Grid-Level Energy Storage

Bill Gates-backed startup Antora Energy is preparing to roll out a containerized, modular heat battery, designed to store renewable energy at the lowest possible cost – then release it efficiently as electricity or industrial process heat.

UK company RheEnergise is quietly rolling out an interesting new approach to pumped hydro energy storage, aiming for a capacity of at least 100 MW by 2030. It works with small hills instead of mountains, making it relevant in many more areas.

PNNL researchers have discovered that dissolving a simple sugar into the electrolyte in a flow battery boosts peak power output by a remarkable 60%. What's more, after being constantly cycled for a year, the battery lost almost none of its capacity.

Gates- and Bezos-backed startup Form Energy is one of the most exciting companies in the grid-level renewable energy storage space, with a multi-day iron-air battery system just 10% the cost of lithium. A 10-MW/1-GWh demo system has now been approved.

The state that built the world's first grid-level "big battery" is striking out on an even more ambitious green energy project: the world's biggest hydrogen power station, fed by an electrolysis facility 10 times larger than anything running today.

One of the most exciting companies in grid-level renewable energy storage is Form Energy, whose innovative iron-air technology promises to outperform lithium "big battery" projects at 10% of the cost. It's preparing to scale up with its first factory.

Denmark's Hyme Energy wants to save shut-down fossil-fuel heat and power plants by repurposing them as renewable energy storage and release facilities using technology borrowed from the advanced nuclear sector. Its first plant will be online by 2024.

The world's largest and, more importantly, most efficient clean compressed air energy storage system is up and running, connected to a city power grid in northern China. It'll store up to 400 MWh of energy and release enough power for 40-60,000 homes.

Industrial heat consumes a huge proportion of global energy. Rondo Energy says its brick-toasting heat storage device is so cheap and efficient that it makes decarbonization an instant no-brainer across a huge range of industries. Bill Gates agrees.

Aluminum has an energy density more than 50 times higher than lithium ion, if you treat it as an energy storage medium in a clean redox cycle system. Swiss scientists are developing the technology as a renewable energy stash for the European winter.

Polar Night Energy says it's developed and commercialized a super-cheap, super-simple way of storing energy for anywhere between hours and months, simply using heated sand. Its first 8-megawatt-hour thermal battery has gone online in Finland.

In less than 18 months, Energy Dome has opened the first of its remarkable grid-level energy storage plants. These "CO2 batteries" store renewable energy over long periods and release it quickly, at less than half the cost of big lithium batteries.