A food plant director pays two energy bills in parallel: the electricity bill from CENACE or their supplier, and the natural gas bill from what they burn in boilers to produce steam, cooking, and hot water. Cogeneration proposes merging those two accounts into a single system and, along the way, cutting the total cost. But it is not for every plant. It pays off when there is a very specific profile, and it is an expensive mistake to install it without one.
This article explains what natural gas cogeneration is, how it works, when it does and does not pay off in the food industry, the costs and typical payback, and what the CRE-recognized efficient cogeneration designation adds. The question that decides everything is simple: does your plant have thermal and electrical demand at the same time, most of the year?
What is natural gas cogeneration?
Cogeneration produces electricity and useful heat simultaneously from a single fuel, almost always natural gas. Instead of buying electricity from the grid and burning gas separately in boilers, an engine or gas turbine generates the electricity, and the residual heat from that same equipment is used to produce process steam or hot water.
The result is a far greater use of the fuel. A conventional thermoelectric plant uses only 35% to 40% of the energy in the fuel, while a cogeneration system reaches total efficiencies of up to nearly 80%, according to INEEL. The difference is the heat that normally goes up the chimney and that here is reused.
Why the food industry is the textbook case
The typical food plant needs both forms of energy at once and continuously. Steam for cooking, blanching, pasteurization, and CIP cleaning. Sanitary hot water. And electricity without pause for refrigeration, motors, pumps, and lines. That simultaneous and constant thermal-electric profile is exactly where cogeneration performs best, because all the heat it produces is consumed in the process instead of being wasted. It is the same underlying logic as all good energy management in the food industry: first understand the consumption profile, then decide the technology.
When does cogeneration pay off and when does it not?
Cogeneration is not justified by having a high electricity bill. It is justified by the profile of simultaneous thermal and electrical demand. If a plant has a lot of electrical demand but little thermal demand, the heat produced has nowhere to go and efficiency collapses. The following table summarizes the criterion by profile.
| Plant profile | Does cogeneration pay off? | Why |
|---|---|---|
| High and continuous thermal and electrical demand, many hours a year | Yes, ideal case | All the heat is used; maximum efficiency and shortest payback |
| Lots of thermal demand, moderate electrical demand | Probably yes | Heat is the engine of the saving; sizing is evaluated |
| Lots of electrical demand, little or no thermal demand | Almost never | The surplus heat is wasted; better to evaluate solar or another route |
| Intermittent or seasonal operation, few hours a year | Hard to justify | Without operating hours the investment is not recovered |
| Low demand on both fronts | No | The investment finds no scale to pay for itself |
The factor that most moves the result, after the profile, is the operating hours per year. A food plant that runs 6,000 to 8,000 hours a year is very different from one that operates seasonally. The more hours with both demands present, the faster the system pays for itself.
The key question before investing
Before requesting a single quote, answer this: does your plant consume heat (steam or hot water) and electricity at the same time, for most of the year? If the answer is yes, cogeneration deserves a serious study. If it is no, almost any other energy optimization measure will give you a better return before cogeneration.
How much does it cost and how long until it pays off?
The payback depends on three variables: the size of the system, the operating hours, and the differential between the price of natural gas and that of the electricity you stop buying. When gas is cheap against the electricity tariff, the financial case improves.
The price of industrial natural gas in Mexico is referenced to the U.S. Henry Hub plus transport and exchange rate. For 2026 the references stand in an approximate range of ~3.5 to ~4.5 USD/MMBtu, according to market forecasts, still a historically low level. The following table shows typical ranges, not a quote; each plant is modeled with its real bill.
| Variable | Approximate range | Note |
|---|---|---|
| Industrial natural gas MX (2026) | ~3.5 to ~4.5 USD/MMBtu | Referenced to Henry Hub + transport + FX |
| Total system efficiency | ~75% to ~85% | Vs. ~50% to ~55% for separate generation |
| Typical reduction in energy cost | ~15% to ~30% | Depends on the profile and the operating hours |
| Typical payback | ~3 to ~7 years | Ideal cases drop below 3 years; intermittent ones do not apply |
In well-sized projects, with a continuous thermal-electric profile, the return usually falls in an approximate range of 3 to 7 years, and the optimal cases —many hours, competitive gas, high self-consumption— can be recovered in under three years. A system poorly sized for the real profile may never pay for itself, which is why the prior study is not optional.
The role of CRE-recognized efficient cogeneration
In Mexico, a cogeneration system can be accredited as efficient cogeneration if it exceeds the thresholds defined by the CRE methodology. That accreditation matters because it turns part of the energy generated into clean energy for regulatory purposes, with concrete benefits.
According to Cogenera México, efficient cogeneration opens access to Clean Energy Certificates (CELs), allows anticipating and planning the cost of energy over the long term, and grants recognition of self-supply capacity during demand hours. For a food plant, this translates into a more predictable bill and, depending on the case, into an ESG asset that carries weight with clients and export chains.
We don't invent requirements: eligibility and the exact percentages are determined by the CRE case by case, and it pays to validate them before basing the financial model on that benefit. It is part of the work of the energy audit and the project design.
Cogeneration versus other routes
Cogeneration does not compete alone. A food plant can combine solar self-supply for the daytime electrical portion and cogeneration for the continuous thermal-electric base. The choice depends on the profile. If you are unsure between routes, it is worth reading when industrial solar energy pays off and the comparison between distributed and central generation, because each load profile has a different winner.
The practical rule: cogeneration wins when heat is the protagonist and continuous. Where heat is in surplus, another technology performs better.
How Enerlogix evaluates your case
At Enerlogix we start from your real electricity and gas bills, and from your hourly thermal and electrical load profile. With that we model whether cogeneration pays off, what size makes sense, what payback to expect, and whether you qualify as efficient cogeneration before the CRE. If it doesn't pay off, we tell you: our incentive is not to sell you equipment, but your best energy decision.
It is the approach of the Plan 360 Management: measure first, recommend after, and always prioritize by return. Cogeneration is one more piece within the energy optimization of your plant, not an end in itself.
Request a free evaluation and we work with your real bills to see if your thermal-electric profile justifies cogeneration.
Frequently asked questions
It pays off when the plant has thermal demand (steam, cooking, hot water) and electrical demand at the same time, continuously and many hours a year. That simultaneous profile makes it possible to use all the heat of the system instead of wasting it. If there is a lot of electrical demand but little thermal demand, or the operation is seasonal, it is almost never justified against other measures.
A conventional plant uses only 35 to 40 percent of the energy in the fuel, while a cogeneration system reaches total efficiencies of up to nearly 80 percent by using electricity and heat in a single process. In practice the systems operate in an approximate range of 75 to 85 percent total utilization, against around 50 to 55 percent for separate generation.
The typical payback falls in an approximate range of 3 to 7 years, and the optimal cases with many operating hours, competitive gas, and high self-consumption can be recovered in under three years. It depends on the size of the system, the operating hours, and the differential between the price of natural gas and the electricity tariff. A poorly sized system may never pay for itself.
It is a cogeneration system that exceeds the thresholds of the CRE methodology and is accredited as such. That accreditation turns part of the energy into clean energy for regulatory purposes, which gives access to Clean Energy Certificates or CELs, allows anticipating the cost of energy, and grants recognition of capacity. The exact percentages are determined by the CRE case by case.
Industrial natural gas in Mexico is referenced to the U.S. Henry Hub plus transport and exchange rate. For 2026 the references stand in an approximate range of 3.5 to 4.5 dollars per MMBtu according to market forecasts, still a historically low level. The real price of each plant depends on its contract, its location, and its volume, which is why the case is modeled with the real bill.
