Stem SPAC Presentation Deck

stem Star Peak Mission & Summary Star Peak overview Magnetar Capital and Triangle Peak Partners Experienced Sponsor with Proven Track Record Mike C. Morgan Chairman • Co-founding partner, Chairman, and CEO of Triangle Peak Partners, LP ● ● Founding team member at Kinder Morgan, Inc. (NYSE: KMI), former President, current Lead Director of KMI Former Lead Director, current Director of Sunnova Energy International (NYSE: NOVA) Co-Chair, Stanford Precourt Institute Energy Advisory Council Successful investment track record (1) >12yrs $6B PARTNERSHIP HISTORY EQUITY CAPITAL COMMITTED (1) Star Peak Energy Transition Corp. as of 9/30/2020. Eric Scheyer CEO Head of Magnetar Energy & Infrastructure Group since its inception in 2005 ● ● ● Member of Magnetar Investment Committee & Management Committee Former Director, Arc Logistics (NYSE: ARCX) 64 PRIVATE INVESTMENTS 48 VENTURE CAPITAL DEALS Star Peak's Climate Focused Mission Backed by Compelling Economics Provide growth capital to a market-leading business focused on climate change initiatives, emissions reductions, and energy efficiency ● RENEWABLES EV Capitalize on scarcity of high quality, public companies with attractive ESG characteristics INFRASTRUCTURE ENERGY STORAGE TECHNOLOGY Confidential ELECTRIC VEHICLES TRANSPORTATION TECHNOLOGY SUPPLY CHAIN & LOGISTICS FOOD TECHNOLOGY LO 5

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