The savings from a Qualified Supplier contract are not won in the price shown on the cover of the offer. They are won —or lost— in the fine print of the bilateral contract. An attractive price tied to poorly negotiated clauses can end up costing more than staying with CFE Basic Supply. And the worst part is that the cost is invisible at signing: it appears eighteen months later, when production drops, the market moves, or you want to leave.
The reverse is also true: a well-structured contract, matched to the company's profile and risk appetite, is where the real savings appear. A Bajío company with three Load Centers and 82,000 MWh per year proved it with a tailored energy and capacity block scheme that delivered MX$72 million in savings in 2024 (see the Multipunto Bajío case).
This article walks through the eight clauses that cost the most money in a qualified supply contract in Mexico, the risk each one introduces, and how to renegotiate it before signing. It is not a substitute for legal and energy advice, but it is the checklist every CFO and Energy director should have on the table before signing.
If you are still choosing a supplier, first read the comparison of the main suppliers. If you already have the offer and are about to negotiate, this is your guide.
1 · Take-or-pay (mandatory minimum volume)
The risk. It obligates you to pay for a minimum volume of energy even if you do not consume it. If your production drops —a technical shutdown, a recession, seasonality— you pay for energy you did not use. It is the clause that generates the most surprises.
How to renegotiate. Ask for a tolerance band (for example, take-or-pay only below 80% of the contracted volume) and tie the minimum to a real historical average, not to your peak. If your operation is cyclical, demand seasonal flexibility.
2 · Opaque indexation formula
The risk. The "fixed" price rarely is: it is indexed to natural gas (Henry Hub), the USD/MXN exchange rate, or inflation. If the formula is opaque or indexed to an index you do not control, the year-two price can be very different from the year-one teaser.
How to renegotiate. Demand the complete formula in writing, with the exact index, the cut-off date, and the adjustment factor. Model the contract over 24-36 months with scenarios for each index. A low price with aggressive indexation is usually more expensive than a high one with contained indexation.
3 · Early-exit penalty
The risk. A disproportionate penalty chains you to the supplier even if its service worsens or a better offer appears. Some contracts calculate the exit as the present value of all the remaining margin: leaving costs almost as much as fulfilling the contract.
How to renegotiate. Cap the penalty at a reasonable amount that decreases over time. Negotiate grounds for exit without penalty: SLA breach, recurring billing errors, service degradation.
4 · Excessive financial guarantees
The risk. The supplier demands letters of credit, surety bonds, or deposits that tie up working capital. An oversized guarantee is a hidden financial cost that is rarely quantified when comparing offers.
How to renegotiate. Adjust the guarantee to the real risk (your payment history, your strength) and negotiate its progressive reduction as you demonstrate compliance. Compare the financial cost of the guarantee across suppliers: it is part of the total price.
5 · Automatic renewal (tacit renewal)
The risk. The contract renews on its own unless you give notice within a certain window, often on less favorable terms. You lose the window to renegotiate or switch suppliers without realizing it.
How to renegotiate. Eliminate automatic renewal or turn the notice into an obligation of the supplier (to notify you 90 days in advance). Schedule the contract review date internally as a milestone, not as a formality.
6 · Unilateral change-in-law clause
The risk. It allows the supplier to pass on to you any cost arising from regulatory changes —and Mexico changes its energy framework frequently—. Without limits, this clause turns regulatory risk into your exclusive problem.
How to renegotiate. Narrow which changes apply (only those that directly affect the cost of energy, not any administrative adjustment), demand documented evidence of the impact, and negotiate a cap or a sharing of the risk. The 2025 vs 2026 Energy Reform shows why this clause matters so much in Mexico.
7 · Price definition with uncapped pass-through
The risk. Market costs —CENACE ancillary services, capacity charges, losses— are passed on to you with no cap and no transparency. The "competitive price" inflates with items you did not see when comparing.
How to renegotiate. Demand the closed list of items that are passed through and which ones the supplier absorbs. Ask for caps on the variable pass-throughs. This is where the breakdown of the spread becomes critical: what is not in the spread is usually hidden in the pass-throughs.
8 · Total exclusivity over the load center
The risk. It obligates you to buy 100% of your energy from the supplier, blocking self-supply, distributed generation (rooftop solar, cogeneration), or a second provider to diversify risk.
How to renegotiate. Negotiate the right to self-generate a percentage (for example, up to 20% via your own solar) without penalty. If you plan distributed generation in the future, this clause defines whether you will be able to do it, and it is worth cross-checking against what your CFE feasibility letter says about grid capacity.
Summary table: the 8 clauses
| # | Clause | Main risk | Negotiation lever |
|---|---|---|---|
| 1 | Take-or-pay | Paying for energy not consumed | Tolerance band and historical minimum |
| 2 | Opaque indexation | Real price different from the teaser | Formula in writing and 36-month modeling |
| 3 | Early exit | Getting chained down | Capped and decreasing penalty |
| 4 | Excessive guarantees | Tied-up capital | Adjustment to real risk and progressive reduction |
| 5 | Automatic renewal | Losing the window to renegotiate | Eliminate it or require supplier notice |
| 6 | Unilateral change-in-law | Regulatory risk passed on | Narrow scope and cap the pass-through |
| 7 | Uncapped pass-through | Price inflated by hidden items | Closed list and caps |
| 8 | Total exclusivity | Blocking self-generation | Right to self-generate a percentage |
The pattern behind the eight
The eight clauses share one logic: they shift risk from the supplier to the user. That does not make them illegitimate —a contract allocates risk—, but it does require the user to know how much risk they are accepting and in exchange for what price. An offer with hard clauses should come with a clearly better price. When the price is only marginally better and the clauses are hard, the offer is bad even if the cover number is attractive.
How Enerlogix reviews your contract
At Enerlogix we review the contract clause by clause as part of the Plan 360 Management, before you sign. We model the financial impact of each clause on your real numbers, prioritize what to negotiate, and accompany you at the table. As an independent advisor, we do not charge a spread on your energy: our job is for you to sign the best possible contract.
Learn the full process in the pillar guide Buying energy through a Qualified Supplier and how to negotiate the spread.
Request a review of your contract or learn about the energy procurement service.
Frequently asked questions
It is the clause that obligates you to pay for a minimum volume of energy even if you do not consume it. If your production drops because of a technical shutdown, a recession, or seasonality, you pay for energy you did not use. It is the clause that generates the most surprises. It is renegotiated by asking for a tolerance band, for example that take-or-pay applies only below 80% of the volume, and by tying the minimum to a real historical average rather than to your consumption peak.
Because the fixed price rarely is: it is indexed to natural gas, the exchange rate, or inflation. If the formula is opaque or tied to an index you do not control, the second-year price can be very different from the first-year teaser. It is advisable to demand the complete formula in writing with the exact index and the adjustment factor, and to model the contract over 24 or 36 months. A low price with aggressive indexation usually turns out more expensive than a high one with contained indexation.
By capping it at a reasonable amount that decreases over time, instead of a penalty equal to the present value of all the remaining margin. It is also advisable to negotiate grounds for exit without penalty, such as a breach of the service level, recurring billing errors, or service degradation. The goal is not to be chained to a supplier even if its service worsens or a better offer appears.
It is the change-in-law clause that allows the supplier to pass on to you any cost arising from changes to the regulatory framework, and Mexico modifies its energy framework frequently. Without limits it turns regulatory risk into your exclusive problem. It is renegotiated by narrowing which changes apply, demanding documented evidence of the real impact, and negotiating a cap or a sharing of the risk between the parties.
Not without negotiating. Total exclusivity obligates you to buy 100% of your energy from the supplier and blocks self-supply, distributed generation such as rooftop solar or cogeneration, and diversification with a second provider. It is advisable to negotiate the right to self-generate a percentage, for example up to 20% via your own solar, without penalty, especially if you plan distributed generation in the future.
Only if the price is clearly better. Hard clauses shift risk from the supplier to the user, and that should come compensated with a much better price. When the price is only marginally lower and the clauses are hard, the offer is bad even if the cover number is attractive. That is why it is advisable to model the financial impact of each clause on your real numbers before deciding, rather than just comparing the first-year price.
