A Historic Investment in Long-Duration Storage

In a landmark move for the long-duration energy storage (LDES) sector, Google has agreed to invest roughly $1 billion in Form Energy's iron-air battery system. Announced in early 2026, this massive project is set to serve a Google data center in Pine Island, Minnesota, and represents the largest battery project announced globally by stored-energy capacity.

Unprecedented Scale and Duration

The sheer scale of this project is staggering. The system will feature 300 MW of power capacity and an astonishing 30 GWh of stored energy. Unlike standard lithium-ion batteries that typically discharge for around four hours, this iron-air system promises a 100-hour discharge capability. This ultra-long duration is crucial for ensuring continuous, reliable power for energy-intensive AI data centers, even during prolonged periods of low renewable generation.

The project is estimated to cost around $1 billion and promises 100-hour discharge capability, making it the largest battery project announced globally by stored-energy capacity.

Economic and Technical Profile

Form Energy's iron-air technology offers a highly attractive economic profile for long-duration applications. The all-in cost is near $33 per kWh, significantly cheaper than lithium-ion systems which hover around $100 per kWh. Industry projections suggest future costs could drop even further to $20 per kWh.

However, this cost advantage comes with technical trade-offs. The technology achieves its low cost by utilizing iron and air, discharging through a process where iron rusts and releases hydrogen gas. Consequently, the round-trip efficiency is relatively low, ranging between 40% and 50%. Despite this, the economics of decoupling power from energy make it a highly viable solution for multi-day storage needs.

Xcel Energy will be responsible for installing the system, highlighting the collaborative effort between tech giants, storage innovators, and utilities to build the grid of the future. This project underscores the critical role LDES will play in supporting the exponential growth of AI infrastructure.

This article was assisted by AI analysis. Please refer to the original source for official information.