Mexico has introduced a structural shift in the role of battery energy storage systems (BESS) within its electricity sector following the publication of a new storage contract model on 17 March 2026 in the Official Gazette.
The new contractual framework establishes, for the first time, a specific scheme for grid interconnection and connection, formally integrating BESS into the national power system.
“Energy storage is no longer treated as a technical add-on without its own contractual framework; it becomes a fully recognised legal entity within the national electricity system,” said Javier Gaona, Principal BESS Consultant & Software Architect at Power Flow Analytics.
The regulation, issued by Mexico’s National Energy Commission (CNE), defines a mandatory and standardised framework with the state-owned utility Comisión Federal de Electricidad (CFE) acting as counterparty and the system operator Centro Nacional de Control de Energía (CENACE) as technical coordinator.
This regulatory shift directly impacts risk perception. The removal of contractual ambiguity—historically one of the sector’s main barriers—is already beginning to translate into improved financial conditions.
In this regard, Gaona noted that “what changes immediately is bankability” and projected “a compression of between 150 and 250 basis points in the discount rate”, a significant adjustment in a capital-intensive segment.
This change also redefines the nature of the asset. According to Gaona, storage moves away from exclusive reliance on merchant schemes and begins to be positioned—albeit partially—as infrastructure, although the development of ancillary services markets still presents limitations.
However, the real inflexion point lies not only in financing costs, but in the ability to capture value from new market services. Until now, much of BESS’s technical capability could not be translated into structured revenue.
“Previously, injecting energy into the grid operated in a legal grey area that increased insurance costs, complicated power purchase agreements (PPAs) and forced developers to build ad hoc structures that consumed time and capital. Without regulatory support, making revenue stacking bankable was nearly impossible—no lender commits to cash flows not recognised in contracts,” Gaona explained in an interview.
He added: “Now, the point of interconnection becomes a managed node with bidirectional obligations for metering, protection and reporting. This requires greater rigour in control system design, inverter selection and coordination with CENACE—but it also allows these flows to be documented with regulatory backing. This opens the door to energy arbitrage, frequency regulation and firm capacity—services that were previously technically feasible but financially non-monetisable.”
However, the executive stressed that the new regulatory framework does not eliminate all sector challenges, particularly those linked to technical design and project assumptions.
At this point, Gaona warned: “There is a risk that no contract can resolve—and it concerns me more than regulatory uncertainty: the quality of degradation models.”
According to his analysis, many current projections rely on tools that fail to reflect real battery behaviour under operating conditions. Differences between laboratory environments and real-world conditions—such as temperature, humidity or thermal cycling—can directly impact performance and expected cash flows.
“In my view, no model that ignores the non-linear interaction between internal and external factors deserves to be called a degradation model,” he stated, anticipating potential deviations between projected and actual performance over the asset’s lifetime.
In addition to this technical risk, a key execution constraint lies in the supply chain. Even with a clearer contractual framework, storage deployment faces tangible infrastructure limitations.
“The most severe bottleneck in Mexico today is not regulatory—it is physical,” Gaona said, noting that power transformers and interconnection equipment currently face delivery times of 18 to 36 months, forcing developers to rethink project timelines.
At the same time, battery manufacturers are prioritising projects with a higher degree of progress, introducing new competitive dynamics in the allocation of manufacturing capacity.
“It is not enough to have a signed contract; hardware must be secured in advance,” he emphasised.
Another factor increasingly shaping BESS profitability is nodal analysis, in a system where grid congestion is neither uniform nor constant.
“A rigorous analysis does not simply identify where capacity is available—it identifies where the combination of access, curtailment and price dynamics creates the optimal return equation,” Gaona explained.
With projections of up to 5 GW of storage capacity by 2030, Mexico is positioned for a strategic opportunity to scale BESS deployment, although its realisation will depend on execution quality.
In this regard, Gaona warned that the new framework will accelerate deployment, but not automatically. “The full equation requires four elements: the contract, the right node, secured equipment and a realistic timeline. All four,” he summarised.
“Mexico now has the regulatory framework, market signals and accumulated expertise to bypass the traditional learning curve. What will determine whether this opportunity materialises is not the contract itself, but the quality of decisions made over the next twelve months,” the specialist concluded.
