[1]

Includes all wholesale and retail electric sales from third parties and affiliated sales to ComEd, PECO and BGE.

[2]

Other regions includes the South, West and Canada, which are not considered individually significant.

[3]

Other regions include the South, West and Canada, which are not considered individually significant.

[4]

Other represents activities not allocated to a region and includes retail and wholesale gas, upstream natural gas, proprietary trading, demand response, energy efficiency, the design, construction, and operation of renewable energy, heating, cooling, and cogeneration facilities, home improvements, sales of electric and gas appliances, servicing of heating, air conditioning, plumbing, electrical, and indoor quality systems, mark-to-market activities associated with Generation's economic hedging activities. In addition, includes generation under the reliability-must-run rate schedule and generation of Brandon Shores, H.A. Wagner, and C.P. Crane, the generating facilities planned for divestiture as a result of the Exelon and Constellation merger. Also includes amortization of intangible assets related to commodity contracts recorded at fair value at the merger date.

[5]

The intersegment profit associated with Generation's sale of AECs to PECO is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. See Note 2 of the Exelon 2011 Form 10-K for additional information on AECs. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations.

[6]

Other primarily includes Exelon's corporate operations, shared service entities and other financing and investment activities.

[7]

Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.

[8]

Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Regions. Intersegment revenues for Generation for the three months ended June 30, 2012 include revenue from sales to PECO of $125 million and sales to BGE of $84 million in the Mid-Atlantic region, and sales to ComEd of $203 million in the Midwest region, net of $4 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation. For the three months ended June 30, 2011 intersegment revenues for Generation include revenue from sales to PECO of $118 million in the Mid-Atlantic region, and sales to ComEd of $128 million in the Midwest region.

[9]

Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Regions. Intersegment revenues for Generation for the six months ended June 30, 2012 include revenue from sales to PECO of $235 million and sales to BGE of $103 million in the Mid-Atlantic region, and sales to ComEd of $451 million in the Midwest region, net of $15 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation. For the six months ended June 30, 2011 intersegment revenues for Generation include revenue from sales to PECO of $261 million in the Mid-Atlantic region, and sales to ComEd of $291 million in the Midwest region.

[10]

Amounts represent activity recorded at BGE from March 12, 2012, the closing date of the merger, through June 30, 2012.

[11]

For the three months ended June 30, 2012 and 2011, utility taxes of $19 million and $7 million, respectively, are included in revenues and expenses for Generation. For the three months ended June 30, 2012 and 2011, utility taxes of $54 million and $57 million, respectively, are included in revenues and expenses for ComEd. For the three months ended June 30, 2012 and 2011, utility taxes of $34 million and $42 million, respectively, are included in revenues and expenses for PECO. For the three months ended June 30, 2012, utility taxes of $19 million are included in revenues and expenses for BGE.

[12]

For the six months ended June 30, 2012 and 2011, utility taxes of $ 32 million and $ 13 million, respectively, are included in revenues and expenses for Generation. For the six months ended June 30, 2012 and 2011, utility taxes of $115 million and $121 million, respectively, are included in revenues and expenses for ComEd. For the six months ended June 30, 2012 and 2011, utility taxes of $68 million and $90 million, respectively, are included in revenues and expenses for PECO. For the period of March 12, 2012 through June 30, 2012, utility taxes of $22 million are included in revenues and expenses for BGE.

[13]

Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.