I assume you mean 10 joules per GigaHash (with ASICs), a joule being a watt-second. Put another way, such an ASIC doing a GigaHash per second would consume 10W

I assume you mean 10 joules per GigaHash (with ASICs), a joule being a watt-second. Put another way, such an ASIC doing a GigaHash per second would consume 10W. It's bad enough that science journalists routinely confuse energy and power units -- let's not do it here on HN!