Appendix 3: Grid Upgrade Plan approvals
Transpower New Zealand Limited: Managing risks to transmission assets.
This table uses data from Transpower's Grid Upgrade Plans 2005-2007.
| Project | Type of investment | Status | Cost $million |
|---|---|---|---|
| 2005 Grid Upgrade Plan | |||
| North Island grid upgrade project | Reliability | approved July 2007 (amendment was submitted in October 2006) | 824.0 |
| Otahuhu Substation Diversity Proposal | Reliability | approved August 2007 | 99.0 |
| Central North Island Upgrades | Economic | approved April 2008 | 18.0 |
| HVDC Pole 1 Replacement Proposal | Reliability | revised HVDC proposal submitted in May 2008 | N/A |
| 2007 Grid Upgrade Plan | |||
| West Coast project | Reliability | approved July 2008 (revised proposal submitted in March 2008) | 19.0 |
| HVDC Proposal | Economic | approved September 2008 | 672.0 |
| North Auckland and Northland Investment Proposal 1 | Reliability | approved March 2009 | 473.0 |
| North Auckland and Northland Investment Proposal 2 | Reliability | withdrawn April 2009 | N/A |
| 2008 Grid Upgrade Plan | |||
| Wairakei Ring | Economic | approved February 2009 | 141.0 |
| Maungatapere Bus Security | Reliability | approved February 2009 | 4.1 |
| Wellington 110kV interconnection | Reliability | approved March 2009 | 9.6 |
| Woodville-Mangamaire-Masterton transmission | Reliability | approved March 2009 | 17.4 |
| Redclyffe Bus Security | Reliability | approved May 2009 | 1.9 |
| Marsden substation | Reliability | approved July 2009 | 6.4 |
| Bombay 110kV Bus Security | Reliability | approved August 2009 (withdrawn in May 2009 and resubmitted in June 2009) | 4.7 |
| Redclyffe 220 110kV interconnection | Reliability | deferred in February 2010 – trial to be conducted | N/A |
| 2009 Grid Upgrade Plan | |||
| Wanganui-Stratford transmission | Reliability | approved November 2009 | 44.1 |
| Bay of Plenty interconnection capacity | Reliability | approved December 2009 | 21.5 |
| Lower South Island renewables | Economic | approved August 2010 | 197.0 |
| Auto synchronisation points | Reliability | approved March 2010 | 9.5 |
| Upper North Island Dynamic reactive support | Reliability | approved July 2010 | 110.2 |
| Lower South Island reliability | Reliability | approved September 2010 | 62.4 |
| Bunnythorpe-Haywards thermal upgrade | Economic | approved September 2010 | 3.5 |
| Total approved by the Electricity Commission | 2,738.3 | ||