Recently, a report published by Transpower, a state-owned transmission grid operator in New Zealand, found that with the increase of rooftop photovoltaic solar energy and electric vehicles, the wide use of distributed battery energy storage can support power system. The improvement of battery technology can ensure the safety and reliability of power systems.
New Zealand has met nearly 90% of the electricity demand of renewable energy
According to real-time transmission data on the Transpower website, although New Zealand has applied renewable energy to nearly 90% of its electricity needs, The power generation of photovoltaic has not even been included in the running green energy technology, its installed capacity is 97MW approximately, the proportion in the national energy structure is less than 1%. According to the data of New Zealand Electricity Authority, residential solar occupies the largest share with 80 MW installed capacity, what’s more, half of them was only installed in the past two years.
New Zealand energy systems need more production capacity to transfer to higher electrification, cheap solar energy will be one of the biggest competitors. In a report released earlier this year, Transpower made it clear that residential solar power has 11 GW power generation potential and warned that solar energy facility without battery which storage energy will amplify peak demand in the evening.
In a previous study, Transpower found that power systems can provide up to 2 GW solar power generation in case of minimal impact, while 4 GW solar power generation will have an impact on voltage and frequency management of the power, but the latest report says that increasing distributed energy storage battery can solve this problem.
According to the report of New Zealand Distributed Battery Energy Storage System, found that after smoothing the daily load conditions and delaying investment in grid upgrades, distributed energy storage battery can improve the use of power grid and power generation by operator. In addition, large-scale distribution networks can help to manage low-frequency events in the power system.
In order to tap the potential of battery energy storage, New Zealand has taken important steps to integrate distributed battery energy storage into virtual power plants (VPPs). In last December, Climate Change Minister James Shaw launched the world's largest VPP, which was supplied by local company SOLARCITY and connected 3,000 residential solar + energy storage systems, This system can store 18 MWh energy simultaneously.
The latest report also found that New Zealand's current power system can adapt to the increased load of electric vehicle charging. The low usage rate of 64,000 electric vehicles will not pose a challenge to the operation of power system. In most instances, the number of electric vehicles can be as more as 2 million. Climate Change Minister James Shaw said: “Assume that 2 million electric vehicles will be charged at the end of the working day, the peak demand will increase 25% at night. So we must increase electricity transmission and peak power generation capacity.” Battery storage will help to solve at this point.
New Zealand Sustainable Energy Association claims, a photovoltaic system is installed every 25 minutes all over the country. About 30% of New Zealand household who owns solar system have energy storage batteries. This figure in 2019 is 20% higher than that in 2017 and 16% in 2016 the year.
The application of distributed energe storage battery: