Investor Presentation - September 2021

Missouri regulatory clarity Legislation enacted during 2020 clarifies ISRS eligibility All appeals of prior ISRS cases decided - No impact on collections going forward One-time $15M refund in Aug. 2020 Both 2020 ISRS requests approved, adding $18M in annualized revenues Total run-rate revenues now $47.3M (Millions) July 2019 27 Spire | Investor presentation - September 2021 ISRS revenues Filed date Effective date Annualized FY20 June 2018 10/08/18 $ 8.0 $ 8.0 January 2019 05/25/19 12.4 12.4 11/16/19 8.8 7.3 February 2020 05/25/20 11.1 3.7 August 2020 Total 11/28/20 7.0 $ 47.3 $ 31.4

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