The great de-electrification

Up until six years ago, power demand growth could be counted on with metronomic precision. Now, demand keeps slipping, likely leading to an unprecedented restructure of the generation sector.

The Conversation

One of the certainties in the energy business used to be the regular year-in, year-out rise in demand for electricity*.

Up until about six years ago, demand growth could be counted on with metronomic precision. Across our National Electricity Market – the NEM – electricity demand grew at about 2 per cent annually.

That all stopped in 2008. On the basis of the numbers for June and July this year, we are on the verge of our twelfth straight season where demand has reduced on the year before.

Annualised seasonal demand changes for the mainland states in the National Electricity Market (NEM). Noting that latest winter figures are incomplete (2013 data includes Winter months June and July only), we are on target for our 12 straight season of demand reduction. AEMO Price and Demand data - http://www.aemo.com.au/Electricity/Data/Price-and-Demand

Over the last three years, the annualised demand reduction has been about 500 megawatts – or about 2.2 per cent. And since the peak in 2008, average demand has reduced by about 2 gigawatts or about 8 per cent.

On these figures, Australia is clearly undergoing a profound de-electrification. If it continues for a few more years then, by analogy with economics, it will be worthy of the appellation the great de-electrification.

To appreciate the real significance of these numbers we need to look back a few years. Because the planning for new generating plant takes many years, we are still in an investment cycle that dates back half a decade or more.

Looking back to 2007 and the outlook for electricity investment was looking rosy. In 2007 planning would have been for a generation capacity growing at 2 per cent each year. Then forecasts were for an average winter-time demand of around 26 gigawatts.

Average demand for the winter months of June and July for the mainland states on the NEM shown in red. The green line shows the projection of the 2000-2007 growth trend of 1.8 per cent. AEMO Price and Demand data - http://www.aemo.com.au/Electricity/Data/Price-and-Demand

That is almost 4.5 gigawatts greater than we have seen so far this winter. In percentage terms the 2007 forward projections were out by about 17 per cent.

Projected demand deficit as a percentage, calculated as the difference between predicted demand growth on the 2000-2007 trajectory and the realised demand (for the winter months of June and july). AEMO Price and Demand data - http://www.aemo.com.au/Electricity/Data/Price-and-Demand

And the problem is that all the pointers seem to indicate demand reduction is accelerating. The latest figures for the June-July period show the largest annual reduction recorded – amounting to about 5 per cent on those forward projections.

Across the NEM the generating capacity is a bit over 50 gigawatts, or a bit over twice the average demand.

The fall in demand is creating a tremendous capacity overhang in generation. That has significantly depressed wholesale electricity prices over the last few years.

And that is impacting industry players such as AGL, who have been recently reported as calling for a retirement of up to 9 gigawatts of generation capacity across the NEM.

That is a massive amount, representing a bit more than the total capacity of the generation fleet in the Latrobe Valley that supplies about 85 per cent of Victoria’s electricity.

The logic for a 9 gigawatt retirement is straight forward. At about 17 per cent of the total NEM-wide generation capacity, it is more-or-less identical with the demand reduction on the forward projections of just 6 years ago shown in the figure above.

The big question in the electricity game is what will happen to demand in the next few years. Despite industry pundits having consistently forecast return to growth for a number of years, all the signs are that demand reduction is accelerating.

Certainly the trends in the figures shown above seem to indicate we haven’t bottomed out yet. So at least for the near term the great de-electrification is a stronger bet than a return to growth.

If so, there will be need for very significant restructuring in the generation sector, of the likes we have never seen. In the meantime we should expect some very aggressive repositioning amongst our energy utilities.

In a normal market, oversupply should lead to some very aggressive pricing to maintain market share. The question is, how normal is our electricity market?

* The term 'demand' is used here to refer to the average demand and so provides a measure of the total electricity demand over period of time, rather than the instantaneous “peak” in demand.

Mike Sandiford is Professor of Geology and the Director of the Melbourne Energy Institute at the University of Melbourne.

The ConversationThis article was originally published at The Conversation.