Monitoring does not lower consumption, and that is the point
A plant manager in Mexico looking at a CFE bill is looking at two different quantities that are usually discussed as if they were one. The energy charge bills kWh consumed over the month. The demand charge bills kW at the highest interval the meter recorded, and on a time-of-use tariff the period in which that interval fell changes what it costs. Software that watches meters does not reduce either one. It tells you which of the two is driving your bill, and which equipment and which hour is responsible.
That distinction is worth stating plainly because energy monitoring is sold as though installing it lowers consumption. It does not. Consumption falls when someone changes an operating decision, reschedules a load, fixes a leak or replaces a machine. Monitoring shortens the gap between a waste event and the decision to stop it, and it supplies the evidence that a change worked. Cost and waste come down. Consumption comes down only where a decision follows the data.
For a facility director building a business case, that framing decides what the platform has to be able to do. If the problem is consumption, you need consumption by system over time. If the problem is demand, you need interval data at the meter and enough sub-metering to attribute the peak. Those are different specifications, and buying the wrong one is the most common failure in this category.
Which line of the bill you are actually attacking
Industrial and large commercial sites in Mexico are billed under CRE-approved tariff classes. A site on medium-tension supply with demand of 100 kW or more sits on GDMTH, the time-of-use class with base, intermedio and punta periods. Below 100 kW on the same voltage band the class is GDMTO, a flat rate with no time differentiation. Loads taken at subtransmission voltage sit on DIST, and loads taken at transmission voltage sit on DIT.
Which class a site sits on determines what monitoring can win. On GDMTO there is no punta window, so shifting a load through the day changes nothing and the whole gain has to come from consuming less. On GDMTH, DIST and DIT the same kWh costs different amounts depending on when it is drawn, and a peak set during punta is expensive in a way the monthly kWh total will never reveal. A site that cannot see its own load in intervals cannot tell those two situations apart.
Demand in the Mexican system is measured as maximum recorded demand in kW, typically in 15-minute intervals, the same basis SENER used in its acuerdo published in the Diario Oficial de la Federación on 1 March 2017 to define demand for Usuario Calificado purposes. Fifteen minutes is the resolution that matters. A monthly reading cannot show a peak. An hourly average can hide one.
The thresholds interval data tells you whether you have crossed
Two Mexican thresholds turn on numbers that most sites do not measure precisely, and both are commercial decisions rather than technical ones.
- Usuario Calificado status requires 1 MW of demand, not annual consumption, under the schedule in the Ley de la Industria Eléctrica and the SENER acuerdo published in the DOF on 1 March 2017. Demand for high and medium tension users with recent service is the maximum demand in kW recorded over the preceding 12 months. A site near that line needs to know where it actually sits before it can evaluate migrating to a Suministrador de Servicios Calificados.
- Direct market participation as a Usuario Calificado Participante del Mercado is a higher bar: minimum demand of 5 MW and annual consumption of at least 20 GWh, per CRE's guidance on the Registro de Usuarios Calificados. Note that this one is the source of the annual consumption figure that gets misquoted as the Usuario Calificado threshold.
- CONUEE reporting applies to sites above 45 GWh of annual electricity consumption, or above 100,000 barrels of crude oil equivalent in fuel, under the administrative provisions published in the DOF on 15 November 2018. Those users report their consumption and their energy conservation measures to CONUEE annually, and a monitoring platform that already holds the data turns that filing from a project into an export. The wider framework these thresholds sit inside is covered in the overview of Mexico's energy efficiency market for industrial buyers.
A multi-site group in Mexico frequently discovers, once it has interval data, that one plant is above the Usuario Calificado threshold and the rest are not, which changes the procurement strategy for the whole portfolio.
What the platform needs to do
Real-time monitoring through sensors on production equipment shows where energy is being wasted while the waste is still happening, rather than after a bill arrives. Reporting by month and by system separates a process problem from a building problem. Recording building modifications and their dates keeps a like-for-like comparison possible across years and gives a replacement decision something to stand on.
Remote access removes the site visit. Instead of walking to physical meters at outlying locations, a user reads temperature, electricity, humidity, moisture and gas from one place, which matters most for sites with several buildings or several plants and for readings that feed product compliance records. Bringing in local temperature data alongside consumption is what separates a heating and cooling problem, or an insulation problem, from an equipment problem.
On the financial side, the platform applies published energy prices and user-assigned values so the cost of energy used is visible without waiting for an invoice, carries an invoice management function for the accounting team, and analyzes realized savings against projected savings and cash flow. Where a savings figure appears anywhere in that output, treat it as illustrative. Savings measured against current CFE supply vary with tariff class, region, load factor and consumption profile, and no range is confirmed for a site until 12 months of billing and interval data have been reviewed.
Access and permissions decide whether the platform survives contact with a real organization. Our software supports an unlimited number of user profiles with different privilege levels, so an office building owner can give each tenant its own consumption data without exposing the rest of the building. The interface runs in a browser on a tablet or a phone in the field, which removes the older pattern of returning to a desktop to see a reading. Separation of duties between a facilities team, a finance team and a tenant is a requirement in most multi-tenant and multi-site deployments, not a nice-to-have.
The specification a monitoring platform has to meet
- The tariff class on the current bill, and the split between the energy charge and the demand charge over the last 12 months. That split tells you what the platform has to measure.
- Whether the platform records interval data at 15 minutes or coarser, and whether it retains raw intervals or only aggregates.
- How many sub-meters the deployment includes, and whether they are placed on the equipment that plausibly sets the peak rather than only at the service entrance.
- Whether the reporting output maps to the CONUEE data fields, if the site is above the reporting thresholds.
- Who is accountable for acting on an alert. A platform without a named owner and a response procedure produces dashboards, not savings.
Monitoring pairs with the physical work rather than replacing it. For the measures a facility team can run itself, see shutdown and restart practices that reduce load at a facility, and for the programs and financing behind equipment replacement, see Mexico's energy efficiency programs and financing routes.
Review what your interval data is telling you
Mexico Energy Partners reviews a facility's tariff class, interval data and billing history to establish how much of the bill is consumption, how much is demand, and where sub-metering would pay for itself. An initial review needs 12 months of CFE billing, the tariff class, a load list and any interval data the meter already produces. See how our energy monitoring work is structured.