About Intermittent Generation

Australian Wind Energy The unit must be a generator for the service type: ‘energy’. Loads cannot bid for mandatory restrictions capacity. Forecasting System (AWEFS Australian Wind Energy Forecasting System. Established in response to the growth in intermittent generation in the NEM, and the increasing impact this growth was having on NEM forecasting processes. The system aims to provide better forecasts that will drive improved efficiency of overall NEM dispatch and pricing, and permit better network stability and security management.) and the Australian Solar Energy Forecasting System (ASEFS Australian Solar Energy Forecasting System. Designed to produce solar generation forecasts for large solar power stations and small-scale distributed photovoltaic (PV) systems, covering forecasting timeframes from 5 minutes to 2 years.) were established in response to the growth in intermittent generation and the increasing impact this growth has on the forecasting process.

The Rules The National Gas or Electricity rules. define an intermittent generating unit as a:

Generating unit whose output is not readily predictable, including, without limitation, solar generators, wave turbine generators, wind turbine generators and hydro-generators without any material storage capability.

Clause 2.2.7(a) of the Rules allows a person to classify a group of generating units as a semi-scheduled generating unit (if combined nameplate rating is greater than or equal to 30 MW Megawatt) or otherwise as a non-scheduled generating unit.

Clause 2.2.7(c1) of the Rules allows a unit to be classified as semi-scheduled.

Clause 3.7B(a) of the Rules requires AEMO Australian Energy Market Operator to prepare a forecast of the available capacity of each semi-scheduled generating unit, called its unconstrained intermittent generation forecast (UIGF Unconstrained Intermittent Generation Forecast. A forecast of available capacity for wind and solar generating units for the period five minutes to two years ahead.), for use in dispatch, predispatch, and PASA Projected Assessment of System Adequacy. except executable files e.g., .DLLs, .LIBs and .EXEs with the user mentioned. See National Energy Rules.

The participant provides the available capacity for dispatch using a SCADA Local Limit Same as upper MW limit.. For pre-dispatch and PASA, the participant uses the EMMS Energy Market Management System (formerly MMS); software, hardware, network and related processes. portal to provide the available capacity as an entered Upper MW Limit MW Limit restriction, indicating when a facility is down regulated. An MW limit is applied in the Unit’s control system to limit its MW output to below maximum capacity./Elements Available value. This refers to the provision of technical availability which affects the UIGF in the relevant time frame. Participants updating their energy offer, for example, Max Avail or band capacity, refers to the provision of commercial availability. For more information, see Intermittent Generator Availability.

In this guide, a semi-scheduled generating unit or a non-scheduled generating unit is referred to as Unit A Scheduled, Semi-Scheduled, or Non-Scheduled Generating Unit, Unit ID A semi-scheduled generating unit or a non-scheduled generating unit or DUID Dispatchable Unit Identifier.