Using pressurized CO2 (which changes to a liquid under pressure, even at ambient temperature) to store energy. The pressurized gas is used to run a turbine to recover the energy. The CO2 gas is recaptured in a domed building with a bladder inside, and is re-pressurized to complete the cycle and “recharge” the storage. They …
Working on molten-salt reactor design and recycling nuclear waste as fuel. Currently in pre-licensing stage with target of 2028 for a working site. From Department of Energy report (link): Elysium Industries USA, Inc. aims to produce safe, cost effective, carbon conscious energy through the development of an advanced liquid-fueled reactor technology. The Elysium liquid-fueled reactor …
Using advanced forms of algae that can double in mass each day to capture carbon from the air. The sites are located in the desert and the algae that captures the carbon is buried after their life cycle is through, thus preventing the carbon from being released again. Website
Scientists in Sweden have developed a specialized fluid, called a solar thermal fuel, that can store energy from the sun for well over a decade. The article and paper are from 2018. It’s not clear where this has gone since then. Article Paper
Small modular reactors and fuel for them. The reactors are a high-temp gas cooled design. Helium is used as the cooling gas. The TRISO fuel pellets (see this reference) are “no larger than” a billiard ball and contain 18,000 particles of (assuming enriched) uranium wrapped in several layers of graphite. More than 200,000 of these …
Rolls-Royce (RR.L) has entered the business of small modular reactors. They have experience designing powerplants for submarines. It is assumed the design is a traditional pressurized water reactor using enriched uranium fuel, although they don’t talk about their design details. Website
Stores energy by super-cooling air and storing it in liquid form in large tanks. The energy is recovered by converting the liquid air back into a gas and using it to run a turbine. Website
Radiovoltaic technology that recycles nuclear waste to create long-life batteries. Micropower only. Website
Iron-air batteries are big and heavy, but relatively cheap per kilowatt-hour. Good for grid storage.Can discharge over a much longer timeframe than lithium-ion. A one megawatt system capable of 100-hour discharge time requires about one acre of land. They also offer a “grid modeling toolkit” which is software to model power grids. Website
Capturing carbon from the atmosphere and selling carbon credits. Website