South African electricity supply industry / future SAWEM

South Africa. Status: pre launch.

Wholesale design: The current system remains dominated by regulated dispatch, single-buyer procurement and bilateral wheeling. The South African Wholesale Electricity Market code and roadmap are under implementation; this record does not treat SAWEM as an already-operational spot market.

Operator
National Transmission Company South Africa (NTCSA)
Nominal frequency
50 Hz
What a battery can sell

What ancillary services can a battery sell in South African electricity supply industry / future SAWEM?

South African electricity supply industry / future SAWEM has 8 ancillary-service products, across 6 families — regulation, frequency containment, contingency reserve, replacement reserve, reactive power & voltage and black start & restoration: Black Start / Self Start / Unit Islanding, Emergency Reserve, Instantaneous Reserve, Regulating Reserve Down, Regulating Reserve Up, Supplemental Reserve, Ten-Minute Reserve, Reactive Power / Voltage Control. Response timing, direction and eligibility for each are in the cards below, as the official sources state them.

Facts below are stated as the official sources state them. A missing line means the source does not state that value — never that the value is zero.

Regulation

  • Regulating Reserve Down

    operational

    Correct frequency and tie-line deviations under automatic control.

    Direction
    down
    Response starts
    within 10 s
    Full activation
    10 min
    Sustain
    Continuous regulation subject to resource limits
    Trigger / range
    System-control signal.
    Eligibility
    Qualified generation and demand-side resources.
    Typical procurement
    830 MW (2026/27)
    Pricing
    Ancillary-service contract/regulated provision

  • Regulating Reserve Up

    operational

    Correct frequency and tie-line deviations under automatic control.

    Direction
    up
    Response starts
    within 10 s
    Full activation
    10 min
    Sustain
    Continuous regulation subject to resource limits
    Trigger / range
    System-control signal.
    Eligibility
    Qualified generation and demand-side resources.
    Typical procurement
    830 MW (2026/27)
    Pricing
    Ancillary-service contract/regulated provision

Frequency containment

  • Instantaneous Reserve

    operational

    Arrest rapid frequency decay following a contingency using generation or demand reduction.

    Direction
    up
    Full activation
    10 s
    Sustain
    at least 10 min; At least 10 minutes
    Trigger / range
    Frequency event; generator high-frequency response setting is above 50.15 Hz. Demand-response settings are contracted and tested.
    Eligibility
    Qualified generating units and contracted demand-response loads; demand-response minimum offer 10 MW.
    Typical procurement
    650–850 MW (2026/27)
    Pricing
    Contract terms; instantaneous demand response receives standby payment rather than energy payment

Contingency reserve

  • Emergency Reserve

    operational

    Provide additional response for severe contingencies and emergency operating states.

    Direction
    up
    Full activation
    10 min
    Trigger / range
    Emergency operating instruction/event.
    Eligibility
    Qualified generation and demand-side resources.
    Typical procurement
    1200 MW (2026/27)
    Pricing
    Ancillary-service contract/regulated provision

  • Ten-Minute Reserve

    operational

    Restore instantaneous and regulating reserves following a contingency.

    Direction
    up
    Full activation
    10 min
    Trigger / range
    System-operator dispatch following contingency or reserve depletion.
    Eligibility
    Qualified synchronized and non-synchronized resources.
    Typical procurement
    520–720 MW (2026/27)
    Pricing
    Ancillary-service contract/regulated provision

Replacement reserve

  • Supplemental Reserve

    operational

    Replace depleted reserves and support longer-duration shortages.

    Direction
    up
    Full activation
    6 h
    Sustain
    at least 2 h; Available for at least 2 hours
    Trigger / range
    System-operator instruction.
    Eligibility
    Qualified generation and demand-side resources.
    Typical procurement
    400 MW (2026/27)
    Pricing
    Ancillary-service contract/regulated provision

Reactive power & voltage

  • Reactive Power / Voltage Control

    operational

    Maintain voltages and reactive-power margins across the transmission system.

    Direction
    non-directional
    Stated response
    Equipment- and instruction-specific
    Sustain
    Continuous/as required
    Trigger / range
    Voltage-control setpoints and system-operator instruction.
    Eligibility
    Qualified generators and reactive compensation resources.
    Typical procurement
    Network-study-specific
    Pricing
    Regulated/contractual

Black start & restoration

  • Black Start / Self Start / Unit Islanding

    operational

    Restore the power system after a blackout through self-starting and islanding-capable resources.

    Stated response
    Facility- and restoration-plan-specific
    Sustain
    Restoration-plan-specific
    Trigger / range
    Restoration plan.
    Eligibility
    Certified self-start and islanding-capable units.
    Typical procurement
    Restoration-plan-specific
    Pricing
    Ancillary-service contract
Getting paid to exist

Does South African electricity supply industry / future SAWEM have a capacity mechanism?

No. South African electricity supply industry / future SAWEM's capacity/adequacy arrangement: No operational market-wide capacity mechanism. Responsibility sits with Department of Electricity and Energy / NTCSA / NERSA.

No operational market-wide capacity mechanism

not operational

Adequacy is currently addressed through central planning, regulated procurement and bilateral/IPP programmes. The future SAWEM design should not be represented as an already-operational capacity market.

other

Responsibility
Department of Electricity and Energy / NTCSA / NERSA
Auction held in 2025
No — No capacity auction for this market was found to have been held during 2025 in the sources reviewed.
Where this comes from

Official sources

Rules

Service specification

Market explainer

Current as of · from the Global Electricity Market Catalogue v1.2.0 (compiled to , CC BY 4.0). Facts belong to the linked official authorities; verify the current rules before design or bidding decisions.

Questions

Common questions about South African electricity supply industry / future SAWEM

Who operates South African electricity supply industry / future SAWEM?
National Transmission Company South Africa (NTCSA) operates South African electricity supply industry / future SAWEM, covering South Africa.
Was a qualifying capacity event held in South African electricity supply industry / future SAWEM in 2025?
No. No operational market-wide capacity mechanism: no qualifying 2025 event is recorded. No capacity auction for this market was found to have been held during 2025 in the sources reviewed.
How is energy traded, priced and settled in South African electricity supply industry / future SAWEM?
South African electricity supply industry / future SAWEM: The current system remains dominated by regulated dispatch, single-buyer procurement and bilateral wheeling. The South African Wholesale Electricity Market code and roadmap are under implementation; this record does not treat SAWEM as an already-operational spot market.
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