Photovoltaics are projected to satisfy over 40% of Switzerland's electricity requirements by 2050, but the fluctuating nature of solar power poses challenges for meeting winter demands. Switzerland aims to bridge this gap through a mix of imports, wind, hydropower, solar plants, and gas-fired power. To reduce reliance on imports and gas during winter, researchers at ETH Zurich have devised a novel approach to store hydrogen safely and affordably using iron. By leveraging the steam-iron process, excess summer solar energy is used to produce hydrogen from water in a stainless steel reactor filled with iron ore. This energy is stored as iron and water, then converted back to hydrogen in winter for electricity generation. The technology offers advantages including cost-effectiveness, scalability, and reusability of the reactor without special safety measures. While hydrogen production efficiency is a concern, it remains a viable option when alternatives are limited. The pilot plant at Hönggerberg showcases the practical application of this innovative storage method, signaling a promising solution for sustainable energy management.