When an industrial plant crosses the 1 MW threshold and becomes a Qualified User, it stops paying a tariff and starts signing a contract. It is the most important —and most misunderstood— change in the entire migration to the Wholesale Electricity Market (MEM). With CFE Basic Supply nothing is negotiated: you take the regulated tariff the CRE publishes and you pay it. With a Qualified Supplier you negotiate the price, the term, the indexation, the guarantees, and the exit clauses. Energy stops being a fixed, imposed tariff and becomes a commercial position you manage.
That change is the source of the savings —typically 15% to 30% gross over the CFE baseline for healthy load profiles— and also the source of the risk. A well-negotiated contract locks in cost visibility for 24-60 months and shields the plant from volatility. A bad contract transfers market risk to the user, with take-or-pay clauses that punish you when production drops and spreads that eat up the promised savings.
This guide is the complete map of buying energy via a Qualified Supplier: who can do it, how the supplier is chosen, how the contract is structured, how the price is formed, what risks exist, and how they are hedged. It is a reference document; each section links to the article that goes deeper on the topic.
What buying energy via a Qualified Supplier is (and what it is not)
A Qualified Supplier (SuCal) is a private participant authorized by the CRE to buy energy in the Wholesale Electricity Market and resell it to Qualified Users through bilateral contracts. It is not an "alternative electric company": it is a commercial intermediary that gives you access to the wholesale market and manages the complexity of buying in CENACE on your behalf.
It helps to separate three things that get confused:
- Buying energy is the commercial decision: who you buy from, under what contract, and at what price. That is what this guide is about.
- Being a Qualified User is the prior regulatory requirement: the registration with the CRE that enables you to buy in the MEM. Without that status you cannot contract a SuCal. We cover it in Qualified Users: the complete guide.
- Complying with the Grid Code is the parallel technical obligation: the CRE verifies that your facility complies as a condition to authorize and maintain your participation. See Grid Code 2026: the complete guide.
Buying energy via a SuCal does not mean cutting ties with CFE either. The grid is still operated by CFE Transmission and CFE Distribution, and CENACE coordinates the system. Only who bills you for the energy, and under what terms, changes. The technical reliability of your supply does not change.
Who can buy energy in the MEM
Access to the wholesale market has a single point of entry: being a Qualified User, which requires an annual average demand equal to or greater than 1 MW (1,000 kW) per load point, or aggregated across plants of the same group under the rules in force.
If you do not know whether your plant crosses that threshold, before talking to any supplier it is worth validating it with real data. We explain it in What is a Qualified User? The 1 MW threshold, and you can request a personalized calculation with the free Qualified User validation.
The threshold is not the only filter. The consumption profile determines how attractive your load is to a supplier and, therefore, what price they will offer you:
| Profile variable | Why it matters to the supplier |
|---|---|
| Contracted demand (MW) | Volume: more load, more bargaining power |
| Load factor | Stability: a flat consumption is easier and cheaper to cover |
| Load zone (CENACE) | The local marginal price (LMP) varies by node |
| Seasonality | Sharp peaks make hedging more expensive |
| Horizon at the site | Contracts of 3+ years justify better terms |
A 5 MW plant with a 0.70 load factor and continuous operation will get very different offers than a 1.2 MW industrial park with intermittent load. Buying well starts with knowing your own profile.
The four decisions in buying energy
Every energy purchase via a SuCal comes down to four decisions. Getting any of them wrong, in any order, erodes the savings.
Decision 1 · Who you buy from
Not all suppliers are equal in financial strength, industrial portfolio, service quality, or billing transparency. Choosing poorly exposes the plant to contractual default or to deficient service. The way to safeguard this decision is a competitive, neutral tender: a foreign mining company in Chihuahua with 130,000 MWh per year —a single load center— put more than a dozen Qualified Suppliers in competition under comparable terms and, with a tailored contract and continuous billing audits, achieved savings of more than MX$37 million in a single year (see the Chihuahua mining case). The comparison of the main suppliers in the Mexican market and the criteria to evaluate them are in Comparison: top 5 Qualified Suppliers Mexico 2026.
Decision 2 · Under what contract structure
The bilateral contract defines term, committed volume, indexation, guarantees, and exits. This is where the clauses that cost the most money hide. The eight clauses worth reviewing under a magnifying glass before signing are in 8 dangerous clauses in Qualified Supplier contracts.
Decision 3 · At what price
The price is not a single number: it is the sum of the cost of energy (firm and spot), the capacity charge, and the spread —the supplier's margin—. Understanding and negotiating the spread is what separates real savings from promised savings. We break it down in Negotiating the Qualified Supplier's spread.
Decision 4 · With what risk hedging
How much of your volume goes at a fixed (firm) price and how much remains exposed to spot defines your risk profile. Too much spot exposes you to volatility; too much firm leaves money on the table when the market drops. The optimal hedge depends on management's risk tolerance. In large-scale consumption, this decision becomes a formal discipline of energy risk management in high demand.
Qualified Supplier vs CFE: when each option
Being a Qualified User does not force you to migrate. Some plants that qualify decide to stay in an optimized CFE Basic Supply, and sometimes that is the right call. The point-by-point comparison —price, risk, contract, reliability— is in Qualified Supplier vs CFE Basic Supply.
The executive summary: the MEM via a SuCal makes sense when there is demand above 1 MW, a load factor above 50%, a horizon of 3+ years at the site, and the capacity to manage a contract. CFE makes sense when the load factor is low, the horizon is short, or there is no team to manage the position.
How the price is formed in the MEM
The price of energy in the wholesale market is built on the Local Marginal Price (LMP) that CENACE calculates node by node, hour by hour. The LMP reflects the cost of generating and transmitting energy to your connection point, and it varies with system demand, the price of natural gas, and grid congestion.
A Qualified Supplier offers you, in essence, to transform that hourly volatility into a predictable structure. It does so by combining:
- Firm energy: a block at a fixed or indexed price that protects you from spot peaks.
- Spot energy: the remainder settled at the hourly LMP, which captures market dips but exposes you to spikes.
- Capacity charge: the cost of having capacity available for your peak demand.
- The spread: the supplier's commercial margin for providing the service.
Managing that position —deciding the firm/spot mix, monitoring the LMP, adjusting the hedge— is a continuous discipline, not a one-time formality. It connects directly with energy management in the MEM to optimize costs and with the real source of the savings from the Wholesale Electricity Market.
The conflict of interest no one explains to you
Here is a point most suppliers prefer not to touch: the supplier earns on the spread, not on your savings. Their incentive is to sell you energy at the highest margin you will accept, not to get you the best price in the market. It is not malice; it is the nature of the business.
That is why it is worth separating two roles that often get mixed: who sells you the energy and who advises you on what to buy. When the advisor is the supplier itself, the advice is structurally biased. The figure of independent consulting exists precisely to solve this, and we explain it in The supplier's dilemma: the case for independent consulting.
How it connects with the other energy services
Buying energy is not an isolated decision: it rests on the rest of the plant's energy management system.
- Qualified User and MEM: it is the prior requirement. Without registration with the CRE there is no purchase. See Qualified Users: the complete guide and Qualified User registration with the CRE: step by step.
- Grid Code: technical compliance is a condition to maintain participation in the market. See Grid Code 2026: the complete guide.
- Energy management: reliable data (metering) and KPIs are what tell you whether your supplier is honoring the contract. See Industrial Energy Management: the complete guide.
- Optimization: correcting power factor and managing demand improves your load profile and, with it, the price you are offered. See Industrial energy optimization: a practical guide.
- Sustainability and CELs: a contract with a renewable mix can allocate you Clean Energy Certificates (CELs), useful for your ESG goals. See CELs, RECs and ESG in Mexico 2026 and the home appliance case in Saltillo that met its ESG requirement with CELs.
The roadmap of a well-executed energy purchase
An orderly process, from decision to signature, usually looks like this:
- Month 0 · Eligibility validation. Confirm the 1 MW threshold and the load profile with the real bill.
- Month 1 · Registration as a Qualified User. File for the status with the CRE if you do not already have it.
- Month 1-2 · Profile characterization. Build the hourly load curve, load factor, and seasonality with 12 months of data.
- Month 2 · Request for quotes (RFQ). Ask several suppliers to quote against the same profile so they are comparable.
- Month 2-3 · Evaluation and short list. Compare price, spread, structure, guarantees, and financial strength. See supplier comparison.
- Month 3 · Contract negotiation. Review the dangerous clauses and negotiate the spread.
- Month 3-4 · Signature and transition. Coordinate the change of supplier without service interruption.
- Ongoing · Position management. Monitor the LMP, contract compliance, and report the savings to management.
The typical total time, from validation to the first bill from the new supplier, is three to six months, depending on whether the Qualified User status already exists. The full timelines are in Migration to the MEM: timelines, risks and planning.
How much it costs and how much you recover
The figures are indicative for a 2-5 MW plant; the real case depends on consumption, load zone, and profile:
| Item | Indicative range (MXN) |
|---|---|
| Registration as a Qualified User with the CRE | $150,000 – $400,000 (one-time) |
| Financial guarantees to the supplier | Variable; letter of credit or deposit |
| Independent advisory fees | Per the scope of the 360 Plan |
| Typical gross savings vs CFE baseline | 15% – 30% of electricity spend |
For a plant with annual electricity spend of $20 million MXN, savings of 18% represent $3.6 million a year. The cost of registration and advisory is recovered, in most cases, within the first months of the contract.
Common mistakes when buying energy via a SuCal
- Comparing offers with different profiles. If each supplier quotes with different assumptions, the prices are not comparable. The same profile must be given to all of them.
- Looking only at the first-year price. A low teaser price with aggressive indexation can end up costing more in year two. The full contract must be modeled.
- Ignoring take-or-pay clauses. If production drops and the contract forces you to pay for unconsumed volume, the savings evaporate.
- Not verifying the supplier's financial strength. A default forces an emergency transition that is costly and disruptive.
- Letting the supplier also be the advisor. The conflict of interest biases the recommendation toward the largest spread.
- Signing without a Grid Code plan. The CRE may condition participation on technical compliance.
Related guides
- How to read a CFE feasibility letter: the feasibility letter resolves the physical connection to the grid before it matters who you buy the kWh from.
Next step
Buying energy via a Qualified Supplier is the difference between enduring the tariff and managing a commercial position. But doing it well requires a characterized load profile, comparable offers, a negotiated contract, and an advisor with no conflict of interest.
At Enerlogix we run the whole thing within the 360 Management Plan: we validate your eligibility, characterize your load, launch the RFQ to several suppliers, compare real offers, negotiate the contract and the spread, and then manage the position and report the savings to you. As an independent advisor, our incentive is your best price, not our margin.
Request a free evaluation of the 360 Management Plan or learn about the energy purchasing service. We work with your real bill, not with generic scenarios.
Frequently asked questions
First, to be a Qualified User, which requires an annual average demand equal to or greater than 1 MW per load point, or aggregated across plants of the group under the rules in force, plus registration with the CRE. With that status you can already contract a Qualified Supplier through a negotiated bilateral contract. In parallel, the CRE verifies Grid Code compliance as a condition to authorize and maintain your participation in the market.
Typical gross savings range from 15% to 30% over the CFE Basic Supply baseline, and are higher in plants with a high load factor, above 50%, and continuous operation. For a plant with annual electricity spend of 20 million pesos, savings of 18% represent close to 3.6 million a year. It is worth modeling the full contract over 24 or 36 months with your real bill, not just the first-year price.
The spread is the commercial margin the supplier charges to give you access to the market and manage your position. It is part of the total price along with the cost of firm and spot energy and the capacity charge. Negotiating the spread is what separates real savings from promised savings, because the supplier earns on that margin, not on your savings. That is why it is worth comparing offers and, when possible, relying on an independent advisor.
No. The electrical grid is still operated by CFE Transmission and CFE Distribution, and CENACE coordinates the system regardless of who bills the energy. Technical reliability, outages, and interruptions do not change. Only who sells you the energy, and under what contractual terms, changes. In addition, if the supplier defaults, there is a supplier of last resort that prevents you from being left without service.
Three to six months from validation to the first bill from the new supplier, depending on whether you already hold Qualified User status. The process includes registration with the CRE, characterization of the load profile, a request for quotes from several suppliers, evaluation, contract negotiation, and the coordinated transition of service without interruption.
It is not ideal. The supplier earns on the spread, so its incentive is to sell you energy at the highest margin you will accept, not to get you the best price in the market. It is a structural conflict of interest. It is better to separate who sells you the energy from who advises you on what to buy, relying on independent consulting that represents your interests in the negotiation.
