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The following table presents EMCOR’s revenues by operating segment and the approximate percentage of total revenues for the years ended December 31, 2001, 2000 and 1999 (in millions, except for percentages): 

## Revenues: 

United States electrical construction and facilities services United States mechanical construction and facilities services United States other services Total United States operations Canada construction and facilities services United Kingdom construction and facilities services Other international construction and facilities services Total worldwide operations 

Revenues for EMCOR’s United States electrical construction and facilities services segment for 2001 decreased by $16.0 million, or 1.2%, compared to 2000. The decrease in revenues was due to reduced levels of fast-track data center and commercial construction in the New York, Chicago, Washington, D.C. and California markets, as well as reduced levels of activity in the Las Vegas and Ohio markets. The decrease was partially offset by increases in revenues associated with energy generation and transportation infrastructure construction markets on the west and east coasts and increased revenues from various activities in the Salt Lake City market. The $357.6 million, or 36.0%, increase in 2000 revenues compared to 1999 was attributable to both new construction and renovation and retrofit jobs for commercial construction and the communication infrastructure and technology markets. Partially offsetting this overall increase was a decrease in new construction revenues from casino work, although this was partially offset by increased renovation and retrofit work at casinos. Additionally, industrial construction-related renovation and retrofit revenues decreased principally due to industrial facilities not having as many shutdowns in production to perform major maintenance during 2000. 

United States mechanical construction and facilities services revenues decreased $60.0 million, or 4.8%. The decrease in revenues was due to reduced levels of fast- track data center construction, reduced levels of activity in the Las Vegas and Denver markets and planned reductions in operations at EMCOR’s Poole & Kent subsidiary operations in the North and South Carolina markets. The decrease in revenues was partially offset by increased revenues associated with energy generation construction on the west and east coasts and increased revenues from the Boston area market. A $195.0 million, or 18.3%, increase in revenues for 2000 compared to 1999 was primarily attributable to revenue growth from EMCOR’s 

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operations excluding acquisitions. Eastern and Western United States based operations were the major contributors to the increase in revenues due to the continued strong renovation market and new construction market in New York City, Houston, Connecticut, Denver and California. Revenues from 1999 acquisitions contributed approximately $77.5 million of the increase. 

United States other services revenues, which include those operations which principally provide energy consulting, maintenance, office and facility management, and central energy system monitoring services increased by $45.8 million, or 27.9%, for 2001 compared to 2000. The increase in revenues was primarily attributable to an increase in building maintenance services provided to customers. Revenues for 2000 increased by $81.1 million compared to 1999. The primary source of the increase in 2000 was revenues of $68.6 million from BTENA and companies acquired during 1999, as well as increases from other United States operations. 

Revenues of Canada construction and facilities services decreased by $38.8 million, or 16.4%, for 2001 as compared to 2000 revenues. The decrease in revenues was primarily attributable to project start date delays in Eastern Canada and a reduction of revenues in Western Canada due to timing of anticipated projects. The $40.3 million, or 20.5%, increase in revenues for 2000 compared with 1999 was attributable to an increased level of activities in Eastern Canada, especially in the second half of 2000. 

United Kingdom construction and facilities services revenues increased $17.4 million, or 3.9%, for 2001 compared to 2000 revenues principally due to continued growth in construction and facilities markets in the United Kingdom during the first half of 2001. The $107.5 million, or 19.4%, decrease in 2000 revenues compared with 1999 

