| Week at a glance | Data Source |
| Average price (volume weighted) | Weekly average half hour regional spot price (Tasmania), weighted by demand | NEM-Review™ |
| Median price | The half hour spot price in the middle of the range of prices for the week |
| Average weekly price last year | The weekly average half hour regional spot price in the preceding year, weighted by demand |
| NEM average price | The weekly average half hour spot price of other NEM regions (Victoria, South Australia, New South Wales and Queensland). |
| % of time price <$50/MWh | The proportion of time during the week when the Tasmanian regional half hour spot price was below $50/MWh (low-moderate price). |
| Average price - past four weeks | Chart showing the weekly average (volume weighted) price over the past four weeks |
| Storage | Energy in storage in Hydro Tasmania's catchments (measured in GWh) | Hydro Tasmania |
| Maximum and minimum Demand | The highest and lowest half hour system demand during the week (MW) | NEM-Review™ |
| Average demand | The mathematical average half hour system demand during the week (MW) |
| Weekly energy demand | Sum of weekly half hour demand |
| Basslink export | The amount of energy exported over Basslink during the week (GWh) |
| Basslink import | The amount of energy imported over Basslink during the week (GWh) |
| % time counter price flow | The proportion of time when there was a negative price difference (counter price flow) between Tasmania and Victoria during Basslink flow. |
| Basslink import/export - past four weeks | Chart showing the amount of energy imported/exported over Basslink during the week over the past four weeks |
| Tasmanian demand and Basslink flow during the week | Chart showing the half hour energy demand (MW) and how it was met by Tasmanian generation and Basslink. Exports are shown as Tasmanian generation both meeting Tasmanian demand and exporting to the mainland. |
| Total FCAS costs (Tas) | The total cost of frequency control ancillary services for the week in Tasmania. | AEMO |
| Water storage situation | Data Source |
| System | The total amount of energy in storage as at the beginning of the week, excluding Lake Gardiner, Lake Margaret & Lake Plimsol. This is the value used by Hydro Tasmania, for historical consistency. | Hydro Tasmania |
| NHW (Northern Headwaters) | The amount of energy in storage in Hydro Tasmania's smaller Northern Headwaters lakes - Mersey Forth (Lake Mackenzie, Lake Rowallan and Lake Gardiner), King (Lake Burbury), Anthony Pieman (Lake Murchison, Lake Plimsol and Lake Mackintosh) and Yolande (Lake Margaret). Approximately 40 per cent of Tasmania's hydro generation capacity is supplied by the NHW. |
| Water storage trends | Chart showing the system weekly energy in storage over the past five years |
| Generation | Data Source |
| Hydro generation | The amount of energy produced by Hydro Tasmania's scheduled generators during the week, including exports | NEM-Review™ |
| AETV generation | The amount of energy produced by Aurora Energy Tamar Valley Power Station (AETV) generators during the week |
| Intermittent generation | The amount of energy produced by intermittent generation (semi-scheduled and non-scheduled generators) during the week. Includes non-scheduled hydro generators and wind generation. |
| Fact Sheet | Data Source |
| Market prices | Average, median, maximum and minimum half hourly spot prices for the week and preceding week | NEM-Review™ |
| Maximum and Minimum weekly average price | The highest and lowest weekly average price since NEM entry (April 2006). | Calculated |
| Demand | Maximum, minimum and average system half hour demand. The date and time of the occurrence of peak and low demands are noted | NEM-Review™ |
| Weekly system load factor | Weekly half hour system demand compared to weekly peak demand | Calculated |
| Last season average load factor | Seasonal load factor for the same time in the preceding year | Calculated |
| Weekly energy generation | Total Tasmanian electricity generation (Hydro + AETV + Basslink), also shown in a pie chart | NEM-Review™ |
| Basslink + AETV share | Proportion of Tasmanian demand met by Basslink imports and AETV | Calculated |
| Recorded maximum peak (this year) | Maximum peak demand recorded this year | Derived |
| Recorded maximum peak to date | Maximum peak demand recorded to date | Derived |
| Export / Import | Total weekly import and exports over Basslink | NEM-Review™ |
| Maximum flow | Peak flow (MW) during import and export during the week |
| Inter-regional revenue generated | Calculated inter-regional revenue during Basslink import and export. Price difference Tas-Vic x flow over Basslink during import and export. Losses are not considered in the calculation of revenues. |
| Maximum positive and negative price differential observed during imports/exports | Highest positive and highest negative price difference between Tasmania and Victoria during Basslink flow. |
| Number of intervals counter price flow | Number of half hour trading intervals when there was a negative price difference between Tasmanian and Victorian regions. This indicates the proportion of time during the week when Basslink flow direction ran counter to the price difference between Victorian and Tasmanian regions. |
| % time of counter price flow | The number of half hour trading intervals of negative price differences, as a proportion of time in the week |
| No-go zone flows (% of total MWh flows) | The proportion of Basslink flows that were between 50 MW and -50 MW. |
| Frequency control ancillary service (FCAS) costs | Data Source |
| Total FCAS costs | Total weekly cost of FCAS in Tasmania and rest of NEM. | AEMO |
| % total energy costs | The cost of FCAS as a proportion of total energy costs (energy turnover) |
| Cost of Lower services | Total weekly cost of Lower FCAS services in Tasmania and rest of NEM |
| % total energy costs | The cost of Lower FCAS as a proportion of energy turnover |
| Cost of Raise services | Total weekly cost of Raise FCAS services in Tasmania and rest of NEM |
| % total energy costs | The cost of Raise FCAS as a proportion of energy turnover |
| Price spikes in Tasmania | Data source |
| Price spikes | The number of times the half hour spot price in Tasmania was more than three times the weekly average price (ie considered to be significantly higher than average) | Calculated |
| Demand and price profiles of the week - Tasmania | Chart showing the half hour demand and spot price in Tasmania over the week | NEM-Review™ |
| Other market news and trends | Data source |
| Average spot prices | Comments on the weekly average spot prices across the NEM including the highest and lowest weekly averages | Calculated |
| Market turnover | Total turnover in the energy market (NEM) for the week ($millions), calculated from half hour price and demand data in each region. | Calculated |
| FCAS costs | Total cost of FCAS in the NEM, as a proportion of total energy market turnover. Tasmanian contribution to FCAS costs as a percentage of total FCAS costs in the NEM. | AEMO |
| Price distribution within the week - Tasmania | Chart showing the percentage of time that spot prices were within a range of price bands during the week | Calculated |
| Weekly average prices in the NEM | Chart showing the weekly average (volume weighted) spot price in each region for the week, compared to the preceding week | Calculated |
| Market snapshot | Changes every week. This section often includes other data and information for the week or year, or a series of weeks or years. | Various sources |
| Rainfall map | Tasmanian rainfall information, overlayed with a map of hydro catchment areas. | Bureau of Meteorology |
| Wholesale Electricity Market Contract Regulation | Data source |
| Approved financial contract offer prices for relevant NEM week | Graph shows contract prices for the next six calendar year quarters for the four regulated contract products. More information on wholesale price regulation is provided on the Office of the Tasmanian Economic Regulator's Website. | Hydro Tasmania |
| Purpose of Traffic Light Indicators | Hydro Tasmania is required to ensure that for each quarter there is a sufficient volume of regulated contracts to meet the small customer load in Tasmania. The minimum volume of regulated contracts required to meet the small customer load is referred to as the "Absolute Minimum Offer Volume" with separate amounts for capacity (MW) and energy (GWh).
The traffic light indicators were developed to advise market participants of the availability of regulated contracts in each of the eight forward quarters in which Hydro Tasmania is required to offer regulated contracts.
The availability of regulated contracts in each quarter depends on:
- forecast Tasmanian demand;
- total volume of contracts sold; and
- the remaining Absolute Minimum Offer Volume.
As the volume of existing contracts sold can vary in terms of capacity and energy the traffic light indicators for capacity and energy can be different colours in any given week.
Green light
Where the difference between the volume of contracts sold by Hydro Tasmanian and forecast Tasmanian demand is above a certain level Hydro Tasmania is required to increase the volume of regulated contracts offered. Therefore Hydro Tasmania is required to offer the Absolute Minimum Offer Volume plus a "Supplementary Offer"*.
Red light
Where the difference between the volume of contracts sold by Hydro Tasmanian and forecast Tasmanian demand is less than or is equal to zero Hydro Tasmania is still required to offer the Absolute Minimum Offer Volume.
Amber light
Where the difference between the volume of contracts sold by Hydro Tasmanian and forecast Tasmanian demand is above zero but below the green light level, Hydro Tasmania is required to increase the volume of regulated contracts available but the increase is less than that required for green light conditions. Therefore Hydro Tasmania is required to offer the Absolute Minimum Offer Volume plus a "Reduced Supplementary Offer"*.
To ensure market participants are provided with sufficient notice of a reduction in the volume of regulated contracts available Hydro Tasmania must maintain amber light conditions for 13 weeks before changing to red light conditions.
* Defined in clause 28 of the Wholesale Contract Regulatory Instrument. | |