Advent SPAC Presentation Deck

World-Class Customer Base UltraCell HIGH POWER MICRO FUEL CELLS A Bren-Tronics Company Portable Power California-based developer of fuel-flexible fuel cells for mobile, portable power solutions Supplier to the U.S., U.K. and other armies Advent supplies MEAS SIOENS Off-Grid Award-winning Munich-based fuel cell manufacturer. Recently secured EU Horizon 2020 funding approval Siqens has developed the Ecoport 800 HT- PEM fuel cell for off-grid applications using methanol as the hydrogen carrier Advent supplies MEAS ESSINC CATALYZING A CLEANER FUTURE Energy Storage Oregon iron flow battery for off-grid and utility systems Backed by established cleantech investors including Breakthrough Energy & BASF Ventures Advent supplies component of ESS's iron flow battery EW Proven technology with products already in market SSAFRAN Aviation International high- technology group with 84,000 employees worldwide; operates in aviation, defense and space markets Advent supplies MEAs and collaborates on innovation NASA TE www.advent.energy Silicon Valley- based loT Innovator Gas Sensors Develops specialized sensors Multi-year collaboration with significant commercial potential Advent supplies core component 28 !!! 12 58*** Palcan Off-Grid Vancouver- based developer of fuel cells for the Chinese market Applications in automotive, stationary, off-grid markets Advent supplies key component Nice MEOH FOR FCUK NISSAN Auto Japanese multinational automotive manufacturer Applications in fuel cell vehicles Advent MEAS are tested for next generation vehicles fuelcellenergy Power Generation FuelCell Energy, Inc. (NASDAQ: FCEL) is a global leader in delivering clean, efficient, and affordable fuel cell solutions configured for the supply, recovery, and storage of energy Advent supplies MEAS for tri- generation systems AMCI ADVENT Acquisition Corp. 15

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