The shift from upright to drawer refrigerator/freezers is a fundamental energy efficiency issue: upright refrigerators are just fundamentally less efficient than drawer refrigerators, because the drawer retains cool air when the upright looses it.

However, the smart grid applications cited are not about energy efficiency directly as much as they are about making use of volatile power as it becomes available ~ of shifting consumption to match harvest.

In the US, the scope for consumer side energy efficiency gains is still tremendous, and in New York State they are getting a serious start on it with establishing finance paid through the utility bill based on financial savings from lower operating costs. Given our thoroughly corrupt political system, having that financial support in place is part of the political pre-requisite for gaining producer side regulation, since the greater the prospect of a market side win as a result of complying, the more likely the regulation is to get put into place.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.