The jail microgrid is one of the largest and most advanced in the United States. It's the latest example of an emerging smart-grid technology that's providing a cleaner, more reliable, and, in some parts of the country, significantly cheaper alternative to the conventional grid. "In many cases, it has a very nice payback, with our without subsidies," says Michael Clark, president of Fort Collins, Colorado-based Encorp, which recently installed the software and equipment needed to manage the jail's microgrid. Microgrids also provide new ways to use solar and wind power. Ordinarily, the intermittent nature of such power sources makes them a challenge for utilities. By integrating them with batteries and other sources of power, they can provide a reliable boost to conventional power supplies to help utilities meet peaks in demand.
Microgrids are a step beyond either emergency backup systems or stand-alone solar-panel arrays. They use special software and power electronics to integrate multiple sources of power and energy storage to provide electricity around the clock, even when the sun isn't shining or regulations limit the use of diesel generators. In the case of the system at the jail, Encorp has installed networked controllers—the size of large computers—at each source of electricity, including a large array of thousands of batteries, as well as at the point where the jail connects to the grid. Coordinating power from diesel generators, solar panels, and other sources of power also requires equipment that can adjust the frequency and voltage of the power they produce.
Clark says Encorp has developed algorithms to help the system get the most out of each power source. At the jail, where the system is connected to the grid, this includes responding to the needs of a utility. If the utility experiences a large spike in demand, the microgrid can respond by selling excess power to the utility.
At certain times, it makes sense to use the system's ability to temporarily decrease power consumption at the jail for things like the air-conditioning or lighting to create more excess power to sell to the grid.