What’s caused the drop in brown coal production?


One of our frequent readers asked us this question a couple weeks ago (whether the drop in brown coal production is attributable to the Carbon Tax).

We’ve had some time today to prepare these additional pieces of analysis to show how output (and capacity factor) of the brown coal stations in Victoria & South Australia has trended over time – each is analysed below:

1)  Yallourn Power Station (VIC)

The following chart from NEM-Review highlights how the output in Yallourn has trended since the start of the NEM (now more than 14 years ago).

Trended output of production levels at Yallourn Power Station

We can see in the chart how output dropped at Yallourn from June 6th 2012 as a result of the flooded mine that set back available capacity significantly, through till early August.

These levels increased following restoration of coal supplies but not back to prior levels following EnergyAustralia’s decision to withdraw one unit from the market (decision taken in October whilst the unit was returned to service in January).

The Carbon Tax would have had some impact in taking this decision – though it seems also likely that the decision would have been taken in the light of the company’s increased portfolio spread (with the addition of the Wallerawang & Mt Piper gentrader contracts) and the ongoing emerging surplus of capacity in the market, due to declining demand.  We’re not in a position to gauge the relative significance of these three (and any other) factors in the decision.

2)  Hazelwood Power Station (VIC)

At the Hazelwood Power Station (the oldest, and most carbon-intensive of the big 4 stations in Victoria) we see that the plant has continued to run at close to full capacity factor (taking into account unit outages for maintenance) since the introduction of the carbon tax.

Trended output of production levels at Hazelwood Power Station

There is no easily discernable difference in dispatch patterns compared to that seen in the prior 13 years of NEM operations.

3) Loy Yang A Power Station (VIC)

At Loy Yang A we see that there has been a slight drop in the capacity factor of the station that occurred after the introduction of the Carbon Tax.

Trended Production Levels at Loy Yang A Power Station

However, as full ownership of the plant (and operational control) passed to AGL Energy in late June 2012, it is probable that some of this change is attributable to portfolio effects (i.e. part of a larger portfolio, hence able to be run more strategically in conjunction with the other assets in the portfolio).

Once again, it is not possible for us to definitively state the the degree to which each factor has contributed.

4) Loy Yang B Power Station (VIC)

At Loy Yang B (the brown coal station with what’s generally understood to be the lowest short-run marginal cost) there is no perceptible change in output since the Carbon Tax has been introduced:

Trended Production Levels at Loy Yang B Power Station

5) Morwell (Energy Brix) Power Station (VIC)

In contrast, the Carbon Tax is seen to coincide with the almost full curtailment of output at the smallest of the 5 brown coal plant in the Latrobe Valley.

Trended Production Levels at Morwell Power Station

Problems at the plant?

6) Northern Power Station (SA)

Crossing the border into South Australia, we see how output at Alinta’s Northern Power Station has been trending downwards for a number of years on the back of declining demand and the increased substitution of wind production for production from thermal plant.

This led to the withdrawal of the station from the market for six-month periods April to September.

Trended Production Levels at Northern Power Station

Alinta took the time to note here that the seasonal withdrawal of Northern’s capacity was made:

“…based purely on market conditions as Alinta Energy is not receiving adequate market returns to operate during those months. The decision is not being made because of the price on carbon. “

We see that, even on its return-to-service for October 2012 to March 2013 its production levels were lower than they had been in prior years.

Of course, WattClarity readers will have a diversity of their own points of view with respect to the above.

7) Playford Power Station (SA)

Last but not least, here’s a chart for Alinta’s Playford plant in South Australia, which highlights how the plant had been challenged for a long time prior to the introduction of the Carbon Tax:

Trended production at the Playford Power Station


In summary, we’ve previously shown how it’s black coal-fired production that has been crunched more significantly in recent years.

There has been some reduction in brown coal-fired production – which is examined in more detail above.  This analysis highlight how it is difficult (if not impossible) in a complex system such as the NEM to tie back outcomes to a single cause and definitively state things* such as “the output of brown coal plants has declined because of the carbon tax” .

*  Or, closer to home, that “the price in QLD was so volatile over summer/Q1 because of generator bidding behaviour” – our forensic autopsy, available from May, will discuss this in detail.

That said, the Carbon Tax will have had some effect – along with declining demand, increased production from wind in the south and gas in Queensland, portfolio changes and other factors.  It’s not possible for us to rank these factors in order of significance.

About the Author

Paul McArdle
One of three founders of Global-Roam back in 2000, Paul has been CEO of the company since that time. As an author on WattClarity, Paul's focus has been to help make the electricity market more understandable.

4 Comments on "What’s caused the drop in brown coal production?"

  1. Note re Morwell Power Station – they confirmed last year that they would no longer operate to generate electricity into the grid – they are only operating one turbine (enough to supply on-site demands from briquette plant). The understanding was this is/was due to higher costs associated with carbon tax, but also combined with poor efficiencies, lower demands etc.
    They received Govt funding to keep briquette plant operating for 2 years – industry noise is that they will close June 30 next year (2014) when funding runs out.

    • Thanks for the added note of detail, Jon.
      I could vaguely recall something like that but could not remember the details.
      Cheers
      Paul

  2. 1) re Energy Brix power station: In June 2012 Martin Ferguson gave HRL – the ower of the Energy Brix plant – $50 million for a “a two-year restructuring package to allow the Latrobe Valley’s Energy Brix Australia Corporation to maintain briquette production while regional businesses that rely on briquettes transition to a cleaner fuel source”.

    See http://minister.ret.gov.au/MediaCentre/MediaReleases/Pages/BriquetteRestructuringPackage.aspx

    2) It is worth mentioning that a central reason why the carbon price has had little effect on the dirtiest coal fired power stations is that their owners have already been paid $1 billion in cash payments in 2011-12 from the $5.5 billion ‘Energy Security Fund’ and more subsidies to keep them going are on offer.

    See http://www.climatechange.gov.au/en/government/initiatives/energy-security-fund-cash-payments/eligible.aspx for a list of the company by company payments.

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