Reliability of Supply

    How often supply is interrupted, and for how long: the international reliability indices, region by region.

    We are dedicated to enhancing the reliability of power supply and minimising power interruptions. This commitment is supported by the continuous monitoring of the SAIDI, SAIFI and CAIDI indices, aligned with best international practice. The figures for 2020–2025 reflect ongoing efforts to maintain and improve service reliability. 2025 figures: CEB Annual Report 2024/2025.

    SAIDISystem Average Interruption Duration Index

    The average total time without electricity per customer in a year (hours). Lower is better.

    SAIFISystem Average Interruption Frequency Index

    The average number of interruptions a customer has in a year. Lower is better.

    CAIDICustomer Average Interruption Duration Index

    How long an interruption lasts on average (hours) = SAIDI ÷ SAIFI. Lower is better.

    SAIDI: hours without supply per customer per year

    NorthCentreSouth
    hours012345202020212022202320242025● Centre 3.95● South 3.84● North 2.89
    View the figures (hours)
    Region202020212022202320242025
    North2.584.053.162.943.322.89
    Centre2.492.382.623.714.253.95
    South3.312.913.293.384.443.84

    SAIFI: interruptions per customer per year

    NorthCentreSouth
    interruptions0123202020212022202320242025● Centre 2.40● South 1.19● North 1.02
    View the figures (interruptions per year)
    Region202020212022202320242025
    North1.331.711.291.191.031.02
    Centre1.481.621.622.062.352.40
    South2.362.352.561.632.031.19

    CAIDI: average length of an interruption

    NorthCentreSouth
    hours01234202020212022202320242025● South 3.23● North 2.85● Centre 1.65
    View the figures (hours)
    Region202020212022202320242025
    North1.942.372.452.463.222.85
    Centre1.681.471.621.801.811.65
    South1.411.241.292.072.193.23

    Port Louis region

    Indices for the Port Louis region only, 2017 to 2022.

    SAIDI hours per customer per year
    hours per customer per year0123201720182019202020212022
    SAIFI interruptions per year
    interruptions per year00.250.50.7511.25201720182019202020212022
    CAIDI hours
    hours01234201720182019202020212022
    View the figures
    Index201720182019202020212022
    SAIDI (hours/customer/year)1.611.611.111.512.402.49
    SAIFI (interruptions/year)0.650.850.530.540.961.00
    CAIDI (hours)2.481.892.102.792.502.49