What Is Phased Energization, and When Should Data Centers Adopt It?
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What Is Phased Energization, and When Should Data Centers Adopt It? Phased energization helps data centers navigate power constraints by energizing facilities in stages, but it’s not without limitations. Sometimes, the most efficient way to supply energy to data centers is to avoid powering them up all at once. Instead, operators may opt for a phased energization approach, which incrementally adds electrical capacity to data centers over time. In a world where power constraints are a major barrier to bringing data centers online, phased energization may play an increasingly important role in helping the industry navigate grid hookup delays and electricity shortfalls. However, phased energization also has its limitations and is not always the best approach for bringing data centers online or ensuring data center energy efficiency. What Is Phased Energization in Data Centers? Phased energization is the practice of gradually increasing the amount of electricity available to a facility. For instance, imagine a data center that requires 100 MW of power at full capacity. Instead of supplying all that energy from day one, the data center might start out with only 10 MW of electricity while operating at 10% of its total design capacity. From there, the data center would gradually increase the amount of power flowing into the facility, while also growing its IT capacity at an equivalent rate, until it reaches a full 100 MW load. Phased energization energizes data centers in stages, helping operators manage power constraints and bring facilities online incrementally. (Getty Images) How Phased Energization Works in Data Centers To implement phased energization, engineers typically divide data centers into zones (sometimes called data halls) and determine how much energy each one requires to become operational. Then, they bring the zones online one by one, based on power availability. This process doesn’t require fundamental changes to the design or implementation of data center electrical systems, beyond ensuring that each zone is isolated at the circuit and breaker levels (which they typically would be, even in a data center that wasn’t designed for phased energization). The key difference is how the data center is brought online: rather than a “big bang” event that powers the entire data center with the flip of a single switch, engineers energize the facility in segments. The Role of Phased Energization in Data Center Power Management Phased energization can be a useful data center power management tactic because it reduces the amount of electricity generation capacity data centers need to reserve (either by acquiring it from the grid or by building on-site, behind-the-meter power sources) before they can become operational. For facilities in areas with limited grid capacity – or where data center operators face pressure from local communities or regulators to avoid over-burdening electricity networks – phased energization can provide a significant advantage. It provides a flexible approach to navigating limited electricity capacity and bringing data centers online faster. In addition, phased energization can help to boost data center ROI by allowing facilities to come partly online sooner, rather than sitting idle while they await grid hookups or the installation of on-site generators. Data Center Phased Energization Challenges and Limitations While phased energization can help speed up the process of bringing data centers online, it’s not without potential drawbacks and limitations. They include: - Power forecasting challenges: Implementing phased energization requires accurate estimates of how much energy each data center zone will require. In practice, it’s hard to know exactly how much electricity servers will use until they’re operational, and their consumption can fluctuate over time. As a result, operators face the risk of over- or under-powering zones, leading to issues such as stranded capacity. - Power disruption risks: Power disruptions to existing zones may occur when new zones are energized. Theoretically, circuit isolation, transformers and UPS devices should mitigate these issues; in practice, given that all circuits are ultimately connected to the same incoming power source, there is a risk that suddenly flooding a data center’s power system with more energy could cause voltage fluctuations that impact servers already running, threatening data center uptime. - Limited grid capacity: For data centers that rely on the grid, phased energization doesn’t solve the issue of limited grid generation capacity. It only helps work through relatively short-term delays in grid hookups. If the grid ultimately won’t have enough capacity to fully power a data center, phased energization won’t help. - Bureaucratic complexity: Data centers that plan to source energy from the grid must also work with utility providers to energize their facilities in phases. This can be a complicated process – more so than connecting a facility at full capacity all at once – especially for utilities that aren’t experienced in phased energization. Faced with potential challenges like these, data center operators must decide whether the benefits of phased energization outweigh the drawbacks. Some might prefer to invest in on-site power generation capacity that can meet all their needs or adopt approaches such as co-funding grid-based energy production to streamline full-capacity grid hookups. What does seem certain, however, is that traditional approaches to data center power management are increasingly insufficient in the era of energy-hungry AI data centers and limited grid generation capacity. Phased energization is one of several tactics that data center operators can leverage to navigate these obstacles.
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