Allego SPAC Presentation Deck

Transaction Summary Spartan Acquisition Corp. III NYSE: SPAQ Transaction Structure Expected cash proceeds of $702mm: • Spartan Acquisition Corp. III has $552mm of cash held in trust PIPE size of $150mm ● Use of proceeds: 1) investments in prime locations and technology to maintain leadership 2) $556mm cash on balance sheet allego Note: (1) (2) Valuation Enterprise value of $2.65bn at $10 per share Attractive entry value compared to peers¹ • 42% discount based on projected 2025E Operational EBITDA of $377mm Market data as of July 23, 2021. USD/EUR at 1.18. Peers considered are EVgo and ChargePoint. Assuming no Spartan III shareholder redemptions. Net of transaction fees and deferred advisory fees. CONFIDENTIAL allego NYSE Capital Structure Existing Allego shareholders will roll 100% of their equity • $556mm of net cash proceeds² funds capex deployment and IT investment needs for the next 5 years • Projected Operational EBITDA positive in 2021 and cash flow positive in 2026 8

View entire presentation