Investor Presentation June 2021

Upgrading our infrastructure and reducing methane Estimated replacement miles remaining As of 12/31/20 Vintage Bare steel¹ Cast iron¹ plastic Total replacement miles Missouri 1,5852 553 2,138 Alabama 503 424 271 1,198 Mississippi 438 438 Total 2,526 977 271 3,774 % of total 67% 26% 7% 100% 1Completion expected in 15+ years. 2Includes bare steel mains and services; threaded and coupled steel main. Methane reductions Metric tons/year 22,532 II || Miles of pipeline replaced 400 382 356 359 318 II || 11 II "I || II 16,715 II II || I 2005 2015 || 294 300 12,794 200 9,611 2020 2025* *Value represents a projection based on current efforts. - 24 Spire | Investor presentation June 2021 100 0 2016 2017 2018 2019 2020

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