As a dude working at a solar thermal startup, i would be really excited to see this work. OTOH, solar thermal is already about 30% cheaper than photovoltaics,

As a dude working at a solar thermal startup, i would be really excited to see this work. OTOH, solar thermal is already about 30% cheaper than photovoltaics, so that diruthenium is gonna have to be replaced by something really, really cheap... Our tank losses are nonzero, but in the scheme of things, not all that huge, either. So for it to become cost effective, this storage would have to compete with basically water and glycol in cheap, unpressurized tanks.