Innergex Expands Chile's BESS Capacity by 210MWh
Innergex's 210MWh BESS expansion in Chile marks a critical step in the country's energy transformation. Discover the impact and future outlook!
Chile was supposed to hit 2GW of battery energy storage capacity by 2030. Instead, it's on track to reach 9GW by the end of 2026. That's not a rounding error — that's a country rewriting its own energy ambitions in real time.
Against that backdrop, Innergex and Prevalon Energy's energization of the San Andrés II BESS in Chile's Atacama region is more than just a project milestone. It's a signal of how quickly the BESS expansion in Chile is compressing timelines that seemed ambitious just two years ago.
A Second Act in the Atacama
The San Andrés II project adds 42MW/210MWh of capacity to an existing installation — the San Andrés BESS I, commissioned in summer 2024 — both of which feed directly into the San Andrés solar facility. Combined, the two phases now total 77MW/385MWh at a single site. That's a meaningful anchor project, not a pilot.
The decision to build on existing infrastructure rather than greenfield a new site is the kind of move that separates experienced operators from optimists. Shared interconnection, established permitting relationships, and a known grid injection point all significantly reduce development friction. When you're expanding onto a site you already operate, you're not starting from zero — you're compounding.
Innergex is running a parallel playbook at its Salvador site, where the Salvador II BESS — a 20MW/100MWh addition — is progressing toward energization. When complete, Salvador's combined capacity will reach 62MW/310MWh. Two sites, both expanding, both paired with existing solar. That's not coincidence; it's a strategy.
What Prevalon's Technology Actually Brings
The hardware at the heart of both projects is Prevalon's HD 511 liquid-cooled lithium iron phosphate (LFP) AC solution, bundled with power conversion systems that include inverters and medium-voltage transformers, a US-made energy management system, and a SCADA interface.
LFP chemistry is now the dominant choice for grid-scale storage globally — and for good reason. It trades some energy density for dramatically better thermal stability and cycle life, which matters enormously when deploying assets in the Atacama Desert, where ambient temperatures aren't forgiving. Liquid cooling compounds that advantage, keeping cells within optimal operating ranges without relying on the ambient air that would otherwise bake them.
The certifications matter too, especially in a market attracting increasing international capital. Prevalon's solution holds UL 1973 and UL 9540 safety certifications, complies with NFPA 855-2023 fire safety standards, and meets IEC 62443-5-1 Level Two cybersecurity standards. That last one is increasingly non-negotiable for grid operators and institutional investors alike. A BESS connected to critical infrastructure that doesn't meet baseline cybersecurity thresholds is a liability, full stop.
Prevalon itself is a Mitsubishi Power spinoff — a lineage that provides engineering credibility and supply chain depth that pure-play storage startups often can't match.
Chile's Storage Boom Is Structural, Not Cyclical
The numbers here deserve to be taken seriously. ACERA, Chile's renewable energy and storage association, projects approximately 9GW of BESS capacity — at an average four-hour duration — operational by the end of 2026. Chile's original 2030 target was 2GW. The country is poised to exceed that goal by 4.5x, four years early.
Why is Chile moving this fast? A few intersecting factors. The country's north — particularly the Atacama — has some of the highest solar irradiance on Earth, which drives enormous renewable buildout. But solar generation creates curtailment and price cannibalization without storage to absorb it. Chilean wholesale power prices have, at various points, gone negative for extended midday periods, destroying returns for solar-only projects. Storage solves that problem directly.
The pipeline is filling quickly. In April 2026, Spanish IPP Sonnedix signed three PPAs for its 117MW/643.8MWh Sonnedix Librillo BESS. In March, Grenergy procured 2,600MWh of battery equipment for its Central Oasis solar-plus-storage complex. These aren't one-off announcements — they represent a wave of project finance decisions that take years to mature and are now hitting completion simultaneously.
Developers who locked in battery offtake agreements in 2023 and 2024, when equipment prices were falling sharply, are now sitting on favorable cost structures that make current project economics look very attractive.
What This Means for Investors
The Innergex-Prevalon expansion is instructive for anyone evaluating battery energy storage investment in Chile or similar high-irradiance markets. A few observations worth internalizing:
Phased development — building BESS I, operating it, proving the business case, then adding BESS II — de-risks capital deployment and generates operational data that informs the expansion. It's a more disciplined approach than the "bet everything on Phase 1" model, and it tends to produce better risk-adjusted returns.
Innergex itself underwent a significant ownership change when global investment group La Caisse acquired the company in July 2025. La Caisse's involvement signals institutional-grade confidence in the IPP's asset portfolio and growth trajectory — the kind of endorsement that reshapes counterparty perception for project financing discussions.
The clean energy growth story in Chile is no longer speculative. It has contracted revenue (PPAs), proven technology, established regulatory pathways, and a grid that demonstrably needs storage to function efficiently as solar penetration increases. That's a different risk profile than it was five years ago.
Where This Goes From Here
Salvador II is next. Once energized, Innergex will have four operational BESS installations across two Chilean sites — all paired with solar, all using Prevalon's technology stack. That kind of consistency across a portfolio isn't accidental; it reduces O&M complexity, allows for cross-site learnings, and gives the technology vendor incentive to provide premium service.
The broader question for Chile's battery energy storage market is whether grid infrastructure can keep pace with generation and storage additions that are outrunning original planning assumptions by a factor of four. Transmission constraints don't disappear because the storage pipeline is healthy. That's the next constraint the market will have to solve — and it's already the subject of conversations happening inside Chile's grid operator CNE.
For Innergex, the immediate milestone is completing the Salvador II energization. After that, the question is what comes next in a country that just blew past its own decade-long storage targets in roughly two years. Given the pace of everything happening in the Atacama, it probably won't be a long wait.
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