AI Data Centers: Battery Boom Expected
The infrastructure question of power supply for data centers is recharging. It's no longer just about the availability of electricity, but about its stable, fast, and local provision, especially when data centers briefly switch on high loads. Two developments are intertwined here: the global expansion of data centers, including AI workloads, and electricity market reforms that make energy storage economically more attractive.
Source: Own depiction
Introduction
The increasing demand for data centers, especially due to KI-Workloads, , is leading to a re-evaluation of energy infrastructure. The challenge lies not only in the amount of electricity required but also in the ability to provide it stably, quickly, and locally. This comes at a time when electricity market reforms are making energy storage more economically attractive.
Need for energy storage
Data centers do not grow uniformly but are concentrated at a few nodes. There, grid expansion becomes a bottleneck. The International Energy Agency (IEA) forecasts, that global electricity consumption by data centers will rise to around 945 TWh by 2030, which is a doubling compared to today. This increase is critical because it occurs locally concentrated and pushes grids to their connection limits. In Europe, a similar problem is described: rising data center loads often meet too little free grid capacity, which exacerbates system planning. A concrete example is Virginia, which is designated by Dominion Energy as the largest data center market in the world and where individual large customers are driving demand strongly. For grid operators, this is risk management. The NERC describes "emerging large loads", , including data centers, as a new challenge for planning, connection processes, and system stability. As soon as the load becomes so large that it influences grid dynamics, storage becomes interesting. It serves not only as an add-on but as a tool to cap peaks, smooth transitions, and gain time in case of disruptions.
Source: tycorun.com
The energy hunger of AI data centers is driving up the demand for powerful battery storage systems.
Batteries in Data Centers
Traditionally, batteries in data centers serve as USV-Systeme, that buffer electricity for a short time until generators take over. What is changing is the scale and the logic of use. Operators are increasingly replacing VRLA lead-acid batteries with lithium-ion solutions, as they offer a longer lifespan, require less space, need less maintenance, and are better suited to modern power electronics. The spread of lithium-ion UPS in data centers is a reality, as is the Uptime Institute bestätigt. The crucial second step is that battery systems become "grid-interactive". Microsoft describes its own tests where UPS batteries should provide grid support services during normal operation. . This is technically plausible: how Eaton beschreibt, modern UPS with suitable controllers can control battery energy in parallel with the grid, including demand response, without disconnecting the data center from the grid. Colocation providers such as Digital Realty und Enel X also pursue the goal of using integrated UPS batteries for grid balancing services. This is happening because peak loads and grid restrictions act like a second availability issue in everyday operations. Not only outages are expensive, but also power limitations, connection requirements, and expensive peak power tariffs are noticeably felt in terms of business economics.
Source: takomabattery.com
Modern data centers integrate batteries directly into server racks to ensure uninterruptible power supply.
China's Role
Reuters beschreibt den aktuellen Schub in China as a combination of global data center construction and an electricity market reform that makes storing electricity more profitable. Chinese companies could increase their global deliveries of lithium-ion cells for stationary energy storage by 75% by 2025. China already exported over 65 billion US dollars in storage and EV batteries in 2025. In parallel, China is following suit at the state level: the Chinese government reports on a plan by NDRC and NEA, which aims for over 180 million kW of "new-type energy storage" by 2027 and is expected to trigger around 250 billion yuan in project investments. Reuters hat diese Zielgröße ebenfalls aufgegriffen. The reforms not only promote capacity but also change market logic. New energy projects are expected to be increasingly based on market-oriented auctions rather than fixed off-take conditions, which increases the operating hours of storage. The Rocky Mountain Institute describes, that market-oriented transactions in the electricity market are scaling, leading to increased price volatility and new demands for flexibility. Storage sells precisely this flexibility – minute reserve, frequency support, peak shaving, shifting solar surpluses. Thus, market reform meets data center reality.
Grid-side developments
The pressure is not just coming from AI. The IEA erwartet, that global electricity demand will grow by an average of 3.3% in 2025 and 3.7% in 2026, with data centers explicitly mentioned as drivers. For the USA, the EIA den Speicherausbau greifbar: In 2024, 10.3 GW of new utility-scale battery storage was added, and for 2025, the EIA expects 18.2 GW of additional battery storage capacity – a record year. The same agency estimates the cumulative utility-scale battery capacity in the US at the end of 2024 to be over 26 GW. These figures describe a new "base layer" for the grid: renewables fluctuate, grids age, large loads grow locally – and batteries become the fastest deployable flexibility option, provided permitting and connection cooperate. How much connection rules have become political technology is shown by Ireland: the regulator CRU has published a "Large Energy Users Connection Policy" that reorders the process for data center connections. Legal summaries reveal that by March 31, 2026, at the latest, processes and minimum requirements are to be published, including expected performance/availability of generation or storage from applicants. This is the point where "grid-scale" and "behind-the-meter" converge: the storage is either in the grid, at the substation, next to the solar farm – or directly next to the IT, with rules that can make it a condition for connection.
Source: techzeitgeist.de
Large battery storage systems play a crucial role in stabilizing the power grid and integrating renewable energies to meet the increasing energy demand of data centers.
Practical Implications
Anyone planning a data center today plans electricity like a second location question, with contracts, technology, and safety certifications that were still "nice to have" a few years ago. On the procurement side, more solar plus storage is being seen, as batteries can improve project economics and grid compatibility. Amazon nennt zum Beispiel Projekte, linking solar energy with battery storage, and estimates the scale of these co-developments at around 1.5 GW of battery storage capacity across ten projects. On the operational side, "grid-interactive" becomes more realistic as soon as providers operate their batteries in compliance with regulations and safely. UL beschreibt UL 9540A as a testing method developed for fire safety and construction requirements for Battery Energy Storage Systems (BESS). NFPA beschreibt NFPA 855 as a standard for the installation of stationary energy storage systems and as a framework for risk mitigation. This makes storage no longer just a question of kWh and MW, but of distances, fire compartments, detection, extinguishing concepts, and certifications – the kind of "paperwork" that accelerates or stops projects in reality. The battery boom is not happening because batteries are "cool", but because grids, markets, and data center budgets are simultaneously pushing in the same direction.