Virtual power plants are an old idea being revolutionized by new technology. VPPs bundle distributed energy resources, such as rooftop solar, demand response, energy storage and electric-vehicle chargers, into a single grid-scale resource. Proponents say they are essential to decarbonizing and meeting growing demand. The U.S. Department of Energy says VPPs could provide as much as 20 percent of demand in 2030. John Manetti and Aaron August come on Energy West to talk about Puget Sound Energy's VPP, which launched in November. It is about 30 MW now. The company plans to expand it to at least 86 MW by the end of 2025 and could provide 10 percent or more of the company's demand in just a few years.