Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Passage: The pavilions are named for Exelon, a Chicago-based company that generates the electricity transmitted by its subsidiary Commonwealth Edison (ComEd). The city of Chicago has collaborated with Exelon and ComEd on a variety of environmental projects, including the installation of solar power in buildings, support for sustainable design and renewable energy, and furthering educational and social awareness of green architecture in the city. The pavilions cost $7 million, $5.5 million of which was donated by Exelon and ComEd.The lead designer for the North Pavilions was Thomas H. Beeby of Hammond Beeby Rupert Ainge Architects. Beeby's designs for the North Pavilions are "in harmony with the Harris Theater", for which he was the architect as well. The North Pavilions are along Randolph Street on either side of the theater, which is Millennium Park's indoor performing-arts venue.The South Pavilions were designed by architect Renzo Piano of Renzo Piano Building Workshop. Piano designed the Art Institute of Chicago's Modern Wing, which is across Monroe Street from the South Pavilions and opened in 2009. The facades of the South Pavilions are limestone and glass in order to complement the Modern Wing, even though it was not completed until several years after the pavilions were finished. Piano also designed the Nichols Bridgeway, which connects Millennium Park and the Art Institute, and is next to the Southwest Pavilion.The design process for the Exelon Pavilions began in September 2001, with construction starting in January 2004. The general contractor for all four pavilions was Walsh Construction. The South Pavilions were completed in July 2004 and opened when Millennium Park celebrated its grand opening on July 16, 2004. The North Pavilions were not finished in July 2004, but were completed in November of that year. All four Exelon Pavilions were officially opened to the public on April 30, 2005.
A:
What company does the man that designed the South Pavilions work for?