Vattenfall, SSAB and LKAB have reached the halfway point in the construction of a rock cavern storage facility in a coastal city in northern Sweden. The 100-cubic-meter facility is being constructed 30 meters below ground and will begin storing green hydrogen next year. Full story: https://www.pv-magazine.com/2022/03/21/swedens-first-rock-cavern-for-green-hydrogen-storage-takes-shape/