 The global energy transition is being driven by the integration of renewables like wind and solar power, which require energy storage solutions to ensure reliable supply. Battery storage is currently the most common option, but it has limitations due to high costs and limited capacity. A new energy storage system called isothermal deep ocean compressed air energy storage, HIDA-CAS, could offer a more affordable and efficient alternative. It involves compressing air at low temperatures and storing it underwater, then decompressing it when needed. The system is expected to cost between 500-000 per kilowatt of installed capacity and minus zero per kilowatt hour for energy storage. HIDA-CAS could be used to store energy for weeks, months or even seasons, making it ideal for coastal areas, islands, offshore and floating wind power plants, as well as deep-sea mining operations. This article was authored by Julian David Hunt, Ahinom Zakiri, Andreas Nashumento and others. We are article.tv, links in the description below.