Appendix One

Submission on the Waikato Regional Policy Statement, Geothermal Section and the Proposed Waikato Regional Plan, Geothermal Module

[ Last Updated 12 January 2006 ]

Additional Utilisation over the Present Level¹²

	Year 2012						Year 2025
	High		Medium		Low		High		Medium		Low
	MWe	GWh	MWe	GWh	MWe	GWh	MWe	GWh	MWe	GWh	MWe	GWh
Horohoro	0	0	9	70	18	140	0	0	9	70	18	140
Kawerau	100	790	150	1180	477	3760	257	2020	357	2810	477	3760
Mokai	42	330	75	590	192	1510	42	330	97	770	192	1510
Ngawha	20	160	40	320	109	860	20	160	64	500	109	860
Ohaaki	0	0	0	0	0	0	0	0	0	0	0	0
Rotokawa	50	390	100	790	393	3100	223	1760	303	2390	393	3100
Rotoma	10	80	20	160	46	360	28	220	35	280	46	360
Tauhara	20	160	70	550	70	550	70	550	70	550	70	550
Tikitere-Taheke	10	80	10	80	10	80	10	80	10	80	10	80
Wairakei	40	320	90	710	432	3400	40	320	182	1430	432	3400
Mangakino	-	-	-	-	120	950	-	-	-	-	120	950
Ngatamariki	-	-	-	-	240	1890	-	-	-	-	240	1890
Reporoa	-	-	-	-	90	710	-	-	-	-	90	710
Tokaanu	-	-	-	-	310	2440	-	-	-	-	310	2440
	292	2310	564	4450	2507	19750	690	5440	1127	8880	2507	19750

Note: High confidence resources are those that are well proven and readily able to be permitted and developed. Achievable development rate has been taken into account. High confidence resources represent an 80-90% confidence that the uptake will occur. Medium confidence estimates represent a median estimate of uptake. Generally these are associated with a more liberal consenting environment. Low confidence estimates represent resources that can be developed but difficulties are expected in terms of permitting and access. They represent a 10-20% confidence that the uptake will occur. Confidence levels are cumulative e.g. the medium confidence resource available will include both the high and medium confidence bands.

Ngatamariki and Mangakino are classified here as low confidence because of their previous status as Protected 2 fields. Given their reassignment into the Development category, their potential as an energy source is good and it would effectively now be considered a system that could be developed with high confidence. Similar increases in confidence would be associated with Reporoa and Tokaanu if they were to be re-classified as Development systems.

Note: these estimates are based on stored heat calculations assuming a 35-year life. The 100 year criteria would limit the potential additional utilisation shown here.

¹²East Harbour Management Board Services Ltd, Availabilities and Costs of Renewable Sources of Energy for Generating Electricity and Heat: Report to the Ministry of Economic Development, September 2002.