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Politics : Rat's Nest - Chronicles of Collapse -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (9142)	5/15/2009 9:31:14 AM
From: Wharf Rat	Read Replies (1) \| Respond to of 24233

Is a Heat Pump and Gravel the Answer to Energy Storage for the Grid? Some energy storage technologies for the power grid are expensive but can be deployed anywhere, like advanced batteries, while others are cheap but can only be built in certain locations, like pumping water up and down hilly terrain (known as “pumped hydro”). But a group of English engineers have built an advanced heat pump and connected it to an energy storage system using two silos full of plain old gravel that they say is as cheap as pumped hydro, as location-agnostic as a battery — and is super efficient. reuters.com