Energy and peak demand information in the National Electricity Market is presented below. Figures include Tasmania from 29 May 2005. Figure 1 highlights the annual national energy along with national summer and winter peak demands. Figure 2 shows the relationship between the regional peak demands and the coincident national peak for summer and winter.
Figure 1 National energy
Figure 2 Regional demand
Figures 3 and 4 compare the average maximum temperatures for the summer (December to March) and winter (May to August) respectively, with the long-term averages for the same periods. Together with figures 1 and 2, these graphs highlight the effect of temperature on peak demand and energy. The trends in energy and seasonal peak demand are also tabulated. Tasmania is included from 29 May 2005.
Figure 3 Summer temperatures
Figure 4 Winter temperatures
Figure 5 shows the total annual energy consumption in each region and the national total for the financial year.
Figure 5 Annual energy (TWh)
QLD
NSW
SNOWY^
VIC
SA
TAS
National
2010–11
51.4
77.6
-
50.8
13.5
10.1
204.0
2009–10
53.2
78.1
-
51.2
13.3
10.0
206.0
2008–09
52.6
79.5
-
52.0
13.4
10.1
207.9
2007–08
51.5
78.8
1.6
52.3
13.3
10.3
208.0
2006–07
51.4
78.5
1.2
51.5
13.3
10.2
206.3
2005–06
51.3
77.3
0.5
50.8
12.9
10.0
202.8
2004–05
50.3
74.8
0.6
49.8
12.9
1.0"
189.7
2003–04
48.9
74.0
0.7
49.4
13.0
185.3
2002–03
46.3
71.6
0.2
48.2
13.0
179.3
2001–02
45.2
70.2
0.3
46.8
12.5
175.0
2000–01
43.0
69.4
0.3
46.9
13.0
172.5
1999–00
41.0
67.6
0.2
45.8
12.4
167.1
1998–99*
21.7
36.1
0.1
21.8
6.7
86.4
^ represents pump load * 6 months " Tas entered the market on 29 May 2005
Figure 6 shows the peak demand for summer and winter and the date on which it occurred.
Figure 6 Seasonal peak demand (MW)
QLD
NSW
SNOWY^
VIC
SA
TAS
National
Winter 2011
7636 09/06/11
12 881 19/07/11
-
7929 07/06/11
2364 15/06/11
1701 25/07/11
31 335 19/07/11
Summer 2010-11
8809 21/02/11
14 589 01/02/11
-
9585 01/02/10
3378 31/01/11
1484 12/04/11
34 933 02/02/11
Winter 2010
7338 29/06/10
13 198 29/06/10
-
8013 20/07/10
2505 01/07/10
1690 16/07/10
32 274 29/06/10
Summer 2009-10
8902 18/01/10
13 769 22/01/10
-
9879 11/01/10
3110 09/02/10
1390 30/11/09
33 758 11/01/10
Winter 2009
7687 11/06/09
12 981 10/06/09
-
8130 10/06/09
2358 06/07/09
1677 09/07/09
32 094 11/06/09
Summer 2008-09
8699 09/02/09
14 097 06/02/09
-
10 445 29/01/09
3318 28/01/09
1479 09/11/08
35 551 29/01/09
Winter 2008
8204 28/07/08
14 287 28/07/08
706 12/05/08
8037 28/07/08
2439 28/07/08
1743 11/08/08
34 422 28/07/08
Summer 2007–08
8083 22/02/08
12 944 30/01/08
708 26/01/08
9776 17/03/08
3077 17/03/08
1526 01/04/08
31 990 14/01/08
Winter 2007
7838 20/06/07
13 894 17/07/07
704 11/07/07
8307 17/07/07
2383 25/06/07
1749 18/06/07
33 145 13/08/07
Summer 2006–07
8594 12/03/07
12 868 30/01/07
701 18/02/07
9012 16/01/07
2860 16/02/07
1473 16/11/06
31 796 5/02/07
Winter 2006
7615 20/06/06
13 078 20/07/06
249 18/06/06
7846 05/06/06
2364 14/06/06
1697 07/08/06
31 674 05/06/06
Summer 2005–06
8271 14/02/06
13 297 2/02/06
474 27/01/06
8714 24/02/06
2872 20/01/06
1305 20/03/06
31 104 23/01/06
Summer 2005–06 (excluding Tas.)
8271 14/02/06
13 297 2/02/06
474 27/01/06
8714 24/02/06
2872 20/01/06
29 963 23/01/06
Winter 2005
7 350 12/08/05
13 123 23/06/05
193 19/07/05
7759 10/08/05
2263 12/07/05
1718 27/06/05
31 244 23/06/05
Winter 2005 (excluding Tas.)
7350 12/08/05
13 123 23/06/05
193 19/07/05
7759 10/08/05
2263 12/07/05
29 742 23/06/05
Summer 2004-05
8189 08/02/05
12 854 30/11/04
690 24/12/04
8492 25/01/05
2625 11/01/05
1352 2/12/04 **
28 803 23/02/05
Winter 2004
7106 21/06/04
13 041 19/07/04
680 6/06/04
7437 28/07/04
2207 3/08/04
1728 19/07/04 **
29 242 19/07/04
Summer 2003-04
7918 23/02/04
12 216 9/03/04
680 16/02/04
8583 17/12/03
2602 16/12/03
1341 **
29 791 20/02/04
Winter 2003*
6778 31/07/03
12 468 28/07/03
212 25/06/03
7499 30/07/03
2158 23/06/03
1684 **
28 358 30/07/03
Summer 2002-03
7105 31/01/03
12 332 30/01/03
343 10/11/03
8041 24/02/03
2787 4/02/03
28 556 29/01/03
Winter 2002
6345 2/07/02
12 074 18/06/02
258 23/06/02
7300 27/06/02
2129 27/06/02
27 230 2/07/02
Summer 2001-02
7045 11/02/02
10 982 21/01/02
148 5/03/02
7581 14/02/02
2500 19/02/02
26 303 18/03/02
Winter 2001
6397 9/07/01
11 713 9/07/01
194 5/06/01
7137 14/06/01
2095 24/07/01
26 569 9/07/01
Summer 2000-01
6584 29/01/01
11 547 24/01/01
238 15/02/01
8019 8/02/01
2833 7/02/01
27 502 25/01/01
Winter 2000
6343 6/06/00
11 822 30/05/00
134 25/05/00
7113 29/05/00
2142 28/06/00
26 977 5/06/00
Summer 1999-00
6340 21/01/00
10 662 9/02/00
130 23/12/99
7717 2/03/00
2646 2/02/00
25 301 2/03/00
Winter 2000
5879 28/06/99
11 424 15/06/99
737 18/06/99
6745 15/06/99
1921 2/08/99
25 713 15/06/99
Summer 1998-99
5994 18/02/99
10 275 15/02/99
129 22/12/98
6670 4/02/99
2427 4/02/99
23 836 3/02/99
^ represents pump load * demand value changed from TOTAL DEMAND to INITIAL SUPPLY ** Tasmania demand not included in the national demand
Figure 7 shows the peak demand for summer and winter including the effects of significant intermittent generation (such as wind farms) and the date on which it occurred. When the date is different to that in figure 6, the record is in bold. Intermittent generation is shown in italics.
Figure 7 Maximum demand including intermittent generation (MW)
Figures 8 and 9 show the quarterly volume weighted average spot prices since market start, including Tasmania from 29 May 2005. Figure 10 shows the annual volume weighted average on the same basis.
Figure 8 Regional quarterly volume weighted average spot prices since market start
Figure 9 Quarterly volume weighted average prices since market start ($/MWh)
QLD
NSW
SNOWY
VIC
SA
TAS
Sep 2011
29
30
-
30
37
30
Jun 2011
26
28
-
30
32
32
Mar 2011
65
90
-
41
83
27
Dec 2010
21
23
-
19
23
21
Sep 2010
22
30
-
26
29
41
Jun 2010
22
30
-
49
34
40
Mar 2010
46
52
-
67
134
27
Dec 2009
53
100
-
29
134
31
Sep 2009
26
28
-
25
27
24
Jun 2009
32
35
-
34
35
106
Mar 2009
37
43
-
87
161
55
Dec 2008
39
51
-
34
32
44
Sep 2008
36
41
-
42
42
44
Jun 2008
38
42
30
47
46
61
Mar 2008
80
34
27
50
243
54
Dec 2007
56
41
30
44
46
44
Sep 2007
56
59
39
60
62
65
Jun 2007
119
146
65
99
83
74
Mar 2007
60
57
29
75
69
50
Dec 2006
23
27
22
29
40
37
Sep 2006
26
39
35
39
43
42
Jun 2006
25
28
27
30
38
38
Mar 2006
39
46
34
53
58
33
Dec 2005
39
73
28
32
47
63
Sep 2005
22
29
25
30
34
100
Jun 2005
23
28
23
27
36
Mar 2005
25
35
21
22
31
Dec 2004
48
90
33
38
54
Sep 2004
27
31
22
28
36
Jun 2004
29
33
24
31
34
Mar 2004
45
60
21
30
64
Dec 2003
20
21
20
24
33
Sep 2003
28
33
27
23
26
Jun 2003
25
33
27
28
28
Mar 2003
23
33
20
24
30
Dec 2002
64
39
26
28
32
Sep 2002
54
43
30
38
40
Jun 2002
58
66
43
49
50
Mar 2002
35
28
23
27
29
Dec 2001
31
28
22
28
27
Sep 2001
27
30
25
28
28
Jun 2001
34
34
30
32
36
Mar 2001
56
52
31
72
110
Dec 2000
44
27
26
37
56
Sep 2000
44
49
49
54
60
Jun 2000
59
41
37
40
54
Mar 2000
77
35
22
29
90
Dec 1999
28
19
16
18
78
Sep 1999
32
26
21
23
78
Jun 1999
31
29
21
29
50
Mar 1999
94
21
17
25
60
Figure 10 Annual volume weighted average prices ($/MWh)
d-cyphaTrade working in collaboration with the Federal Department of Industry, Tourism and Resources developed a wholesale electricity price index (WEPI) for the Australian electricity market in November 2002. The WEPI is intended to be a simple, easily reportable index that reflects daily changes to contract and spot market conditions and their effect on the stability of the underlying wholesale price for electricity in the market.
The index, which was launched on 13 November 2002, is intended to provide a proxy for the underlying wholesale market trends on a daily basis. It reflects changes in exchange traded contract and spot prices, load conditions and the proportion of total load contracted at any one time. The index is calculated for each region separately. As yet, no index exists for Tasmania. Figure 12 tracks the WEPI since 2004.
Figure 12 d-CyphaTrade wholesale electricity price index
Figure 16 shows the quarterly trend in the volatility index across all regions during peak periods since market start. It highlights the convergence of price levels and characteristics, especially since early 2001. Tasmania is included from September 2005.
Figure 16 Regional peak price volatility index
See also the analysis of market price volatility attached below.
