Carolina Power Company were merged into Duke Power, although Southern Public Utilities, 100% owned by Duke Power, maintained a legally separate existence for the retail marketing of Duke-generated power to residential and commercial customers. Southern Public Utilities also operated transit systems, which Duke eventually converted from streetcars to buses. In 1988, Nantahala Power & Light Co., which served southwestern North Carolina, was purchased by Duke and is now operated under the Duke Power Nantahala Area brand. In 1990, Duke sold its remaining transit operations. Duke Power merged with PanEnergy, a natural gas company, in 1997 to form Duke Energy. The Duke Power name continued as the electric utility business of Duke Energy until the Cinergy merger. With the purchase of Cinergy Corporation announced in 2005 and completed on April 3, 2006, Duke Energy Corporation's customer base grew to include the Midwestern United States as well. The company operates nuclear power plants, coal-fired plants, conventional hydroelectric plants, natural-gas turbines to handle peak demand, and pumped hydro storage. During 2006, Duke Energy also acquired Chatham, Ontario-based Union Gas, which is regulated under the Ontario Energy Board Act (1998). On January 3, 2007, Duke Energy spun off its gas business to form Spectra Energy. Duke Energy shareholders received 1 share of Spectra Energy for each 2 shares of Duke Energy. After the spin-off, Duke Energy now receives the majority of its revenue from its electric operations in portions of North Carolina, South Carolina, Kentucky, Ohio, and Indiana. The spinoff to Spectra also included Union Gas, which Duke Energy acquired the previous year. In 2011, Duke Energy worked with Charlotte’s business leader community to help build Charlotte into a smart city. The group called the initiative "Envision Charlotte". At the time, the group decided on a goal to reduce energy use in the "urban core of the city by 20 percent". To do so, the group focused on making energy consumption changes to commercial buildings larger than 10,000 square feet. On July 3, 2012, Duke Energy merged with Progress Energy Inc with the Duke Energy name being retained along with the Charlotte, North Carolina, headquarters. Duke announced on June 18, 2013, that CEO Jim Rogers was retiring and Lynn Good would become the new CEO. Rogers has been CEO and Chairman since 2006, while Good was Chief Financial Officer of Duke since 2009, having joined Duke in the 2006 Cinergy merger. Rogers' retirement was