A specialist firm built for the complexity of utility-scale storage — and the commercial reality behind it.
Nexion was founded by entrepreneurs and highly experienced professionals in renewable energies and technology who saw the same problem repeated across every market: storage projects failing not on technology, but on execution. Grid code compliance, control system integration, long-term operational performance — the gaps that turn a promising project into a costly one. We built Nexion to close those gaps. A Millenium Group Renewables Company.
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Storage infrastructure that earns its place on the grid
The world's energy transition is accelerating — and the grid is the bottleneck. Renewable generation is growing faster than the infrastructure needed to balance it. Storage is the answer. Nexion exists to build BESS systems that close that gap: technically rigorous, grid-compliant, and built to generate long-term revenue from day one.
Analysis before architecture
Every project starts with a thorough analysis of grid requirements, market conditions and operational objectives. We design the right structure from the outset — one built to grow, not to be rebuilt.
Technology independence
Our technology partners jointly invest in R&D and innovation to bring the best resources and products to every project — selected not by commercial ties, but by what will perform best in that specific application, at that specific scale.
Built for the long term
We design systems for 20 years of operation and expanding capacity. Our O&M teams operate the same assets our teams designed — which means we are accountable for performance long after commissioning.
Regulatory and market depth
Grid codes, ancillary service markets, permitting frameworks — we have the in-house expertise to navigate the regulatory complexity of every market we operate in, and to position each asset for maximum long-term revenue.
Bankable by design
A storage project that is well-structured, revenue-proven and compliantly operated is not just a technical asset — it is a financial one. When the business model works, the project is bankable and insurable. We build every system with that outcome in mind: structured to attract project finance, satisfy lender due diligence and meet the requirements of leading energy insurers from day one.
From renewable energy expertise to utility-scale storage
The foundation is built
Millenium Group Renewables establishes a decade-long track record developing and operating renewable energy infrastructure across Spain. Working across multiple projects reveals a consistent pattern: the technology exists, but the execution gap — grid compliance, system integration, long-term performance — is where projects fail. The case for a dedicated storage specialist becomes clear.
The decision to build Nexion
After rigorous market analysis and technology assessment, the founders conclude that the energy transition has reached a structural inflection point. Storage is no longer a future consideration — it is an immediate grid requirement. Nexion is conceived: a company with a single focus, built on deep operational experience, and designed to deliver where others fall short.
Nexion commences operations
Nexion Grid Storage Systems opens for business. The commercial and technical network is activated across EMEA and LATAM. An initial pipeline of projects is under active development — each one structured from the outset to be technically sound, grid-compliant and financially viable.
1,2 GW commissioned — target
Our near-term objective: more than 1,2 GW of utility-scale BESS capacity commissioned and operating across multiple markets. Assets generating measurable grid revenue. A performance record that lenders, insurers and offtakers can rely on. The groundwork for this milestone is being laid in every project we structure today.
Consolidation across EMEA and LATAM
Pipeline execution accelerates. Projects commissioned in new markets across EMEA and LATAM validate the replicability of the Nexion model beyond Europe. Strategic partnerships deepened. Financing structures refined. The business demonstrates that disciplined execution at scale is not a one-market achievement — it is a repeatable process.
3,0 GW pipeline — the long-term vision
More than 3,0 GW of utility-scale BESS capacity developed, constructed and commissioned across the markets — Europe, EMEA and LATAM. Eighteen active projects. A 24/7 international control centre fully operational. A company that has proven, at scale, that storage infrastructure built with rigour and commercial discipline is bankable, insurable — and built to last.
Local everywhere — global by design (Local Globally)
Nexion operates with in-country presence across its core markets. Local teams. Local grid expertise. Local regulatory relationships. Backed by a global platform that shares technology, capital and operational intelligence across every project. Not a multinational imposing a single model — a global company that earns its place in each market on local terms.
Working on a storage project?
Whether you need a technical partner for a new development or an independent assessment of an existing asset, our engineering team will respond within 48 hours.
Questions about the company
When was Nexion Grid Storage Systems founded?
Nexion Grid Storage Systems was founded in 2026 by entrepreneurs and renewable energy specialists with backgrounds in project development, grid engineering, and energy markets. The company is part of the Millenium Group Renewables portfolio.
How many engineers does Nexion have?
Nexion's core team comprises engineers and specialists across electrical engineering, power systems, civil works, grid compliance, and asset management. We scale delivery capacity through established regional partnerships, giving us project presence and capabilities across EMEA and LATAM.
What is Nexion's objective project pipeline?
Nexion has an active objective development pipeline of over 1,5 GW of utility-scale BESS projects across Spain, EMEA and LATAM. Our target is to have developed, built and commissioned more than 3,0 GW of capacity by 2030.
Does Nexion have a preferred battery technology?
Nexion selects the most appropriate technology — LFP, NMC, or VRFB — for each project based on technical and commercial merit.