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Operational Efficiency

Exelon operates facilities from high-rise office buildings in major cities to service centers in local communities and power plants in rural areas. To directly demonstrate the feasibility and economic benefits of sustainability in business, we are working to be an example for efficient operations and sustainable business standards.

Exelon's Climate Change Response in Action

Making our operations more efficient is one element of our three-pronged strategy to reduce our carbon footprint.

Exelon Achieves the Energy Reduction Challenge

In 2007, Exelon introduced the “Energy Reduction Challenge” to reduce purchased energy consumption at our buildings and auxiliary power at our plants and are proud to have exceeded both of our goals.

We reduced internal energy usage through equipment retrofit programs involving more efficient electrical equipment, HVAC and building management control systems.  In addition to reducing GHG emissions, this program is estimated to avoid annual operating costs for electric and natural gas equivalent to $3 million to $4 million each year. And these efforts continue as indicated in our Corporate Sustainability Report.

Engaging Employees
Exelon’s Eco-Team of employees is a grassroots catalyst for sustained, carbon-reducing behavioral change at Exelon and in our communities.  Through fun challenges and volunteer activities, they promote, support and drive implementation of workplace and lifestyle solutions that are environmentally responsible and cost-effective.
Exelon Eco-Team
PECO Crown Lights

PECO's Crown Lights

The PECO Crown Lights atop the Main Office Building headquarters were updated with the installation of 2 million energy-efficient LEDs (light-emitting diodes) with color capacity--a 40% energy savings.   Renovations continue throughout this 26 story building targeting LEED-EB certification in 2015.

Focusing on our Buildings

Exelon plans for its new Baltimore headquarters facility to be built to LEED standards. Exelon plans for its new Baltimore headquarters facility to be built to LEED standards.  Exelon has used the LEED guidelines and certification process as one way to reduce energy consumption in our commercial buildings.  We currently have 16 LEED-certified buildings.  In addition, many other buildings have been or are in the process of being renovated and upgraded in accordance with LEED standards. For example, BGE recently opened a state-of-the art learning and service center for its electric and gas system employees and is expected to meet LEED standards. The building is equipped with 728 solar panels that provide approximately 25% of the facility’s electric supply.  This adaptive reuse project on 19 acres of land includes a preexisting 53,000 square-foot building with office, classroom, laboratory and warehouse space as well as outdoor areas for field training exercises.  In addition, ComEd completed a new call center and new training center in Rockford, Illinois, which were LEED certified.

Exelon's LEED-Certified Buildings

Facility Certification Size

Corporate Headquarters

LEED-Commercial Interior (CI)      
247,000 sq ft   

Chicago City Solar
Reception Building

LEED-New Construction (NC) Silver 1,009 sq ft

Clinton Power Station
Administration Building


Conowingo Hydroelectric Plant              
Visitor Center

LEED-Existing Building (EB) 
4,864 sq ft
ComEd Rockford Training Center     LEED-Silver
ComEd Lincoln Center Two (floors 2-6) LEED-Silver

Fairless Hills Renewable Energy
Education Center

3,970 sq ft

PECO Baldwin Building

LEED-EBOM v2009 
48,203 sq ft

PECO Berwyn Campus
1040 Building


21,360 sq ft

PECO Berwyn Campus
1050 Building


94,463 sq ft

PECO Berwyn Campus
1060 Building


84,940 sq ft

PECO Christian Street
Service Building

LEED-EBOM v2009 
82,193 sq ft

PECO G & Luzerne
Service Building

LEED-EBOM v2009 
18,195 sq ft

PECO Phoenixville
Service Building


21,669 sq ft

PECO Warminster
Service Building


97,251 sq ft

PECO West Chester
Service Building

4,950 sq ft


Reducing Emissions from our Vehicle Fleet

An important part of greening our operations involves reducing GHG emissions from our vehicle fleet. All Exelon companies actively promote no idling and fuel reduction campaigns, as well as use biodiesel as a primary vehicle fuel.

Nearly half of our vehicle fleet is comprised of alternative-fuel and hybrid vehicles.  Exelon's utility companies, BGE, PECO and ComEd, have the largest vehicle fleets among the Exelon family of companies.  Each has a program to continually reduce their GHG emissions and ensure compliance with federal and state requirements for alternative fuel vehicles. This has been accomplished through upgrades to alternative fuel vehicles and increased use of biofuels.

Transmission and Distribution Systems

Exelon continues to make emissions reductions in its transmission and distribution infrastructure. SF6 Detection Photo BGE, ComEd and PECO continue to replace aging circuit breakers and purchased state-of-the-art leak detection cameras to help reduce SF6.
SF6 Reductions.  Sulfur hexafluoride (SF6) is a highly effective insulator used in high-voltage equipment, but it has a GHG impact 23,900 times greater than CO2 if released to the atmosphere.  Exelon’s year-over-year SF6 emissions reductions continued to reflect the strength and focus of our utilities' programs.

Methane Reductions.  Natural gas is comprised almost entirely of methane gas, which has a global warming potential 21 times that of CO2.  Both BGE and PECO participate in the EPA’s Natural Gas Star program and work to repair and pro-actively upgrade their system to ensure and improve operations. Converting from cast iron piping to plastic can reduce methane emissions by 95%, and helps to make important emissions reductions from its distribution system. 

Transmission & Distribution (T&D) Line Losses.  As part of its transition to the TCR protocol, Exelon began accounting for indirect GHG emissions associated with utility-owned transmission and distribution (T&D) line losses. With our investments in Smart Grid technology and other infrastructure improvements, we continue to look for opportunities to improve distribution efficiency.    

Greening our Supply Chain

Exelon is working to reduce the environmental impacts of the materials and services we procure, and to encourage the environmental performance of our suppliers.

Environmental Questionnaire. Prospective vendors must now complete an environmental questionnaire as part of doing business with Exelon.  We are also developing a number of environmental standards to be incorporated into our business processes, including standards for transformers, wire and cable, wood poles and the vehicle fleet.

Green Supplier Network.  In conjunction with the EPA, we are conducting select Green Supplier Network reviews to assess sustainability opportunities in our suppliers’ manufacturing facilities.

Electric Utility Industry Sustainable Supply Chain Alliance (  As one of the founders of the Alliance, Exelon has become a national leader in supply chain environmental management. We helped lead the development of industry standards for evaluating the environmental attributes of key materials and services as well as performance metrics for supplier companies.

Corporate Sustainability Report
Download [PDF | 5MB]
Green Operations