• Overview
• Waterways operating charter
• Drinking water quality
  • Parameters & Reporting Levels
  • Microbiological parameters
  • Pathogen monitoring
  • Routine physical parameters
  • Inorganic chemical parameters
  • Chemical and radiological parameters
  • Organic chemicals
• Environmental Performance
  • Eastern Treatment Plant
  • Western Treatment Plant
  • Rivers and creeks
  • Energy and greenhouse data
  • Water recycling initiatives
• Consultative committees

Energy and greenhouse data

Melbourne Water has established an inventory of its greenhouse gas emissions to better understand the impact our operations have on the global climate and to improve the management of this impact. Melbourne Water has selected 2000/01 as a baseline year for performance comparisons. The inventory can include planned changes to assets and operational management and it is used to forecast how these changes will affect our emission performance. Each year, the actual operational data related to energy use and greenhouse emissions is added to the inventory so that annual performance can be calculated and compared with forecast performance. The following tables show Melbourne Water's performance for 2006/07. The inventory is kept up to date with the Australian Greenhouse Office methodologies.

Total emissions (carbon dioxide equivalent, tonnes)

CO2e Emissions	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06	2006/07	2007/08	2008/09	2009/10
	Actual							Forecast
Electricity (Purchased from Grid)	274087	284664	264349	289144	284738	254676	219752	194107	190150	200162
Natural Gas (for Electricity, Shaft Power & Heat)	4190	1753	4901	5834	6989	6700	7048	19076	19097	19118
Natural Gas (for General)	90	103	142	142	142	126	126	126	126	126
Diesel (for Electricity, Shaft Power & Heat)	3932	3985	3849	3880	5006	5261	3187	60	60	60
Petrol	2261	2120	2267	2356	2434	2501	2099	2182	2182	2182
Diesel Transport	175	199	475	953	842	1053	1313	835	835	835
LPG	76	105	97	107	89	91	109	91	91	91
Methane (Total Direct Emissions)	274634	190563	188463	203926	77776	46147	51065	59925	62526	65128
Nitrous Oxide	6504	6523	7535	6517	4012	6322	6983	6533	6847	7161
Sink CO2 from Trees	-1007	-1395	-1891	-2384	-2912	-3495	-4175	-4834	-5546	-6265
Purchased Offsets	0	0	0	0	0	0	-21736	0	0	0
Total Liable CO2e Emissions	564943	488620	470187	510477	379116	319381	265770	278101	276367	288597

 

Energy consumption by type of fuel (terrajoules)

Energy consumption projections (terrajoules)*	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06	2006/07	2007/08	2008/09	2009/10
	Actual							Forecast
Electricity imported from grid	669	694	651	719	723	672	597	527	517	544
Natural gas imported	67	29	79	94	112	107	113	303	303	304
Diesel imported	51	51	50	50	65	68	41	1	1	1
Biogas used	324	423	369	374	390	441	511	604	605	606
Vehicle fuels	32	31	36	43	42	46	46	40	40	40
Renewable energy offsets	0	0	0	0	0	0	-59	0	0	0
Total energy used	1,141	1,227	1,185	1,281	1,331	1,334	1,250	1,476	1,466	1,495
Increase on 2000/01		108%	97%	108%	104%	100%	94%	118%	99%	102%

 

Energy consumption by operation (terrajoules)

Energy consumption trends (terrajoules)*	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06	2006/07	2007/08	2008/09	2009/10
	Actual							Forecast
Eastern Treatment Plant	681	709	696	719	751	738	722	856	864	868
Western Treatment Plant	85	142	141	143	198	235	251	243	243	243
Winneke water treatment plant	153	170	139	204	163	138	64	142	120	106
Water €" other	37	33	34	33	32	39	37	41	44	48
Sewage transfer	134	128	121	120	122	116	110	124	126	127
Minor sites	7	3	4	5	8	8	5	5	5	5
Vehicles	32	31	36	43	42	46	46	40	40	40
Recycle	0	0	0	0	0	0	0	9	9	42
Other	13	12	14	13	14	15	75	15	15	15
Renewable energy offsets	0	0	0	0	0	0	-59	0	0	0
Total	1,141	1,227	1,185	1,281	1,331	1,334	1,250	1,476	1,466	1,495

 

Renewable energy generation (terrajoules)

Renewable energy generation (TJ per annum)	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06	2006/07	2007/08	2008/09	2009/10
	Actual							Forecast
Eastern Treatment Plant	312	365	304	305	312	298	296	405	405	405
Western Treatment Plant	12	58	65	69	78	144	156	200	200	201
Existing hydro-electricity plants	103	90	114	95	105	104	51	96	109	129
Proposed hydro-electricity plants	0	0	0	0	0	0	0	7	93	145
Purchased offsets	0	0	0	0	0	0	59	0	0	0
Total Renewable energy generation	427	513	484	470	495	545	562	708	808	881
Total Melbourne Water energy use	1141	1227	1185	1281	1331	1334	1250	1476	1466	1495
Renewable energy key performance indicator	37%	42%	41%	37%	37%	41%	45%	48%	55%	59%

 

Emissions per million litres of water supplied (kilograms)

	2000/01	2001/02	2002/03	2003/04	2004/05	2005/06	2006/07	2007/08	2008/09	2009/10
	Actual							Forecast
Carbon dioxide emissions in kilograms per million litres of water supplied	1,118	1,050	972	1,163	860	719	645	641	607	543