DIA (Denver International Airport) is pathetic on energy. I recently had a layover there from 11pm to 5 am. I cannot even count the ways they are wating uge amounts of electricity. Here are a few:

1. All the horizontal people movers (those moving walkways) have no IR sensor on them to have them stop when there's no one on them. (if you put a sensor on, it knows when someone enters it and runs for as long as it needs to + 10 sec). Instead, ALL of them ran full-time, a huge energy waste, all night long with NO PASSENGERS or workers using them.

2. All of the interior lights are on. Now, between about midnight and 5 am, there are no flights in/out of DIA. Why not turn 1/2 of the lights off automatically? No one needs that much light.

3. This is my favorite. The United Premier Lounge area (where you have to pay to be a member or fly a huge amount of miles to enter) is closed from something like 9pm to 6am, so they have the entry doors locked. But it's on the second floor, and the escalators to get you up there (which you can't do because the doors are locked) are running continuously, and the lights up there all appeared to be on.

These were the glaringly obvious ones, but there are more that I could list, and who knows what's happening down with all the automated baggage handling conveyors.

If they spent some time, minimal $, and INTELLIGENCE on efficiency, they wouldn't need the solar array.

I agree with the above comment, if they would try to save just a little bit they would not need the array.

If you look where they are placing it, it appears it is more for PR than saving energy.