I must admit I hadn't thought of Las Vegas as a champion of sustainability, but maybe I should revise my views.
The power flows from a mix of solar panels and hydroelectric turbines including the Hoover Dam.
It seems odd to think about hydroelectric power in a desert as a renewable resource, but it does come from snow in Colorado.
http://www.ibtimes.com/lake-mead-water-level-drops-record-lo...
[1] https://en.wikipedia.org/wiki/Colorado_River_Compact [2] https://www.brookings.edu/blog/planetpolicy/2015/05/02/5-fac...
[1] https://en.wikipedia.org/wiki/Prior-appropriation_water_righ...
http://www.reviewjournal.com/business/energy/switch-reaches-...
http://www.wsj.com/articles/vegas-casinos-fight-to-buy-their...
They've been been among the fastest growing American cities since the 1980s. The impact on water useage has been substantial. ProPublica has an excellent series online: propublica.org/series/killing-the-colorado
This is one of those issues no one wants to talk about & Vegas suburban sprawl the past 30 years is a big part of the problem. A few solar panels the city puts up is a nice try, but no dice Las Vegas!