No link to story available
Motherboard story from 2016 when ARES got approval to build a 50 MW facility in Nevada: https://motherboard.vice.com/en_us/article/z43mmy/this-grid-scale-battery-is-based-on-train-cars-and-good-old-gravity [vice.com]
BBC Click page that has two paragraphs of text to accompany the video: https://www.bbc.co.uk/programmes/p06c7fsr [bbc.co.uk]