory certainty it would carry elsewhere. Price the contract's change-in-law provisions rather than the political forecast.
What to model before you sign the lease
- The declared demand in the electrical design, tested against the 1 MW Usuario Calificado threshold before the load list is frozen.
- The service voltage on offer at each candidate site, and the tariff class it produces.
- The pricing node for each site, and an indicative delivered price at that node from at least one qualified supplier.
- Porteo and any other pass-through charges, shown separately from the generation price in every offer.
- Available capacity at the serving substation and the interconnection timeline, obtained from CFE Distribución in writing rather than from the landlord.
- For onsite generation, whether the proposed array sits below the 0.5 MW distributed generation threshold, which is measured on generating capacity rather than on the plant's load.
Where a savings percentage is quoted against CFE supply, it is measured against your current or projected CFE tariff and moves with region, load factor and consumption profile. Treat it as illustrative until it has been rebuilt from a real load profile for the specific site. Sector matters as well, since an automotive plant and a distribution center have different load shapes and different exposure to punta pricing, even in the same park.
Pricing power before the site decision is final
Mexico Energy Partners models delivered electricity cost by candidate site for manufacturers entering Mexico, covering tariff class, node, qualified supply eligibility and supplier pricing, and works alongside the operations and logistics case rather than after it. An initial review needs the projected load list, the connected capacity, the shift pattern, and the candidate site addresses.
Request a delivered power cost model for your candidate sites