| Regulation |
| Regulating Lower Service LREG lower generation; raise load operational | Response type pre-fault centrally controlled AGC Trigger AEMO AGC Lower Signals; not a fixed public frequency threshold. | Full activation 5 min | | As stated Requirements vary by interval and region; no stable official typical range is prescribed. Requirements vary by interval and region; no stable official typical range is prescribed. Through security-constrained co-optimised FCAS spot market Bought daily bids with five-minute dispatch and rebidding How it settles Five-minute regional FCAS clearing price for enabled MW, with frequency-performance-payment arrangements under the current settlement guide. |
Full record for Regulating Lower Service — document bound, page for these figures not recorded What it is for Support control of system frequency and accumulated time error for ordinary supply-demand variations within a trading interval. In force from 3 June 2024 Who can provide it AEMO-registered and enabled FCAS facilities meeting MASS, telemetry, control and minimum-offer requirements. Notes from the source MASS defines the offered quantity as response delivered progressively over the five-minute trading interval; AGC requests may change during that interval, so there is no separate fixed hold duration. Checkpoint recap Full activation 5 min What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Regulating Raise Service RREG raise generation; lower load operational | Response type pre-fault centrally controlled AGC Trigger AEMO AGC Raise Signals; not a fixed public frequency threshold. | Full activation 5 min | | As stated Requirements vary by interval and region; no stable official typical range is prescribed. Requirements vary by interval and region; no stable official typical range is prescribed. Through security-constrained co-optimised FCAS spot market Bought daily bids with five-minute dispatch and rebidding How it settles Five-minute regional FCAS clearing price for enabled MW, with frequency-performance-payment arrangements under the current settlement guide. |
Full record for Regulating Raise Service — document bound, page for these figures not recorded What it is for Support control of system frequency and accumulated time error for ordinary supply-demand variations within a trading interval. In force from 3 June 2024 Who can provide it AEMO-registered and enabled FCAS facilities meeting MASS, telemetry, control and minimum-offer requirements. Notes from the source MASS defines the offered quantity as response delivered progressively over the five-minute trading interval; AGC requests may change during that interval, so this is not a step-response guarantee and there is no separate fixed hold duration. Checkpoint recap Full activation 5 min What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Fast frequency response |
| Very Fast Lower FCAS L1 lower generation; raise load operational | Response type post-fault automatic local frequency Trigger Enabled resource responds automatically when local frequency moves outside the normal operating frequency band; the MASS uses a verification ramp rather than one universal relay setting. | Full activation 1 s | | As stated Dynamic constraint requirements; no stable typical range. Dynamic constraint requirements; no stable typical range. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery is verified under MASS. |
Full record for Very Fast Lower FCAS — document bound, page for these figures not recorded What it is for Arrest an over-frequency excursion in the first second after a contingency and transition to Fast Lower FCAS. In force from 3 June 2024 Who can provide it Registered FCAS facilities capable of automatic local-frequency response and MASS-compliant high-speed metering. Notes from the source Offer measurement uses response from disturbance time to 1 s and transition from 1 s to 6 s; no independent fixed hold duration is specified. Checkpoint recap Full activation 1 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Very Fast Raise FCAS R1 raise generation; lower load operational | Response type post-fault automatic local frequency Trigger Enabled resource responds automatically when local frequency moves outside the normal operating frequency band; the MASS verifies against the applicable frequency ramp, not one universal relay setting. | Full activation 1 s | | Reported, not a current requirement Dynamic constraint requirements; transition caps have changed over time and are not a typical volume. Dynamic constraint requirements; transition caps have changed over time and are not a typical volume. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery is verified under MASS. |
Full record for Very Fast Raise FCAS — document bound, page for these figures not recorded What it is for Arrest an under-frequency excursion in the first second after a contingency and transition to Fast Raise FCAS. In force from 3 June 2024 Who can provide it Registered FCAS facilities capable of automatic local-frequency response and MASS-compliant high-speed metering. Notes from the source Offer measurement uses response from disturbance time to 1 s and transition from 1 s to 6 s; no independent fixed hold duration is specified. Checkpoint recap Full activation 1 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Other services |
| Delayed Lower FCAS L5 lower generation; raise load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency. | Full activation 5 min | Minimum obligation at least 5 min | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Delayed Lower FCAS — document bound, page for these figures not recorded What it is for Return frequency toward 50 Hz within five minutes and sustain response until central dispatch can rebalance the system. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage or responsive load. Notes from the source MASS offer calculation measures the delivered response over 1-5 min and again over 5-10 min; 300 s is the verification sustain window after full response. Checkpoint recap Full activation 5 min · Minimum sustained 5 min What the source does not state The source states the full-activation requirement, a minimum delivery period, and a procurement volume in its own words. It does not state a maximum duration. |
| Delayed Raise FCAS R5 raise generation; lower load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency. | Full activation 5 min | Minimum obligation at least 5 min | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Delayed Raise FCAS — document bound, page for these figures not recorded What it is for Return frequency toward 50 Hz within five minutes and sustain response until central dispatch can rebalance the system. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage or responsive load. Notes from the source MASS offer calculation measures the delivered response over 1-5 min and again over 5-10 min; 300 s is the verification sustain window after full response. Checkpoint recap Full activation 5 min · Minimum sustained 5 min What the source does not state The source states the full-activation requirement, a minimum delivery period, and a procurement volume in its own words. It does not state a maximum duration. |
| Fast Lower FCAS L6 lower generation; raise load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency; provider-specific droop or switching settings apply. | Full activation 6 s | | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Fast Lower FCAS — document bound, page for these figures not recorded What it is for Arrest an over-frequency excursion within six seconds and transition to Slow Lower FCAS. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage, responsive load or aggregated facilities. Notes from the source Measured over 1-6 s and 6-60 s transition windows; no separate fixed hold duration. Checkpoint recap Full activation 6 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Fast Raise FCAS R6 raise generation; lower load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency; provider-specific droop or switching settings apply. | Full activation 6 s | | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Fast Raise FCAS — document bound, page for these figures not recorded What it is for Arrest an under-frequency excursion within six seconds and transition to Slow Raise FCAS. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage, responsive load or aggregated facilities. Notes from the source Measured over 1-6 s and 6-60 s transition windows; no separate fixed hold duration. Checkpoint recap Full activation 6 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Slow Lower FCAS L60 lower generation; raise load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency. | Full activation 60 s | | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Slow Lower FCAS — document bound, page for these figures not recorded What it is for Stabilise over-frequency within 60 seconds and transition to Delayed Lower FCAS. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage or responsive load. Notes from the source Measured over 6-60 s and 60 s-5 min transition windows; no separate fixed hold duration. Checkpoint recap Full activation 60 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |
| Slow Raise FCAS R60 raise generation; lower load operational | Response type post-fault automatic local frequency Trigger Automatic local-frequency response after a contingency. | Full activation 60 s | | As stated Dynamic constraint requirements. Dynamic constraint requirements. Through co-optimised contingency FCAS spot market Bought daily bids with five-minute enablement and rebidding How it settles Five-minute regional enablement price; delivery verified under MASS. |
Full record for Slow Raise FCAS — document bound, page for these figures not recorded What it is for Stabilise under-frequency within 60 seconds and transition to Delayed Raise FCAS. In force from 3 June 2024 Who can provide it Registered MASS-compliant generation, storage or responsive load. Notes from the source Measured over 6-60 s and 60 s-5 min transition windows; no separate fixed hold duration. Checkpoint recap Full activation 60 s What the source does not state The source states the full-activation requirement and a procurement volume in its own words. It does not state how long delivery has to be sustained. |