Commonwealth Edison 8-K Regulation FD Disclosure

1

ComEd Delivery Service

Rate Case Filing

$361

(6)

Total ($2,049 million revenue requirement)

$(51)

Other adjustments

(5)

$48

O&M expenses

$99

Administrative & General expenses

(4)

$50

Capital Structure

(3)

: ROE -

10.75% /

Common Equity -

45.11% / ROR -

8.55%

$215

(2)

Rate Base: $7,071 million

(1)

Requested Revenue

Requirement Increase

($ in millions)

Revenue increase needed to recover significant distribution system investment and

represents an important step in ComEd’s regulatory recovery plan

(1) Based on 2006 test year, including pro forma capital additions through 3Q 2008; represents a $1,550 million increase from 2006 ICC order

(2) Includes increased depreciation expense associated with capital additions

(3) Requested cap structure does not include goodwill; ICC docket 05-0597 allowed 10.045% ROE, 42.86% equity ratio and 8.01% ROR (return

on rate base)

(4) Includes increases in pension and other post-retirement benefits costs and effects of accounting reclassification for rental revenue

(5) Includes taxes other than income, regulatory expenses, and reductions for other revenues and load growth

(6) Or approximately $359 million adjusted for normal weather

Exhibit 99.1

2

ComEd Delivery Service

Rate Case Filing –

Tentative Schedule

Filed –

October 17, 2007

Rebuttal Testimony –

February 2008

Hearings –

May 2008

Administrative Law Judge (ALJ) Order –

July 2008

Final Order Expected –

September 2008

Note:

Dates

are

based

on

typical

approach

to

rate

cases

but

the

Illinois

Commerce

Commission

will

set

the

actual schedule.