Real-time price API result, what is load and what is generation values

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Last post 30 August 2018

icepicknz posted this 23 August 2018 - Last edited 15 January 2019

Hey guys,

Just wondering what the unit is for the results from an API query for real-time. For instance, below is the output for pnode SWN2201, load is 0.16 and generation is 0. I assume once this node (Mercurys new battery) starts pushing to the grid, it will show a generation value. Is this generation value a percentage value or GW/h value etc? same goes for load, is this saying the node is noding 160kW (0.16MW) or is it 0.16GW? just wanting to perhaps graph the load vs generation to see when its charging / discharging with the and put the realtime price on the graph too see when mercury are choosing to use the battery.

While i'm on it, does anyone know if Vectors battery has a pnode and if so what it is, would be interested to see how these Tesla batteries are being used and when.

{"interval":"23-AUG-2018 12:40","interval_datetime":"2018-08-23T12:40:00","five_min_period":3,"isDayLightSavingHR":0,"pnode":"SWN2201","load":0.16,"generation":0,"price":78.94}

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Phil Bishop posted this 24 August 2018 - Last edited 13 February 2020

Load and generation units are megawatts.

Technically speaking, in an instantaneous sense, price is $/MW but as a practical matter you can imagine the MW stay at the same rate for an hour and refer to the price as $/MWh.

Be aware that we publish price, load and generation via an API for both the RTP and the RTD cases - see here for more on SPD cases. Also be aware that load and generation from SPD are quite different than what you'll see each month coming out of reconciliation, say.

Finally, note that only prices from the RTP case are published on WITS. The prices from the RTD cases are not published anywhere, except via our API. The RTD case is the source of dispatch instructions issued by the system operator.

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Phil Bishop posted this 24 August 2018 - Last edited 24 August 2018

I believe Mercury's battery is at Southdown. Whether it injects into SWN2201 or SWN0251 or some other yet-to-be commissioned point of connection I have no idea. I guess we'll see soon enough.

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Phil Bishop posted this 30 August 2018

Mercury's battery has been offered in and dispatched at SWN2201 SWN1 in recent days.

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icepicknz posted this 30 August 2018

thanks; mercury did advise me that SWN2201 was the battery

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icepicknz posted this 30 August 2018

The grid demands at https://www.emi.ea.govt.nz/Wholesale/Reports/W_GD_C?DateFrom=20180827&DateTo=20180829&RegionType=POC&seriesFilter=SWN0251,SWN2201&_si=v|3 for instance; do they have a negative graph for generation; or is generation shown on any graphs?

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