Question: While Packaging Corporation of America is headquartered in Lake Forest, IL, where is Duke Energy headquartered?

Context paragraphs:
Duke Energy Florida: Duke Energy Florida, formerly Florida Power, was the generation, transmission, and distribution sector of Florida Progress Corporation.  The company distributed power over much of central and north Florida.  Florida Progress merged with Carolina Power & Light in 2000 to form Progress Energy.  Progress Energy merged with Duke Energy in 2012.  Today the Florida operations operate as Duke Energy Florida.

Packaging Corporation of America: Packaging Corporation of America () is an American manufacturing company based in Lake Forest, Illinois.

Progress Energy Inc: Progress Energy, headquartered in Raleigh, North Carolina, is a subsidiary of Duke Energy and prior to its merger with Duke Energy was a Fortune 500 energy company with more than 21,000 megawatts of generation capacity and $9 billion in annual revenues.  Progress Energy includes two major electric utilities that serve approximately 3.1 million customers in the Carolinas and Florida.  As an independent company, the last chairman and CEO of Progress Energy was William D. Johnson; his predecessor was Robert McGehee, who died on October 9, 2007 at the age of 64 of a stroke while on a business trip to London.

Duke Energy: Duke Energy, headquartered in Charlotte, North Carolina, is an electric power holding company in the United States, with assets also in Canada and Latin America.

Lake Forest, Illinois: Lake Forest is a city located in Lake County, Illinois, United States.  As of the 2010 census it had a population of 19,375.  The city is along the shore of Lake Michigan, and is a part of the Chicago metropolitan area and the North Shore.  Lake Forest was founded around Lake Forest College and was laid out as a town in 1857 as a stop for travelers making their way south to Chicago.  The Lake Forest City Hall, designed by Charles Sumner Frost, was completed in 1898 and originally housed the fire department, the Lake Forest Library, and city offices.  Lake Forest is among the wealthiest cities in the United States.

Northwestern Lake Forest Hospital: Northwestern Lake Forest Hospital (NLFH) is a community-based hospital in Lake Forest, Illinois and a wholly owned subsidiary of Northwestern Memorial HealthCare, one of the nation's premiere academic medical centers.  The hospital was established in 1899 as Alice Home on the campus of Lake Forest College, and in 1942 a new hospital was built in its current location as Lake Forest Hospital.  On February 1, 2010, Lake Forest Hospital completed an affiliation agreement with Northwestern Memorial HealthCare and became Northwestern Lake Forest Hospital.

Crescent Communities: In 1939, Duke Power (now Duke Energy) established a forestry department to manage company land not used for power generation.  In 1963 this department became the company South Carolina Land and Timber.  As the holdings expanded to include land in North Carolina, the organization was renamed Crescent Land and Timber in 1969.  Some of the original land was sold to Crescent Land and Timber by the Singer Corporation.  In the mid-1980s the company was renamed Crescent Resources as it began to actively develop residential communities.  Crescent Resources began work on its first commercial development, Coliseum Centre, in 1990.  As of 1991, Crescent Resources managed 270,000 acres of land.  Holdings included part of what became Lake James State Park, which it later sold to the state of North Carolina. Crescent Resources became a separate entity from Duke Energy in 2006 with Duke Energy selling its 49% stake to Morgan Stanley.  Crescent Resources filed for bankruptcy in 2009 and has emerged from it separated from the utility company.  The company aimed to rebrand itself, renaming itself "Crescent Communities" in 2013.

Lake Forest station (Union Pacific): Lake Forest is a railroad station in Eastern Lake Forest, Illinois, United States served by Metra's Union Pacific / North Line.  The station is located at 691 North Western Avenue, is 28.3 mi away from Ogilvie Transportation Center, the inbound terminus of the Union Pacific/North Line, and also serves commuters who travel north to Kenosha, Wisconsin.  In Metra's zone-based fare system, Lake Forest is in zone F. Lake Forest station is located in downtown Lake Forest and is in close proximity to the Lake Forest Library.  The station has a ticket office which is open during the morning rush hour, Monday through Friday.

Lake Forest High School (Illinois): Lake Forest High School, or LFHS, is a public four-year high school located in Lake Forest, Illinois, a North Shore suburb of Chicago, Illinois, in the United States.  It is the only school of Lake Forest Community High School District 115, which serves the communities of Lake Forest, Lake Bluff, Knollwood, and smaller parts of Mettawa and North Chicago.  It is fed by Lake Bluff Middle School, Lake Forest Country Day School, Saint Mary's, and Deer Path Middle School.

Lake Keowee: Lake Keowee is a man–made reservoir in the United States in the state of South Carolina.  It was created to serve the needs of a power utility (Duke Energy) as well as public recreational purposes.  It is approximately 26 mi long, 3 mi wide, with an average depth of 54 ft , and a shoreline measured at 300 mi in total, and is approximately 800 ft above sea level.  It began in 1971 as a massive demolition and building project, including the construction of two large dams––Keowee Dam and Little River Dam––and covered 18372 acre of the state.  The lake collects or "impounds" waters from the Keowee River and the Little River and others, and the outflows below the respective dams join to form the Seneca River which flows into the larger Savannah River.  Lake water helps to cool Duke Energy's three nuclear reactors located at the Oconee Nuclear Generating Station.  In addition, the force of falling water through gravity helps generate hydroelectric power.  The Keowee Hydro Station generates 158 megawatts from the lake's outflows.  In addition, Lake Keowee has been touted as a recreational destination for fishing, boating, swimming, sailing, kayaking and other watersports, and the lake has been described as having pure and clean water.  The name "Keowee" (ᎨᎣᏫ) is a Cherokee name roughly translated as "place of the mullberries."  The former Keowee River, which was inundated by Lake Keowee, had been part of the Cherokee Lower Towns region, and Keowee Town had been located on the bank of the Keowee River.

Supporting paragraphs: Packaging Corporation of America Duke Energy
Answer: Charlotte, North Carolina