Good to see progress in large-scale energy sources. As always we ideally would like to know current and prospective costs per MWh of storage, per MW of capacity

Good to see progress in large-scale energy sources. As always we ideally would like to know current and prospective costs per MWh of storage, per MW of capacity, round-trip efficiency, raw material mass flows and recyclability, and space requirements to fully judge. I understand that these metrics are not always reliably available in new issue tech. We should make a worksheet or something to help navigate these complex issues. At least more people are talking about hydrogen as an energy carrier these days as opposed to a raw energy source, which was a huge misconception in the hydrogen excitement bubble of ~2005. And a nitpick: headline should be about storing intermittent energy, not renewable energy. I personally hate the term renewable because not all renewable energy is low-carbon (e.g. most biofuels) and not everything that's sustainable for hundreds of millions of years is considered renewable (e.g. nuclear with breeder reactors or seawater uranium extraction).