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Tech pulseENERGY

State Grid Launches 32 Billion Yuan Iron-Air Battery Project: Storage Costs Drop 60%, Renewable Revolution Accelerates

China's State Grid announces a 32 billion yuan investment to build the world's largest iron-air battery storage power stations, with storage costs falling below pumped hydro for the first time — a breakthrough moment for the renewable energy transition.

Overview

China's State Grid today officially broke ground on the "GW-Class Iron-Air Battery Storage" project, investing an initial ¥32 billion across synchronous construction sites in Inner Mongolia, Xinjiang, and Gansu.

This marks the commercial-scale debut of iron-air battery technology after years in the lab, solving the critical bottleneck in the renewable energy revolution: affordable, large-scale energy storage.

What Is Iron-Air Battery

An iron-air battery is a type of metal-air battery that generates electricity through iron oxidation, using nothing more than the oxygen drawn from the air. Its key advantages:

  • Abundant raw materials: Iron and air — essentially free
  • Exceptional safety: No thermal runaway risk, non-flammable
  • Extraordinary longevity: >10,000 cycle life, 20-year calendar life
  • Fully recyclable: Zero heavy metal pollution

Cost Comparison

Technology Storage Cost (¥/Wh) Cycle Life
Lithium-ion 1.2–1.8 4,000 cycles
Pumped hydro 0.6–1.0 >50,000 cycles
Iron-air 0.4–0.7 10,000 cycles

Iron-air battery storage costs have fallen below pumped hydro for the first time, making it the most economical long-duration energy storage solution available.

Impact on Renewables

This breakthrough directly accelerates renewable energy adoption:

  • Curtailment rate (excess renewable energy wasted) is expected to drop from 15% to under 5%
  • Solar-plus-storage electricity in Xinjiang and Inner Mongolia can be delivered at under ¥0.15/kWh
  • China's renewable penetration is projected to exceed 50% by 2028

Global Race

The US company Form Energy has been building iron-air storage projects in America, but none match the scale of China's new initiative. The EU quickly responded by adding iron-air batteries to its Strategic Energy Storage Technology list for policy support.