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Bettesworth Construction
battery storage

CFE Reports More Than 27% Construction Progress on Puerto Peñasco Solar Plant’s Sequence III

CFE reported more than 27% physical progress on Puerto Peñasco’s 300 MW Sequence III, with about 563,000 panels planned and operation forecast for December 2027.

By Bettesworth Construction Team 3 min read
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CFE’s Sequence III at the Puerto Peñasco photovoltaic plant had passed 27% physical construction progress in a status report published October 5, 2026. The 300 MW phase is planned to include about 563,000 solar panels, and its planned commercial-operation date is December 2027. The reported percentage is a project-status figure; the report does not state when or how progress was measured.

What the 27% construction figure covers

The October 5, 2026 report describes “avance físico superior al 27%”—physical progress above 27%—for Sequence III, not for the entire Puerto Peñasco plant. It does not provide an exact measurement date, calculation method, or independent audit, so the figure should be read as reported project status rather than a precise completion forecast. Publimetro México reported the milestone.

What is being built in Sequence III

Sequence III is planned as a 300 MW photovoltaic phase. A construction update says crews began driving structural posts on September 10, 2026, in the area of Centro de Transformación 2. The report describes posts driven a little over two metres into the ground using pressure or percussion machinery, with 84,182 posts and approximately 563,000 photovoltaic panels planned for the sequence. Publimetro México reported these construction details.

The same report attributes reduced excavation and concrete use, less soil disturbance, and easier eventual decommissioning to the pile-driving method. Those are stated project advantages, not independently verified environmental findings.

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How Sequence III fits into the full project

The four-sequence CFE project in Sonora is also known as Central Fotovoltaica Rafael Galván Maldonado. CFE procurement material lists photovoltaic capacities of 120 MW, 300 MW, 300 MW and 280 MW for sequences I through IV, respectively. The first two sequences are operating, with 420 MW of photovoltaic capacity and 72 MW of battery storage combined. CFE procurement material and a February 2026 CFE update describe the phases and operating status.

In a June 2026 presentation, CFE described the completed complex as 1,000 MW of solar generation and 246 MW of battery storage. It said sequences III and IV together would add 580 MW of photovoltaic capacity and 174 MW of storage. The June 24, 2026 government transcript records CFE Director General Emilia Esther Calleja Alor’s statement: “Las etapas tres y cuatro, que actualmente están en desarrollo, incorporarán 580 megawatts adicionales de capacidad fotovoltaica y 174 de almacenamiento.”

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Why the plant includes battery storage

Storage is intended to shift some solar electricity from hours when sunlight is available to periods when demand rises or solar generation falls. Calleja Alor explained: “¿Por qué es importante el almacenamiento en este tipo de proyectos? Porque permite guardar parte de la electricidad que estamos produciendo, de las horas donde la energía solar está vigente, y entregarla al sistema cuando aumenta la demanda o disminuye esta generación a través de la radiación solar.” This is CFE’s stated role for storage, not a claim about a measured operating result.

Storage figures depend on the document and project scope

Published figures are not fully consistent, so they should be kept tied to their source and scope rather than combined into a single settled specification.

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Figure Scope and qualification
103 MW of storage for three hours Sequence III figure in CFE’s December 2025 announcement and procurement material. CFE project announcement; CFE procurement material.
174 MW of storage Combined addition attributed to sequences III and IV in CFE’s June 2026 presentation; not a Sequence III-only figure. Government transcript, June 24, 2026.
246 MW of storage Completed complex total stated in the June 2026 presentation. Government transcript, June 24, 2026.
Up to 271 MW of storage Overall-project figure in CFE procurement material; the “up to” qualification is part of the stated figure. CFE procurement material.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Support on Ko-Fi

When the remaining sequences are scheduled to operate

The government project listing gives planned commercial-operation dates of December 2027 for Sequence III and March 2028 for Sequence IV. These are forecasts, not confirmed commissioning dates. Proyectos México’s project listing provides the schedule.

Overall, the reported 27% milestone applies to Sequence III, the 300 MW photovoltaic phase. Construction details and the planned schedule show what is underway, while the project’s storage specifications remain dependent on which CFE document and scope are being cited.

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