1. The information contained herein is confidential in nature and considered proprietary to WESCO Distribution, Inc. It is intended for the exclusive use of the employees, contractors and agents of client companies. We request that no oral or written disclosure of such information be made without the prior written approval by WESCO Distribution, Inc. Strategies for Success, Challenges, and Opportunities Billy Grayson, Director, Corporate Sustainability June, 2012 WESCO and the Pittsburgh Green Workplace Challenge

2. 2 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW Agenda WESCO Profile Sustainability at WESCO GWC Accomplishments and Success Challenges (and strategies to overcome them.)

3. 3 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW WESCO Profile Fortune 500 Company (NYSE: WCC) − Headquartered in Pittsburgh, PA − Approximately 7,300 employees − Approximately 400 locations in 14 countries A leading provider of electrical, industrial, and communications MRO and OEM products, construction materials and advanced supply chain management and logistics services − Serving over 65,000 customers − Partnering with 18,000 suppliers − Over 1 million different products shipped annually International operations and global sourcing capabilities …an industry leader Global Leader of Supply Chain Solutions that consistently delivers Superior Customer Value and Shareholder Returns ----------------- Known for the best customer service and the best people Providing customers the products and supply chain services they need for MRO OEM Capital Projects Customer Value Proposition Vision

4. 4 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW WESCO’s Sustainability Strategy Reduce our impact… − Reduce energy consumption in our buildings − Pursue ENERGY STAR and LEED- certified buildings. − Reduce fleet fuel use − Reduce waste/improve recycling − Improve green procurement and packaging policies − Improve our green communications and help our suppliers to do the same …And help customers reduce their impact − Train WESCO sales staff to help customers understand WESCO’s sustainability solution set − Develop case studies from WESCO projects to show cost-effective energy efficiency and renewable energy opportunities. − Improve sustainability communications through WESCO website and product catalogs − Respond to sustainability questionnaires from customers − Deliver GHG inventory and annual sustainability report. − Speak at and attend key sustainability trade shows and conferences.

5. 5 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW Sustainability progress – 2011-2012 POLICIES AND PLANS − Environmental inventory completed January, 2011 − Sustainability plan finalized in March 2011 − Green building, green lease, and sustainable procurement policies finalized October, 2011 REDUCING OUR IMPACT − Lighting and control upgrades made to 32 branches; reduced energy consumption by 20%/facility; equates to a $350,000 annual electricity costs savings. − On-site renewable energy projects in Honolulu and Phoenix. Green Power Purchase in Gaithersburg − 40% reduction in waste, primarily through aggressive packaging reuse program IMPROVING OUR PRODUCTS − Green Communication Guidance distributed to all suppliers − Solar Guide published Summer 2011 − Wesco.com/sustainability launched November 2011 − MaxCell: completes greenhouse gas lifecycle analysis, earns Carbon Trust label SUPPORTING OUR CUSTOMERS − Responded to 32 customer questionnaires, 18 RFPs with sustainability reporting and product solutions − Increased “sustainability business” in 2011 – renewables and LED lighting grew 150% − Driving reductions – WESCO products reduced customer GHG emissions by an estimated 150,000 metric tons

6. 6 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW WESCO Sustainability – Supporting our Customers “Walk the Talk”: branches become showrooms for WESCO technology, signage, case studies, and sales trainings complement energy-saving investments. Sustainability strategy and technical support: WESCO offers energy opportunity assessments, lighting design, commissioning, and power management strategy support. Sustainability-related products: Three sustainability catalogs, along with product case studies and testimonials. Sustainability and Value Creation: Supporting WESCO’s largest clients with hands-on technical support, guaranteed energy and cost savings, and long-term sustainability strategy.

7. 7 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW WESCO and the GWC - success Energy and water tracking. − New Ecova system helps drive ENERGY STAR benchmarking. − Metering + estimation helps WESCO Pittsburgh understand its impact. Establishing formal environmental policies improves consistency in procurement, recycling, IT. Employee engagement events build awareness, launch “green teams.” Energy audits uncover opportunities, lead to proposals (Warrendale) and action (Pittsburgh)

8. 8 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW GWC challenges WESCO Pittsburgh – a fully-serviced lease makes the following a challenge: − Calculating our baseline environmental performance − payback for sustainability investments WESCO Warrendale – suburban campus makes travel-related items a challenge. WESCO facilities looking to overcome these challenges by: − Voluntary mapping of commutes to present carpool options − Using meters and estimates to refine baselines and model savings − Continuing to identify opportunities through system commissioning − Working with our landlord on “win-win” solutions that will help the whole building be more sustainable

9. 9 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW Thanks! Billy Grayson Director, Corporate Sustainability 412-454-2424 (w) 202-427-3094 (cell) bgrayson@wesco.com More on WESCO’s Sustainability Initiative is available at www.wesco.com/sustainability. www.wesco.com/sustainability

10. 10 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW WESCO’s Environmental Footprint ENVIRONMENTAL FOOTPRINT Greenhouse gas emissions: 47,484 metric tons, down 3.6% from 2010. Building energy intensity: 44,150 BTU/sqft, down 2.3% from 2010. Building electricity consumption: 5.95 kWh/sqft, down 6.1% from 2010. Waste generation: 8,156 tons, down 11% from 2010 and down 40% from 2009. Fleet Fuel use: 985,604 gallons, down 1.7% from 2010 and down 5% from 2009. CORPORATE FOOTPRINT Building square footage: 9.4 million sqft, up 4.4% from 2010. # vehicles: 557, down 2% from 2010 and down 4% from 2009 Total revenues: $6.13 billion, up 21% from 2010 and up 30.5% from 2009. Energy and environmental costs: $11.7 million, up 6.2% from 2010.

11. 11 WESCO Confidential—Do not copy or distribute without express permission from WESCO Distribution, Inc. OVERVIEW LEED Charlotte Achieved LEED Gold certification in 2011 Generated strong local press accolades Strengthened WESCO sustainability relationships with Cooper, Hubbell, Philips. Helped make WESCO Charlotte Open house one of the greenest and most successful events of 2011 Helped inform future sustainability improvements across WESCO’s facilities