Category Archives: Renewable Energy

Loony-toon negative wholesale electricity prices appear in AEMO Queensland data

First time I have noticed negative price from Qld – minus $1,000 MW 3.20am 13 July 2017 – tick “QLD” on left and “5 Min” on right. Who knows why? Just more Govt madness. Not uncommon lately to get negative price periods in Tasmanian data. NEM Dispatch Overview always worth checking – see how Qld is the “anchorman” of our grid. NemWatch gives a generation snapshot.

Minister Frydenberg oddly misleading about Queensland wholesale power prices

Australian Energy Minister Josh Frydenberg states “In Queensland, over the first five months of this year, electricity consumers paid the highest wholesale prices in the NEM, 30 per cent above the average.”
That statement may be technically true but the chart of AEMO daily prices shows it to be misleading. In fact Qld prices were only notably higher than other States during two price spikes in January and February – for the more than four months post 24 Feb 2017 Qld prices have been subdued compared to the other four States in the Eastern Grid.
Starting the chart on 1st Sep 2016 to clear the price spikes relating to the closure of the Port Augusta coal fired generators – NemWatch – AEMO Price-Demand charts – AEMO Raw daily RRP wholesale price data – NEM Dispatch Overview – Larger version chart

Questions about the Tesla grid scale battery proposed at Jamestown South Australia

We have all seen the news blitz – SA Government announces Tesla will build 100MW giant battery as part of its energy security plan 7 Jul 2017 – Elon Musk says the battery has a capacity of 129MWhrs – I am hoping for answers to the following questions – and there may well be others.
A – How many MWhrs will the wind-farm have to generate and be paid for to store 129MWhrs in the battery?
This should reveal the percentage efficiency for the charging of the battery calculated as 129/MWhrs required to charge battery. Another forum Q! & A re battery charging losses.
B – We heard that the battery requires cooling so what is the heat loss expressed in MWhrs over time when the battery is charging? and discharging? Those heat losses must be known.
C – When fully charged and assuming no load – what is the percentage electricity leakage loss per hour for the battery standing idle waiting to work?
D – When the battery is required to use the stored electricity to say meet a peak power shortage in Adelaide – where most demand is – What percentage of the electricity will be lost in discharge and in the 216kms of transmission to Adelaide including losses in voltage stepups and stepdowns normally a part of electricity transmission.
E – I hope the cost is fully revealed in time so the great success can be comprehensively explained to the masses.
F – It would be informative to see an analysis of the effectiveness of the “Salisbury battery storage trial” where at least 100 batteries have been installed at Adelaide homes as at the end of 2016.

I am wondering if in all the process from A to D – would even 50% of the energy input at A ever make it through the battery to consumers in Adelaide?

Global nuclear power numbers from BP

Curious about global nuclear power trends and implications for the uranium market – I extracted the latest from the latest BP Statistical Review of World Energy that now includes 2016. Global electricity generation by fuel type. I had to calculate the fossil fuel column by subtraction.
Click for chart of main global nuclear generating nations. Shows the shutdown by Japan after 2011 earthquake & tsunami – and very slow pace of restarts.

ABC muddles reasons for electricity price rises

The ABC Business Editor Ian Verrender writes – quote – “Ever since the carbon tax was removed, power prices have only headed one way; upwards.” Not according to my Canberra power bills Ian which show clearly how retail prices fell after mid 2014 when the Carbon Tax was repealed. When I get time I can update this chart but there is enough here for now. After 2014 there was talk then action on the closing of Port Augusta coal fired generation which started that huge upsurge in AEMO wholesale prices. Then the closing of Hazelwood took more dispatchable power out of the grid. No wonder prices are on fire.

Dry winter across ditch puts up electricity prices as coal fires up

Thanks to reader on Mainland Aotearoa this story from Stuff – Power price surge too hot for some customers 20 June 2017 – New Zealand is blessed with a high proportion of hydro power but a dry winter so far has lead to higher output at the Huntly coal fired generator south of Auckland. Summary of the Electricity sector in New Zealand – We are having a dry start to winter too but our hydro sector is much smaller than New Zealand.

Why are Tasmanian electricity prices spiking to over $2,000 per MWhr?

Tasmanian electricity is supplied by their Govt owned mostly hydro and lesser wind & gas fired generation.
Why is that Tasmanian wholesale AEMO prices spike to over $2000 per MW hour twice in recent days?
There is only one supplier – Hydro-Electric Corporation owned by the Tasmanian Goverment. Nemwatch for current generation and AEMO for prices and demand charts and AEMO NEM dispatch overview. Obviously Hydro Tasmania is in a dry spell and in order to conserve water levels will buy Victorian power through BassLink when prices suit them – see the AEMO NEM dispatch overview for interstate flows in real time.