Stem SPAC Presentation Deck

stem Athena Platform Delivers Resource Adequacy in the California Market AGGREGATE SYSTEM POWER - KW 40,000 30,000 20,000 10,000 0 -10,000 - -20,000 - -30,000 -40,000 -50,000 -60,000 CHARGING FROM GRID DISCHARGING TO GRID 09:00 12:00 15:00 18:00 21:00 Its Electric Grid Under Strain, California Turns to Batteries New York Times "On Friday, Aug. 14, the first day California ordered rolling blackouts, Stem, an energy company based in the San Francisco Bay Area, delivered 50 megawatts — enough to power 20,000 homes from batteries it had installed at businesses, local governments and other customers. " 00:00 03:00 06:00 09:00 12:00 Confidential 19 SK SUSI select Stem Competitive RFP in 2020 to select software provider for 345 MWh 25 Tier 1 commercial and municipal customers in Los Angeles and Southern California Edison service territory Stem beat 10 bidders, including energy services firms, based on Athena's advanced Al capability, demonstrated record of success and world-class management team as key differentiators SK E&S SUSI PARTNERS SUSTAINABLE INVESTMENTS

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