Advent SPAC Presentation Deck

Detailed Use of Proceeds Product Development Plan Program (1) New Production Equipment & Warehousing US facility expansion Advanced DOE MEA Cost Current MEA MEA for flight MEA assembly automation Aeronautical Stacks Robotic Stack Assembly System Assembly Line Printable electronics Total 7 (1) Includes opex for product development plan. 1000 Total (2021-2025) $52.7m $8.9m $8.0m $0.7m $1.0m $12.2 $10.3 $9.8m $42.8m $7.0m $153.4m Use of proceeds geared towards Advent's development program resulting in top-line growth G&A, Working Capital & Other (2021-2022), $19.0m Business Development & Marketing (2021- 2022), $8.4m Investment in Manufacturing 2021-2023, $10.6m Near-term Funding Requirements ($88.5m) www.advent.energy Product Development 2021- 2023 Capex, $23.0m Product Development 2021- 2023 Opex (Headcount), $27.5m AMCI ADVENT Acquisition Corp. 31

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