US battery storage projects face grid delays

Electricity use across the United States is increasing as data centers expand and electrification progresses in multiple sectors. In response, developers are planning and building more large-scale battery storage projects intended to support the grid during periods of high demand.

At the same time, declining battery prices have improved the economics of storage, encouraging more projects to move forward. This combination of higher power needs and more affordable technology has driven a sharp rise in proposals to add battery capacity across the country.

Despite the growing pipeline of storage projects, existing grid infrastructure is proving to be a limiting factor. After decades of relatively modest investment, many parts of the transmission and distribution system require upgrades before they can accommodate additional battery capacity.

Utilities and grid operators must complete technical work to connect battery facilities, but these efforts are constrained by shortages of key components. Transformers, circuit breakers and other grid equipment are in tight supply, slowing the pace at which upgrades can be carried out.

As utilities race to secure hardware and complete necessary improvements, timelines for grid upgrades are extending. Supply constraints for critical components create delays that ripple through project schedules and increase uncertainty for developers.

These delays are contributing to a buildup of battery storage projects in interconnection queues from coast to coast. Many large installations are waiting for approval and completion of grid work before they can begin operating and supplying power to the system.

The infrastructure demands of modern storage projects are illustrated by facilities such as Vistra Corp.'s (VST) Moss Landing Energy Storage Facility in Moss Landing, California. On-site systems include power inverters and extensive cabling outside the battery building, reflecting the technical complexity of integrating batteries with the grid.

Such installations require careful coordination between developers and utilities to ensure that both on-site equipment and off-site grid upgrades are completed in sequence. Until the broader supply and infrastructure bottlenecks are resolved, many similar projects are likely to remain in queues awaiting connection.