If your industrial plant has a load center connected to the national electric grid and moves more than 500 kVA, you are already within the scope of the Grid Code. The good news: complying is not optional, but it's not impossible either. The bad news: the CRE escalated penalties over the last two years, and companies that assumed "I'll deal with it later" are facing fines of millions of pesos in 2025–2026.
This guide is for Energy, Operations, and Maintenance Directors who need to understand what the Grid Code requires in 2026, what technical studies the authority demands, what happens if you don't comply, and what the realistic plan is to reach full compliance without stalling your operation.
What is the Grid Code?
The Grid Code is the mandatory technical regulation issued by the Energy Regulatory Commission (CRE) to ensure that the National Electric System (SEN) operates safely, reliably, and efficiently. In practice, it defines the technical conditions that every participant connected to the grid — generators, transmitters, distributors, and large industrial consumers — must meet so as not to destabilize the system.
The Grid Code is not a recommendation. It is a regulatory instrument published in the Official Gazette of the Federation with the force of law. Non-compliance is sanctioned with administrative fines that the CRE has increased significantly since the 2025 Reform.
Who does it apply to?
The Grid Code applies to your company if your load center meets any of these conditions:
- Contracted demand equal to or greater than 500 kVA
- Connection at medium or high voltage (typically 13.8 kV, 23 kV, 34.5 kV, 69 kV, 115 kV or more)
- Electrical equipment with the potential to impact the power quality of the SEN (large motors, arc furnaces, industrial welders, massive variable frequency drives)
If you're unsure whether it applies, the practical rule is: if your CFE bill shows contracted demand in kVA and not in kWh, you are almost certainly within scope.
The 5 main obligations of the Grid Code
Broadly, the Grid Code obligations group into 5 blocks that cover the entire operational life cycle of the load center.
1. Electrical studies prior to interconnection or expansion
Before connecting a new center or expanding an existing one, you must submit technical studies to the CRE that demonstrate your installation does not harm the grid. The main ones are:
- Short-circuit study: how much current can flow in the event of a fault
- Load-flow study: how the grid behaves under different demand scenarios
- Protection-coordination study: how the breakers respond to faults
- Power-quality study: harmonics, flicker, imbalances
These studies are signed by an electrical installations expert certified by the CRE. Read the detail in Grid Code electrical studies: which ones, when, costs.
2. Operational protection coordination
Submitting the study just once is not enough. The protections must be coordinated in continuous operation and readjusted every time the installation is modified: new load, new line, new substation. We go deeper in protection coordination under the Grid Code.
3. Power quality
Your installation cannot inject harmonics, flicker, sags, or imbalances that affect the quality of the SEN beyond the limits the Code defines. This is measured with permanent monitoring equipment (power-quality analyzers) and reported to the CRE in specific windows. See industrial power quality: harmonics, flicker, sags.
4. Periodic technical reports
The CRE requires annual technical reports (some semiannual) on operational performance, faults, unscheduled outages, unavailability, and maintenance. Companies that don't report on time and in form receive observations that escalate to penalties.
5. Documented preventive maintenance
Every critical piece of equipment (main transformers, power breakers, protection systems) must have a documented maintenance program and traceability of the electrical tests performed. If the CRE audits you and you have no evidence, it's an immediate observation. We leave you a preventive substation maintenance checklist by periodicity to organize what to test each month, quarter, and year.
Quick win: many plants have the maintenance done but not documented. The first step toward compliance is organizing the existing paperwork — frequently it's 70% ready and no one has sat down to put it together.
CRE penalties in 2024–2026
Here the conversation gets serious. The CRE increased penalty amounts and frequency starting in 2024. The typical ranges we are seeing:
| Type of non-compliance | Typical penalty (MXN) |
|---|---|
| Lack of basic electrical studies | $500,000 – $3,000,000 |
| Deficient protection coordination | $300,000 – $2,000,000 |
| Power quality outside limits | $200,000 – $1,500,000 |
| Technical reports not submitted | $150,000 – $800,000 |
| Recurrence or aggravating factor (operational fault) | Up to $10,000,000+ |
In 2025, an automotive plant in the Bajío received a penalty of $4.7 million MXN for not having submitted the protection-coordination study when it expanded its substation. The accumulated penalty for systemic non-compliance can paralyze future investments because the CRE can deny new interconnection permits until the open observations are resolved. Full detail in CRE penalties for Grid Code non-compliance.
The realistic compliance plan: 18 months
If your company is today in a low-compliance situation, it won't be solved in a week. But it isn't endless either. The typical timeline Enerlogix executes to take a mid-sized industrial plant from "no studies" to "full compliance" takes between 12 and 18 months, divided into 4 phases:
Phase 1 · Diagnosis (month 1–2)
Documentary and technical audit. What studies exist? How outdated are they? What is the gap with what the CRE requires?
Phase 2 · Critical studies (month 3–8)
The missing electrical studies are executed in priority order: first short-circuit and coordination, then load flow, then power quality with real measurements.
Phase 3 · Implementation of corrective measures (month 9–14)
If the studies reveal non-conformities (poorly coordinated protections, deficient capacitor bank, harmonics out of standard), corrective works are executed: relay replacement, transformer adjustment, filter installation.
Phase 4 · Steady state (month 15–18)
Everything is documented, the complete file is delivered to the CRE, and the processes for continuous monitoring and periodic reporting are established. The plant reaches stable compliance.
For detail by industry, read Grid Code compliance plan: 18-month timeline.
How much does Grid Code compliance cost?
This is the CFOs' question. The typical ranges for a 2–5 MW demand plant:
| Item | Range (MXN) |
|---|---|
| Complete electrical studies | $400,000 – $1,200,000 |
| Power-quality monitoring equipment | $250,000 – $800,000 |
| Corrective upgrades (filters, capacitors, relays) | $500,000 – $4,000,000 |
| Ongoing regulatory advisory | $180,000 – $480,000 / year |
| Documented maintenance and electrical testing | $200,000 – $700,000 / year |
Estimated first-year total: $1.5M – $7M MXN depending on size and starting point. Recurring operation: $400K – $1.2M MXN per year.
Compared with a typical penalty of $2M–$5M for non-compliance, complying costs less than not complying over horizons of 24 months or more. And the costs don't include the operational risk: a fault from poorly coordinated protection can cause a plant shutdown of 4–48 hours, which in continuous-production industry represents between $500,000 and several million pesos in losses.
Industries with the greatest exposure
Not all industries face the same level of demand. The ones the CRE audits most frequently in 2026:
- Automotive — stamping, paint, and welding lines introduce measurable disturbances. See case: Grid Code compliance at a Saltillo automotive plant.
- Steel, foundry, and metallurgy — arc furnaces are the largest generators of harmonics and flicker in the industrial sector.
- Cement and mining — large rotating equipment, mills, high-voltage pumping.
- Chemicals and petrochemicals — processes with high interdependence between electricity supply and safety.
- Electronics manufacturing — cleanrooms with critical HVAC and UPS, sensitive to power quality.
If you're in any of these sectors, your compliance priority is high regardless of size.
The connection with migration to the MEM
If you're evaluating migration to the Wholesale Electricity Market as a Qualified User, the Grid Code becomes doubly critical: the CRE verifies compliance as a condition for authorizing the migration. Companies that register as a QU without having the Grid Code resolved face mandatory deadlines to come into compliance, which makes the migration more expensive and delays the capture of savings.
The best practice: resolve the Grid Code in parallel with migration to the MEM, not afterward. It is one of the pillars of Plan 360 Management.
Need help? How Enerlogix supports you
At Enerlogix Solutions we have taken more than 50 industrial companies to stable Grid Code compliance, integrated within the Plan 360 Management. Learn about our Grid Code compliance service, which covers the 4 phases of the typical timeline:
- Diagnosis — documentary and technical audit, no obligation
- Studies — executed by certified experts, deliverables accepted by the CRE
- Implementation — we coordinate the corrective works with your maintenance team
- Steady state — we establish the continuous cycle of reporting and monitoring
If your plant has open observations with the CRE, or you want to understand concretely what your compliance situation is, request a free Plan 360 Management evaluation. We review your current documentation, identify gaps, and deliver a roadmap at no obligation.
Frequently asked questions
It applies if your load center has contracted demand equal to or greater than 500 kVA, a connection at medium or high voltage (from 13.8 kV to 115 kV or more), or equipment with the potential to impact the system's power quality, such as large motors, arc furnaces, or massive drives. Practical rule: if your CFE bill shows demand in kVA and not in kWh, you are almost certainly within scope.
The CRE escalated amounts starting in 2024. The lack of basic electrical studies ranges from 500,000 to 3 million MXN; deficient protection coordination from 300,000 to 2 million; power quality outside limits from 200,000 to 1.5 million; and unsubmitted reports from 150,000 to 800,000. Recurrence or an operational fault can exceed 10 million. In 2025 an automotive plant in the Bajio received 4.7 million for this item.
For a 2-to-5 MW plant, the first year ranges from 1.5 to 7 million MXN depending on size and starting point; recurring operation falls between 400,000 and 1.2 million per year. Compared with a typical penalty of 2 to 5 million, complying costs less than not complying over horizons of 24 months or more, not counting the risk of a plant shutdown from poorly coordinated protection.
The typical timeline Enerlogix executes to take a mid-sized plant from no studies to full compliance takes between 12 and 18 months, in four phases: documentary and technical diagnosis (month 1 to 2), critical electrical studies (month 3 to 8), implementation of corrective measures (month 9 to 14), and steady state with delivery of the file to the CRE and continuous monitoring (month 15 to 18).
The CRE verifies Grid Code compliance as a condition for authorizing migration to the MEM as a Qualified User. Companies that register without having it resolved face mandatory deadlines to come into compliance, which makes the migration more expensive and delays the savings. The best practice is to resolve the Grid Code in parallel with the migration, not afterward.
