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TEP Rate Case Filing Test Year Summary of TEP Rate Case Applications 2017 General Rate Approved Application 2019 Rate Case Requested Application June 30, 2015 December 31, 2018 New Rates Effective February 2017 May 1, 2020 Rate Base US$2.0B US$2.7B Non-Fuel Rate Increase US$81M US$115M (1) Equity/Debt 50%/50% 53%/47% ROE 9.75% 10.35% (1) Non-fuel rate increase is offset by a US$39M reduction in fuel costs equating to a net US$76M total revenue request. FORTIS.INC 2018 Test Year Annual Customer Rate Increases Below Inflation Rate Over Past 10 Years 18

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