Proterra SPAC Presentation Deck

INDEX Index of Source Page 11 2. Based on $225Bn Global Commercial Vehicle Market and $37Bn Global Commercial Vehicle Charging Investment (see page 16 notes) 3. Source: BloombergNEF "Battery Pack Prices Fall As Market Ramps Up With Market Average At $156/kWh In 2019" (December 2019); The percentage decline discussed in this footnote is expressed in real dollars Source: Goldman Sachs "Outlook for Alternative Powertrain Technologies in Global Truck Markets" (October 2020) Source: California Air Resources Board "15 states and the District of Columbia join forces to accelerate bus and truck electrification" (July 2020 Press Release) Page 12 4. 5. 2. 1. Source: Goldman Sachs "Outlook for Alternative Powertrain Technologies in Global Truck Markets" (October 2020) Source: BloombergNEF "Battery Pack Prices Fall As Market Ramps Up With Market Average At $156/kWh In 2019" (December 2019); The percentage decline discussed in this footnote is expressed in real dollars 3. Source: California Air Resources Board "15 states and the District of Columbia join forces to accelerate bus and truck electrification" (July 2020 Press Release) Page 16 1. Total Addressable Market is based on management estimates of the assumed price of an electric powertrain, and the number of vehicles per the following sources: LMC, "Global Commercial Vehicle Forecast World Query - MHCV", Q3 2020; Freedonia, "Global Buses Industry Study 6th Edition", June 2019; Frost & Sullivan, "Global Electric Bus Market Opportunity Analysis, 2017- 2025", December 2018; Frost & Sullivan, "Global Earth Moving, Construction and Mining Equipment Market, Forecast to 2026", December 2017. Bloomberg NEF, "Charging Infrastructure Forecast Model (CIFM)", August 27, 2020. Estimates in 2023 are based on battery and drivetrain for all segments except North American transit, which includes assumed vehicle price 2. Source: BloombergNEF "Electric Vehicle Outlook 2020" Charging Infrastructure Forecast Model (August 2020) Page 21 2. Source: Propane Education & Resource Council's Chief Business Development Officer Tucker Perkins quoted in LPGas Magazine "Industry Partners in place for propane to penetrate step-van market" (October 2014) Source: American School Bus Council (December 2020) 3. April 8, 2021 Page 26 1. Source: Transit (U.S. Department of Energy's Energy Efficiency & Renewable Energy: Alternative Fuels Data Center), school bus (U.S. Department of Energy's Energy Efficiency & Renewable Energy: Alternative Fuels Data Center and the Environmental Defense Fund), coach bus (United Motor Coach Association), European bus (NEA Transport Research and Training), European medium-duty trucks (Roland Berger's "Trends in the Truck & Trailer Market (August 2018)), Straight Class 8 trucks (U.S. Department of Energy's Energy Efficiency & Renewable Energy: Alternative Fuels Data Center, U.S. Census Bureau, and Arizona State University's "Compressed Natural Gas as a Fuel for Concrete Mixer Trucks: The Business Case"), cutaway chassis (U.S. Department of Energy's Energy Efficiency & Renewable Energy: Alternative Fuels Data Center), and North American medium-duty trucks (U.S. Department of Energy's Energy Efficiency & Renewable Energy: Alternative Fuels Data Center and NREL's "Thirty-Six Month Evaluation of UPS Diesel Hybrid-Electric Delivery Vans"). Page 32 1. Source: Bloomberg NEF "Electric Vehicle Outlook 2020" Charging Infrastructure Forecast Model (August 2020) PROTERRA 2. 3. Source: FleetOwner "FleetOwner 500 Top Private Fleets" (April 15, 2019) Source: US. Department of Transportation Federal Highway Administration, Office of Freight Management and Operations "Jason's Law Truck Parking Survey Results and Comparative Analysis" (April 2015) Source: Wonder "US Warehouses and Distribution Hubs" (March 14, 2020) 4. Page 39 1. 2. Source: Frost & Sullivan "Global Electric Bus Market Opportunity Analysis, 2017-2025" (December 2018) Source: California Air Resources Board "California transitioning to all-electric public bus fleet by 2040" (December 14, 2018), the City of Chicago Resolution R2019-157, King County, "Metro is transitioning to a zero-emissions bus fleet" (August 2019), Miami-Dade County Board of County Commissioners Resolution R- 1034-18, Minnesota Metropolitan Council Transportation Committee "Bus Fleet Strategy" (December 10, 2018). Coalition for Clean Transportation, MTA 2020-2024 MTA Capital Program (September 2019), Toronto Transit Commission "TTC Green Initiatives" (December 2020), and Yale Environment 360, Yale School of the Environment (December 14, 2018) 3. 4. Source: NFI Group Company Materials (3Q 2020); represents NFI Group's North America transit bus active bid universe Source: Total North American Bus Fleet size reached through the addition of the United States total bus fleet size of 66,116 (American Public Transportation Association "2019 Public Transportation Fact Book," (2019)) to the Canadian total bus fleet size of 18,604 (Motor Carrier Passenger Council of Canada, "Labor Market Report 2019: Business and Financial" (2019) Page 40 1. Source: Federal Transit Administration's 2019 Annual Database Revenue Vehicle Inventory; share of electric buses 235-ft 66

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