| Incumbent Retailer Market Share | |||||||
| Percentage of ICPs held by incumbent retailer by network | |||||||
| Distribution network name | Code | Month | |||||
| 2008/12 | 2009/01 | 2009/02 | 2009/03 | 2009/04 | 2009/05 | ||
| Alpine Energy | ALPE | 68.1% | 68.1% | 68.0% | 68.0% | 68.0% | 68.0% |
| Aurora Energy Ltd | DUNE | 64.8% | 62.5% | 61.8% | 61.2% | 60.8% | 60.3% |
| Buller Electricity Ltd | BUEL | 66.2% | 66.1% | 66.1% | 66.0% | 65.9% | 65.7% |
| CentraLines | CHBP | 63.3% | 63.1% | 62.9% | 62.4% | 62.4% | 61.5% |
| Counties Power Ltd | COUP | 56.3% | 55.8% | 55.5% | 54.7% | 54.2% | 54.1% |
| Eastland Network Ltd | EAST | 83.2% | 83.0% | 83.0% | 81.9% | 79.5% | 77.8% |
| ElectraLines | ELEC | 50.3% | 49.4% | 48.9% | 48.4% | 48.0% | 48.0% |
| Electricity Ashburton Ltd | EASH | 59.5% | 59.3% | 59.1% | 59.0% | 58.9% | 58.7% |
| Electricity Invercargill Ltd | ELIN | 80.3% | 80.3% | 80.3% | 80.1% | 79.8% | 79.6% |
| Horizon Energy Distribution Limited | HEDL | 92.7% | 92.6% | 92.5% | 92.4% | 92.3% | 92.2% |
| Kiwi Income Property Trust | KIPT | 79.8% | 79.5% | 79.7% | 78.7% | 78.4% | 78.4% |
| MainPower NZ Ltd | MPOW | 82.5% | 82.2% | 82.0% | 81.9% | 81.8% | 81.7% |
| Marlborough Lines Ltd | MARL | 76.4% | 76.2% | 76.1% | 75.9% | 75.7% | 75.3% |
| Nelson Electricity | NELS | 54.5% | 54.3% | 54.2% | 54.0% | 53.8% | 53.5% |
| Network Tasman Ltd | TASM | 86.6% | 86.5% | 86.5% | 86.4% | 86.4% | 86.3% |
| Network Waitaki Ltd | WATA | 84.3% | 84.3% | 84.2% | 84.2% | 85.0% | 84.9% |
| Northpower Ltd | NPOW | 44.0% | 43.9% | 43.8% | 43.5% | 43.0% | 42.8% |
| Orion New Zealand Limited | ORON | 62.3% | 62.4% | 62.3% | 62.7% | 62.3% | 61.9% |
| Otago Power Ltd | OTPO | 74.0% | 73.9% | 73.7% | 73.5% | 73.1% | 73.0% |
| Powerco Ltd | POCO | 70.6% | 70.4% | 70.3% | 70.2% | 70.0% | 69.9% |
| Scanpower Ltd | SCAN | 70.7% | 70.6% | 70.4% | 70.2% | 69.9% | 69.0% |
| The Lines Company | LINE | 82.7% | 82.6% | 82.7% | 82.6% | 82.6% | 82.5% |
| The Power Company Ltd | TPCO | 81.7% | 81.6% | 81.6% | 81.3% | 80.9% | 80.8% |
| Top Energy Ltd | TOPE | 89.1% | 88.2% | 80.2% | 76.1% | 74.1% | 73.3% |
| Unison Network Ltd | HAWK | 52.1% | 51.9% | 51.8% | 51.7% | 51.5% | 51.2% |
| United Networks Ltd | UNET | 55.1% | 54.7% | 46.6% | 45.6% | 45.2% | 44.7% |
| Vector Limited | VECT | 72.7% | 72.7% | 72.7% | 72.6% | 72.6% | 72.4% |
| Waipa Power Ltd | WAIP | 67.8% | 67.7% | 67.5% | 67.3% | 67.0% | 66.6% |
| WEL Networks | WAIK | 78.4% | 78.2% | 77.9% | 77.4% | 76.7% | 76.2% |
| Westfields New Zealand | WFNZ | 79.3% | 79.0% | 79.0% | 78.8% | 78.5% | 78.7% |
| Westpower Ltd | WPOW | 85.3% | 85.2% | 85.1% | 85.0% | 84.8% | 84.6% |
| Total | 66.5% | 66.3% | 66.1% | 65.8% | 65.5% | 65.2% | |