Proterra SPAC Presentation Deck

INTRODUCTION ArcLight Clean Transition Corp. Overview Positioned to Help Proterra Accelerate Commercial Vehicle Electrification Top-Tier Leadership January 2021 Daniel Revers Chairman and Founder, ArcLight Capital Partners Arno Harris Director Audrey Lee Director Steven Berkenfeld Director Brian Goncher Director ARCLIGHT John Hancock MOTORS AMS Azure Power CLEAN ENERGY for BIDEN CLEAN ENERGY for BIDEN 党心中 GRIDWORKS Deloitte. RECURRENT ENERGY sunrun BARCLAYS Brightcore Svante ZincFive M POWERHOUSE Silicon Valley Forum PROTERRA ArcLight Clean Transition Corp. Overview ArcLight Clean Transition Corp. is a SPAC listed on the Nasdaq Capital Market that priced its IPO on September 22, 2020 ArcLight management team and board of directors bring significant experience in: ✓ Transportation logistics ✓ Renewable infrastructure ✓ Power networks ✓ Batteries ✓ Electric vehicles Sponsored by an affiliate of ArcLight Capital Partners, a leading private equity firm focused on power and energy infrastructure, and partnered with CAMS, a leading provider of operational and asset management services for infrastructure assets ArcLight's Due Diligence on Proterra ArcLight Clean Transition Corp. due diligence on Proterra includes: ✓ In-depth strategy reviews of the company's strategy across each business unit ✓ Discussions with key customers ✓ Multiple site visits to the Burlingame and Los Angeles factories Independent view of Proterra's battery technology by The Battery Lab 6

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