BESS Offtake & Contract Negotiation

Overview

Written from the buyer's side of the table, with the storage Disposiciones of 16 April 2026 and the capacity-accreditation rules as the organising subjects. Mexico now defines five ways a battery can be integrated into the national system, what each may sell and which tariffs apply — against a public record that holds two operating utility-scale batteries, one financed project and no disclosed storage price of any kind. The binding constraints are the modality chosen at the filing and, for storage that offers into the market, article 85 of the Ley del Sector Eléctrico, not anything negotiated afterwards. The edition takes each modality in turn — load centre, Autoconsumo, standalone storage and the almacenadora, co-located generation — then what the buyer is actually paying for, the unresolved question of three hours or six of accredited capacity, the contracting structures each modality permits, three clause handbooks written to be kept open beside a draft, and the permits, interconnection and conditions precedent that sit in front of the contract.

What this edition covers

Twenty parts: the map of what a battery can lawfully do for an energy buyer; choosing the modality; the storage rulebook, numeral by numeral; article 85 and the limits of revenue stacking; storage at a load centre; Autoconsumo; standalone storage and the almacenadora; co-located generation and storage; what the buyer is actually paying for; capacity accreditation — three hours or six; getting to the buyer; the contracting structures; three clause handbooks (performance, money and risk, the Mexican overlay); permits, interconnection and conditions precedent; the technical terms that decide commercial outcomes; three constructed worked negotiations; eighteen pitfalls; and who is actually transacting. Plus a Board Summary, a tear-out Field Checklist and six appendices.

Who this is for

Corporate and industrial energy buyers contracting for battery storage in Mexico, and the in-house counsel negotiating the contract — whether the battery sits behind the buyer's own meter, firms power from a renewable plant, sells capacity as a standalone asset or sits inside a self-consumption scheme.

What you get

• Regulatory position as at 9 October 2026, read from the primary texts and cited by article and numeral
• The five storage modalities, and what each permits a buyer to contract for
• Article 85 and the limits of revenue stacking, interval by interval
• Three clause handbooks: performance, money and risk, and the Mexican overlay
• Three hours or six: the capacity-accreditation question that decides how much battery you buy
• Three constructed worked negotiations, eighteen pitfalls and a tear-out Field Checklist
• The counterparty record: who is actually transacting in Mexican storage

Table of contents

1. How to use this guide
2. The Board Summary: Eight questions a board or general counsel will ask before signing, answered in a line each
3. Part 0 — The Map: What a battery can lawfully do for an energy buyer in Mexico, and what the record shows has actually been contracted
4. Part 1 — Choosing Your Modality: The choice made at the filing fixes what you can ever contract for
5. Part 2 — The Storage Rulebook: The Disposiciones of 16 April 2026, numeral by numeral, and what each one does to a contract
6. Part 3 — Article 85 and the Limits of Revenue Stacking: The same megawatt cannot be sold twice, and all of it must be offered to CENACE
7. Part 4 — Storage at a Load Centre: No injection, no sale, and the demand-response carve-out that survives
8. Part 5 — Autoconsumo: Storage at the consumption centre and at the plant, and when the plant's battery may inject
9. Part 6 — Standalone Storage and the Almacenadora: A permit, a market representative, and half the transmission tariff
10. Part 7 — Co-located Generation and Storage: Charging from your own plant costs you saleable energy
11. Part 8 — What the Buyer Is Actually Paying For: Demand charges, time blocks, nodal prices and capacity — and which of them a contract can move
12. Part 9 — Capacity Accreditation: Three Hours or Six: The unresolved question that decides how much battery you have to buy
13. Part 10 — Getting to the Buyer: Qualified supply, the thresholds, and the State's share of the system
14. Part 11 — The Contracting Structures: Tolling, storage services, availability, hybrid PPAs and capacity contracts — and which modality permits which
15. Part 12 — Clause Handbook I — Performance: Availability, dispatch, efficiency and degradation, from both sides of the table
16. Part 13 — Clause Handbook II — Money and Risk: Charges, charging energy, change in law, credit and the end of the contract
17. Part 14 — Clause Handbook III — The Mexican Overlay: What the modality, the permit filing and article 85 do to every clause you just negotiated
18. Part 15 — Permits, Interconnection and Conditions Precedent: The gates that sit in front of the contract, and who carries them
19. Part 16 — The Technical Terms That Decide Commercial Outcomes: MW against MWh, duration, cycles, depth of discharge and augmentation — each explained by what it does to the contract
20. Part 17 — Worked Negotiations: Three constructed cases, labelled constructed on the opening page
21. Part 18 — Pitfalls: Eighteen ways a Mexican storage contract goes wrong
22. Part 19 — Who Is Actually Transacting: The counterparty record, and how thin it is
23. The Field Checklist
24. Appendices — A · The Calendar · B · Glossary · C · On Sources, and the State of the Record · D · The Project and Counterparty Register · E · Index · F · Sources and References

Research and sources

127 numbered references, each cited at the point of use. Primary texts read on 9 October 2026, including the storage Disposiciones (DOF 16 April 2026), the Autoconsumo Disposiciones (DOF 12 December 2025), the storage chapter of the Ley del Sector Eléctrico and its Reglamento, the Manual del Mercado para el Balance de Potencia and the Bases del Mercado Eléctrico. Figures are given in the currency the source used, MXN or USD, with an as-of date; constructed figures are labelled as such.

Licensing

Single-user licence. For use by the named licensee only. Redistribution, resale, posting to shared drives or internal circulation beyond the named licensee is a breach of licence. Team licences covering up to five named users are available.