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AN UPDATE on GEOTHERMAL ENERGY in NEW ZEALAND Brian

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AN UPDATE on GEOTHERMAL ENERGY in NEW ZEALAND Brian Proceedings of the 7th Asian Geothermal Symposium, July 25-26, 2006 AN UPDATE ON GEOTHERMAL ENERGY IN NEW ZEALAND Brian WHITE New Zealand Geothermal Association, PO Box 11-595, Wellington, New Zealand E-mail: [email protected] ABSTRACT The New Zealand geothermal scene is currently very active. There has been recent installation of new generation, with more generation being planned and prepared for. While direct heat use has been relatively static, some market leaders are now installing geothermal heat pumps, and this looks like an area for considerable growth. Various regional and district councils have been, or are in the process of clarifying the rules and policies related to takes of water. Central Government remains philosophically dedicated to the greater use of renewable low-emission energy forms (including geothermal energy), but is now trying to clarify its wider energy strategies and means of encouraging further uptake of renewables. Key Words: policy, geothermal energy, New Zealand, electricity generation, direct heat use, geothermal heat pumps, consents. 1. INTRODUCTION Geothermal energy can be found in high temperature fields in the Taupo Volcanic Zone and Northland (suitable for both power generation and direct use); medium/low temperature fields mainly located in the upper North Island or throughout the Southern Alps (potential heating applications); or low temperature resources at shallow depths anywhere in the country (suitable for ground-source heat pump applications). Among the various renewable resources available to New Zealand, geothermal energy is the only resource that can directly supply both heat and electricity, and has become increasingly competitive, especially as thermal fuels have increased in price and exchange rate improved. It is independent of climate and is the only renewable energy source that can provide long term reliable base load electricity generation. The installed capacity of geothermal electricity generation in New Zealand is currently 450 MWe, or about 5% of the total capacity, plus about 7 PJ per year in direct heat largely at Kawerau. Geothermal generation can meet 7% of peak demand, and typically produces 6% to 8% of total generation. New Zealand companies have recently been gearing up for increased investment in the domestic market. Initial focus is on further development of existing operations, but some preparations are in hand for “greenfield” developments. Figure 1 shows the increase in drilling as a precursor to these developments. Industry participants consider between 400 and 600 MWe of new generation could be constructed over the next 10 years, allowing for a wide range of restrictions and conservative behavior. There are several companies with experience in geothermal power development in New Zealand (for details refer to the 2005 SKM report). Two companies that are frequently mentioned in this paper are Contact Energy and Mighty River Power. Contact Energy is an electricity generator, and electricity and gas retailer with a mix of generation assets that include hydro, gas, cogeneration and geothermal. Contact Energy was split from the national electricity corporation in 1996 and given the major geothermal generation stations and their staff, and was subsequently fully privatised. The majority shareholder in Contact Energy is Origin Energy of Australia, with the rest of the company freely traded on the New Zealand stock market. It operates the Wairakei, Poihipi and Ohaaki geothermal power stations, has resource consents over Tauhara and a landholding at Mokai. Its recent geothermal focus has been on renewing consents for its existing operations, managing relationships with other operators on the Wairakei field, drilling makeup steam supplies, developing a binary cycle plant at Wairakei and participating in the development of the Environment Waikato geothermal plan and policy statement. Mighty River Power is one of three state-owned enterprises (SOEs) created from the final breakup of the national electricity corporation in 1999 following the Electricity Reform Act 1998. By that time the corporation had developed new geothermal projects and these were largely vested in Mighty River Power. The company has a range of generation assets, of which the principal assets are the string of hydro stations on the Waikato River. However it is the only SOE to develop a geothermal business case and to subsequently establish a significant team to progress these projects. Given 1 White: Special Lecture on Geothermal Energy in New Zealand that the Government has a policy of non-sale of Crown assets, and wants to see its legacy geothermal wells developed, and can transfer assets to an SOE without effecting a sale, this makes Mighty River Power the developer of Crown geothermal assets (subject to fulfillment of Treaty of Waitangi obligations, as explained later). Mighty River Power has a 25% share in the Tuaropaki Power Company, and Operations and Maintenance contract for Mokai development. Mighty River Power also owns the Rotokawa geothermal power station (having purchased it from another developer in 2000), has a half share in the steamfield company and has the Operations and Maintenance contract for that facility. It has further interests at Kawerau including Operations and Maintenance contracts and a planned development. Mighty River Power’s geothermal business case was based around the exploration and development of a number of geothermal fields. In practice, the company has had difficulty in securing land access for developments, after some initial successes. This has meant that the company has had to interrupt an active drilling programme and release rigs back overseas. 25 500 450 Wells Drilled/Year 20 400 Installed Capacity 350 15 300 250 10 200 Number of Wells per Year per of Wells Number 150 Cumulative Installed Capacity (MWe) 5 100 50 0 0 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Figure 1: Historical Drilling of Geothermal Wells in New Zealand 2. CENTRAL GOVERNMENT ISSUES In February 2002 the Government issued a report entitled “Growing an Innovative New Zealand”. This report contains an umbrella policy for government action. Broadly, what the Government wants “Economic Transformation” to a knowledge-based economy to lift New Zealand’s standing relative to other OECD countries. The two key aspects for building an economy capable of sustaining the higher growth rates needed are a) a strengthening of foundations (including critical infrastructure such as our electricity generation and transmission system) and b) building more effective innovation. This Economic Transformation policy requires wide cross-government consultation. While each initiative has a lead Ministry, officials from a wide range of Ministries will be active members of each project. There is an emphasis on Whole-of-Government positions that can help eliminate confusion at policy implementation level. There is an emphasis on sustainable growth and development. This flows through to sustainable programmes of action for such issues as energy and water, both of which have an impact on geothermal development. Energy has been identified as one of the target areas for sustainable development because of its strong correlation to economic growth, potential environmental impact, and because both consumers and industry are heavily reliant on its supply. The major objective of the programme of action for energy is to ensure continued delivery of energy services to all classes of consumer in an efficient, fair, reliable and sustainable manner. Three desired outcomes are that energy use in New Zealand becomes progressively more efficient and less wasteful, renewable sources of energy are developed and maximised, and New Zealand consumers have a secure energy supply. 2 Proceedings of the 7th Asian Geothermal Symposium, July 25-26, 2006 Over the last two decades, New Zealand’s energy policy has been marked by a commitment to light handed regulation and to ongoing government monitoring and review. However, new and ongoing security of supply and environmental issues (there have been three wholesale electricity market price crises brought about by low hydro inflows and thermal fuel issues since 2001) have necessitated ongoing policy development and government action. This was summarised in a Government Policy Statement on Electricity Governance issued in October 2004. The establishment of the NZ Electricity Commission, the 155 MWe reserve power plant and the Gas Industry Company to provide regulatory oversight to industries that had previously been left to self regulation are recent results of this. There has been a long term emphasis on promoting energy efficiency and further increasing the amount of energy produced from renewable resources reflected in the establishment of the Energy Efficiency and Conservation Authority (EECA) as a Crown entity in 2002 to assist with the implementation of the National Energy Efficiency and Conservation Strategy (NEECS) announced in 2001. This strategy had a 5 year term so has been actively reviewed over this last year. The strategy included the specific goals of improving energy efficiency by 20% and increasing consumer energy from renewable sources by 30 PJ by 2012 over levels recorded for the year 2000. Progress has been limited so it is likely that the specific goals will be revised. Perhaps more significantly, it has been recognised that incentives for action by industry have been inadequate. Consultation will soon identify a range of incentives and controls
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