New Zealand uses mainly renewable energy sources and the majority of New Zealand electricity is generated by hydroelectric power stations and the rest is generated by both geothermal, wind and thermal sources. Demand for electricity has grown on average 2.1% per year since 1974 and 0.6% from 2005 to 2011. New Zealand has been called one of the least energy efficient countries in terms of economic output compared to to electricity consumption, despite being slightly above the global average in the list of countries for energy intensity. The National Grid, owned and operated by Trans power New Zealand, is the high-voltage transmission network of lines and substations that connect generating areas with cities and towns across the nation. The current Trans power assets include over 11,000 kilometers of transmission line routes and these consist of around 25,000 pylons and 16,000 poles, 174 substations along with around 2,300 circuit breakers and 1,000 power transformers. Most of New Zealand's electricity is generated by hydroelectric sources, if from power stations located on the rivers and lakes of the lower half of the South Island, and in reality the majority of electricity demand is found in the South Island North and particularly in the Auckland Regions. There has always been debate as to whether or not transmission lines are the best way to continue to supply power to this growing demand. As the owner and operator of the national grid, Tran Energy is planning new investments of up to $1.5 billion and, before these can be approved, it must ensure that the Electricity Commission does not have a best way to get the job done. The main purpose of the North Auckland and Northland (NAaN) grid u...... middle of paper ...... is the combination of both but considering cost, efficiency and location. In New Zealand, the technology is limited, so other methods of generating power without the use of transmission lines are also limited. Trans power New Zealand could invest further in implementing new ideas to provide a solution to the alternatives and could also invent new ways of generating and distributing electricity, but my idea is also not limited, because the suggestions have confirmed the sustainability of existing network configuration, although capacity needs to be increased over time as network flows are expected to continue to be dominated by large amounts of loads in the Northern Islands regions, particularly the upper reaches, and therefore electricity will continue to flow mainly from renewable sources in the southern regions.