The US aims for 100 hours of discharge time for storage systems


The US Department of Energy has announced ten projects will receive funding to develop energy storage systems able to provide electricity to the grid for up to 100 hours.

The funding is being sourced from government agency Advanced Research Projects Agency-Energy as part of the Duration Addition to Electricity Storage (DAYS) programme.

The aim is to enhance grid resilience and performance.

Paul Dabbar, under secretary for science, said: “The Department of Energy is committed to researching innovative energy technologies and discovering opportunities to make America’s energy infrastructure more competitive and more secure.

“The DAYS awardees will take a good look at what tomorrow’s grid-scale storage could be, and work to develop the technologies that get us there.”

Increasing discharge times for energy storage systems will enable a new set of applications for grid storage, including long-lasting backup power and greater integration of intermittent, renewable energy resources.

To date, energy storage with limited time, is being used to alleviate congestion, stabilise grid frequency and voltage, or provide intraday shifting services.

DAYS will focus on combining long-term power output technologies, like pumped storage hydroelectric (PSH) systems, with the flexibility of the battery system.

PSH systems account for 95% of stationary energy storage capacity in the US whilst lithium-ion batteries have experienced a rapid growth in deployment on the grid, but high-cost limits viability in long-duration applications.

Projects selected to receive the funding include Brayton Energy ($1,994,005) and Echogen Power Systems ($3,000,000).