Most Wholesale Electricity Market (MEM) migrations that end badly do not fail from a single catastrophic decision. They fail from an accumulation of small omissions made in good faith, at different moments, by different people. The dossier slips, the contract has gaps, the guarantees surprise finance, and 14 months later real savings are half of what was promised.
After supporting dozens of Mexican industries through their Qualified User registration and subsequent MEM operation, error patterns repeat with notable frequency. This article lists the 10 costliest, describes how they show up in practice, and delivers an actionable recommendation for each. It is not a theoretical list: it's what we see when companies arrive asking us to "rescue" a contract signed two years ago.
1. Underestimating technical due diligence
The mistake. Starting the process based on the "contracted demand" in the CFE contract, without reconstructing the actual hourly load profile of the last 12 months. The company signs based on nominal data; in real operation, peaks, valleys, and peak hours don't look like the initial deck.
Typical cost. Savings overestimation of 8–15 percentage points and the need to renegotiate at month 12.
Recommendation. Reconstruct the 8,760-hour profile with real meter data before signing any RFP, and model the contract on that verified profile.
2. Starting without a complete hourly load profile
The mistake. Making the decision with monthly aggregated data —"850,000 kWh/month consumption and 1.5 MW contracted demand"— without dropping to hourly granularity. MEM price structure rewards or punishes based on which hours you consume; monthly averages mislead.
Typical cost. Contracts calibrated to a profile that isn't the real one, with premiums for high-priced-hour exposure.
Recommendation. Request CFE's smart-meter interval data (15-minute) or reconstruct from plant data (SCADA, operational logs). The effort pays off in the first contract quarter.
3. Choosing supplier solely on price
The mistake. Comparing 3 quotes by price column and signing the cheapest without reviewing captive generation, compliance history, spot exposure, or guarantee structure. The cheapest supplier is usually so because they resell market-exposed energy, or they have clauses the more expensive competitor does not.
Typical cost. Price instability in year two, frequent technical disputes, or in extreme scenarios, forced transfer to the supplier of last resort.
Recommendation. Multi-criteria evaluation matrix (price, captive generation vs resale, CRE compliance history, renewable mix, exit clauses, guarantees). For a useful structural comparison, see Qualified Supplier vs CFE Basic Supply.
4. Not reviewing exit clauses
The mistake. Signing 5-year contracts without reading early-termination penalties. Sounds extreme, but it happens often: the conversation focuses on the kWh price, not on what happens if your operation changes.
Typical cost. Penalties of 6–18 months of billed consumption to exit the contract when operations pivot or a plant closes.
Recommendation. Specific legal review of exit clauses before signing. Negotiate decreasing penalties over time and allow penalty-free exit for documented structural changes (plant closure, M&A, industrial force majeure).
5. Underestimating required financial guarantees
The mistake. Assuming the guarantees required by supplier and CENACE are nominal. In reality they can represent 1 to 3 months of billed consumption in letters of credit or deposits —tying up bank lines or working capital—.
Typical cost. Surprise in finance during phase 2 of the project, contract signing delay, or accepting a more expensive guarantee structure to avoid losing time.
Recommendation. Model financial guarantees from the business case phase, not at signing. Understand the impact on bank lines and plan with treasury.
6. Ignoring Grid Code (Código de Red) compliance
The mistake. Starting migration without an audit of Grid Code (Código de Red) compliance: power factor, harmonic distortion, voltage regulation, protection systems. The Grid Code is mandatory for MEM participants and the CRE can sanction non-compliance.
Typical cost. Administrative fines, recurring observations, post-signing remediation costs ranging from MXN 500,000 to several million depending on the plant.
Recommendation. Grid Code audit in phase 1 of the project. If there is non-compliance, plan investments before the supplier or CENACE flag them.
7. Not aligning the contract with operational expansion
The mistake. Signing for 1.5 MW when the industrial plan contemplates expansion to 2.3 MW within 24 months. The MEM contract doesn't auto-scale; additional energy may fall outside the negotiated contract, exposed to CFE tariff or to renegotiation from a weaker position.
Typical cost. Dual payment (MEM contract + Basic Supply for the increment) or renegotiation under pressure with worse structure.
Recommendation. Align the contract with the strategic industrial plan. Negotiate upward flexibility bands (30–50% above base commitment) and incorporation mechanisms for new loads.
8. Trusting savings estimates without monthly audit
The mistake. Assuming that the supplier's monthly invoice reflects modeled savings, without auditing it against the CENACE settlement. Information asymmetry favors the supplier, and minor errors —which compound— go undetected without process.
Typical cost. 1–4 percentage points of savings lost to undetected billing, calibration, or charge-application errors.
Recommendation. Monthly audit process with a designated internal owner. Compare CENACE settlement, supplier invoice, and projected model. Report monthly to finance. To understand real savings mechanics, see How much do you really save as a Qualified User?.
9. Skipping stages to accelerate
The mistake. Pushing the CRE, the supplier, and CENACE to "go faster" without completing technical verification, documentary file, or testing. The consequence isn't moving faster: it's returning to prior stages with observations that cost weeks.
Typical cost. A project that looked like 4 months ends at 8, with recurring CRE observations and added legal costs.
Recommendation. Accept that phase 1 (analysis and decision) is the project's most valuable, not the most expendable. See Migrating to the MEM as a Qualified User: timelines, risks and implementation plan.
10. Not designating an internal project owner
The mistake. Treating migration as shared responsibility across operations, finance, legal, and maintenance, without an owner empowered to resolve conflicts. The dossier moves in turns, decisions are deferred, and the project loses momentum every time it shifts desks.
Typical cost. Project duration extended 50–100%, technical decisions taken late and with incomplete information, opportunity cost from additional months in CFE Basic Supply.
Recommendation. Formal owner designation with clear KPIs, deliverable calendar, and executive sponsorship. The owner doesn't need to be the most senior; they need allocated time, authority, and direct access to senior management.
The pattern behind the 10 mistakes
Most share an origin: treating MEM migration as a procedure when it's actually a transformation project. Procedures are delegated; projects are managed. The difference is quantifiable in results.
For the full picture of the regime, see the Complete Guide to Qualified Users. To understand the step-by-step process, review Qualified User Registration with the CRE.
How Enerlogix helps you avoid these mistakes
Enerlogix Solutions' Plan 360 Management is designed precisely on the learning from these 10 mistakes. Every project phase includes explicit checks, evaluation matrices, legal and financial review, and a monthly audit process during operation.
If your company is considering MEM migration and wants an honest diagnostic of the specific risks in your case, request a free evaluation. We review your situation, tell you which mistakes are most likely in your context, and design a plan to avoid them.
