On a recent trip to Las Vegas, I found myself wondering just how much energy is being consumed compared to other cities around the country. It doesn’t take much research to grasp the enormous amount of energy needed to power all the neon, slot machines, sound systems, sportsbook TV screens, and massive air conditioners required to make the desert city an international tourist destination. While recent efforts by resorts to “green” their operations have made an impact, they don’t address the root of the problem. Sin City is unique in its geographic location – which provides both challenges and opportunities to operate a sustainable energy system.
Can’t Take the Heat
Las Vegas’ desert location would be very uncomfortable throughout the summer without modern air conditioning. This presents significant challenges to resort designers who must overcome the desert sun to provide comfortable environments across millions of square feet. At the scale of an individual hotel room, this challenge is easier to understand. Large floor to ceiling windows are quite popular in the city but allow tremendous amounts of heat to enter the room. Simply installing automatic blinds or smart glass windows could dramatically reduce this effect.
Although HVAC systems have been a target of recent conservation efforts, older hotels rely on outdated systems. The New York, New York hotel I stayed in had only a very basic analog thermostat with simple controls and no ability to schedule. Innovations to improve the efficiency of commercial HVAC system are discussed in Navigant Research’s report, Advanced HVAC Controls. Perhaps the most effective addition to this hotel would be the installation of advanced occupancy sensors. Visitors in Las Vegas often spend long periods of time outside of their hotel rooms. In many cases, lights are left on and cooling systems set at full blast while a room is unoccupied for hours. Occupancy sensors, integrated with a more intelligent building management system (BMS), could dramatically reduce the amount of energy used by each hotel room. This could be an extremely beneficial investment for hotels that must absorb the cost of energy used by their guests. Solutions to improve efficiency in hotels are explored in detail in Navigant Research’s recent report, Energy Management in the Hospitality Industry.
While the natural environment of southern Nevada poses challenges to conserve energy, it also provides vast untapped potential to generate it. The Hoover Dam has enabled dramatic growth in Las Vegas over the years, although it currently provides barely 20% of the city’s peak energy needs. As noted in a recent blog by my colleague Mackinnon Lawrence, recent droughts threaten the reliability of this resource, as well as the viability of fossil fuel plants requiring large amounts of water to keep cool. A quick glance out my hotel room window revealed a massive casino roof – a perfect spot for a solar array totally unutilized. Satellite images of the city show that this is very common and little to no solar power is installed on roofs of power-hungry mega-resorts.
For a city that receives intense sunshine nearly year-round, this is a huge opportunity to generate clean and affordable power. And efforts are underway to take advantage of the clean energy resource available to the city. This past summer, MGM Resorts announced a partnership with NRG Energy to install a massive rooftop solar array at the Mandalay Bay Resort. The 20,000 panel, 6.2 MW installation is expected to generate nearly 20% of the Mandalay Bay’s power demand. This project represents an important step in the right direction; hopefully, it will inspire others in the city to fully utilize the natural resources available to them.
Tags: Building Systems, Energy Efficient Buildings, Renewable Energy, Smart Buildings Program, Solar Power
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