As you can probably already tell, it's going to be a close one, folks ... 
And the champion is ... 

For two major American cities 1,000 miles apart, Denver and Seattle share a lot in common (stunning natural beauty, liberal politics, thriving bike cultures, craft beer, insufferable foodies, pot, etc.) And although Denver boasts a slightly higher per capita square footage of certified green buildings (number four in the nation versus Seattle's number five), the Emerald City is, as its name would suggest, just a bit greener when it comes to clean energy and citywide efficiency.

Head on over to Opower's Outlier blog to learn more about how Seattle managed to beat its just-as-progressive Rocky Mountain cousin in the Efficiency Bowl.

Curious as to where New York City, the kind-of host city of Super Bowl XLVIII (while all the big parties are in Manhattan, the game is being played across the Hudson at remarkably green MetLife Stadium in East Rutherford, N.J., home to the New York's two NFL franchises, the Jets and the Giants) stacks up amongst other major cities in terms of energy efficiency? The Big Apple tied with San Francisco for an impressive number third place, trailing behind Boston and Portland, Ore. but beating both Seattle (fifth place) and Denver (eleventh place ) in the American Council for an Energy Efficient Economy's ' 2013 City Energy Efficiency Scorecard.

Infographic courtesy Opower

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Matt Hickman ( @mattyhick ) writes about design, architecture and the intersection between the natural world and the built environment.

Seattle vs. Denver: Which city rules in the realm of energy efficiency?
Seattle and Denver lead the pack when it comes to efficiency and clean energy but which will walk away as champion in the 'Efficiency Bowl.'