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Unicom Corp

Unicom Corp was an American energy holding company formed from Commonwealth Edison and later merged with PECO Energy to create Exelon Corporation.

Last updated August 26, 2026

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Overview

Unicom Corporation was an American energy holding company established in 1994 as part of a corporate identity and organizational restructuring at Commonwealth Edison. Its principal operating subsidiary was Commonwealth Edison, the Illinois electric utility responsible for producing, purchasing, transmitting, distributing, and selling electricity to residential, commercial, industrial, and wholesale customers. Unicom therefore functioned primarily as a parent and holding structure rather than as a consumer-facing product brand. The company emerged during a period of significant change in the American electric-utility industry. Commonwealth Edison executives pursued a new corporate image while the sector was preparing for possible deregulation and increased competition. Unicom's creation separated the parent identity from the operating utility's established name, while preserving Commonwealth Edison as the principal electricity business. James J. O'Connor served as Unicom's chairman and chief executive from its formation until 1998. In 1997, Unicom announced plans to reenter the natural-gas business. The proposed return followed Commonwealth Edison's earlier departure from that sector in 1954, when Northern Illinois Gas Company had been spun off. The announcement reflected the company's effort to broaden its energy portfolio as deregulation discussions raised the prospect of more competitive, integrated energy markets. The available reference material does not establish the extent to which this reentry plan was implemented. O'Connor left the chief executive position in 1998 after the company was described as underperforming. John W. Rowe succeeded him and became chief executive, chairman, and president. Under Rowe, Unicom pursued a major combination with PECO Energy Company of Pennsylvania. In September 1999, the companies announced a planned merger valued at approximately $16 billion. The transaction closed on October 23, 2000, ending Unicom as an independent corporate entity and forming Exelon Corporation. The merger was among the largest transactions in the utility sector at the time. The combined company brought together Unicom's Commonwealth Edison operations and PECO Energy's businesses, creating a major American electric utility. Following the transaction, Exelon had the largest collection of nuclear power plants in the United States according to the referenced account and ranked among the country's largest electric utilities. Unicom's historical significance therefore lies in its role as the corporate predecessor of Exelon and in its participation in the consolidation and restructuring of the U.S. energy industry around the turn of the twenty-first century.

History

Unicom Corporation was created in 1994 from Commonwealth Edison after company executives considered changing and modernizing the organization's corporate image. Rather than replacing the operating utility's established identity, the new structure placed Commonwealth Edison under Unicom as its principal subsidiary. Commonwealth Edison continued its core role in the electricity sector, including generation, electricity purchases, transmission, distribution, and sales to residential, commercial, industrial, and wholesale customers. The company was formed during a period when the U.S. electric-utility industry was debating deregulation and the introduction of more competitive market structures. James J. O'Connor led Unicom as chairman and chief executive from 1994 through 1998. In 1997, the company announced that it intended to reenter the natural-gas industry. Commonwealth Edison had exited that business in 1954 after the spin-off of Northern Illinois Gas Company. The proposed return to natural gas was presented in the context of changing energy markets, although the available source does not document the eventual operational outcome of the plan. O'Connor left the chief executive role in 1998 following reported underperformance. John W. Rowe replaced him and took on the combined positions of chief executive officer, chairman, and president. Rowe subsequently led Unicom toward a large-scale combination with PECO Energy Company. The planned transaction, announced in September 1999 and valued at about $16 billion, reflected a wider trend toward consolidation among large American utilities. The merger was completed on October 23, 2000. It created Exelon Corporation and brought Unicom's Commonwealth Edison business together with PECO Energy. The transaction ended Unicom as a standalone company. Exelon subsequently became one of the largest electric utilities in the United States and, according to the referenced account, controlled the country's largest collection of nuclear plants while generating more than $12 billion in annual revenue. The revenue figure is associated with the post-merger Exelon context rather than with Unicom as a standalone company. Unicom is consequently best understood as a historical corporate predecessor and energy-industry holding structure rather than an active brand.

  • 2000

    Exelon is formed

    [1]

    The Unicom–PECO Energy merger was completed on October 23, creating Exelon Corporation.

  • 1999

    Merger plan with PECO Energy is announced

    [1]

    Unicom announced a proposed approximately $16 billion merger with PECO Energy Company.

  • 1998

    Leadership changes

    [1]

    James J. O'Connor stepped down as chief executive and John W. Rowe became chief executive, chairman, and president.

  • 1997

    Natural-gas reentry is announced

    [1]

    Unicom announced plans to return to the natural-gas industry, which Commonwealth Edison had left in 1954 after spinning off Northern Illinois Gas Company.

  • 1994

    Unicom Corporation is formed

    [1]

    Unicom was established as a holding company following Commonwealth Edison executives' consideration of a corporate image and organizational makeover.

Products and positioning

A U.S. energy holding company organized around Commonwealth Edison's electricity business, with an attempted expansion toward natural gas and a later strategic combination with PECO Energy.

  • Electric utility · 1994

    Commonwealth Edison electricity operations

    Unicom's principal business was conducted through Commonwealth Edison, which produced or purchased electricity and handled its transmission, distribution, and sale. The utility served residential, commercial, industrial, and wholesale customers. These operations formed the central operating foundation of Unicom and later became part of Exelon after the 2000 merger.

  • Natural gas · 1997

    Natural-gas business expansion

    In 1997, Unicom announced an intention to reenter the natural-gas industry. The initiative was linked to anticipated changes in utility regulation and the company's interest in broadening its energy activities beyond electricity. The available source confirms the announcement but does not establish the scope or completion of the planned business.

Brand decisions

  • 1999

    Proposed merger with PECO EnergyM&A

    Background

    Unicom pursued a major combination during a period of consolidation and regulatory change in the American electric-utility sector.

    Action taken

    Unicom announced a planned merger with PECO Energy Company valued at approximately $16 billion.

    Aftermath

    The transaction closed on October 23, 2000, creating Exelon Corporation and ending Unicom as an independent company.

    Announced transaction value. (1999 announcement)

  • 1997

    Plan to reenter the natural-gas industryStrategy

    Background

    Unicom had an electricity-centered business, while the U.S. utility industry was considering deregulation and broader competition. Commonwealth Edison had previously exited natural gas in 1954 after the spin-off of Northern Illinois Gas Company.

    Action taken

    Unicom announced that it intended to return to the natural-gas industry.

    Aftermath

    The available reference does not document the extent to which the plan was implemented.

Sources1 sources

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