Disclaimer. This presentation does not constitute financial advice.

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1 Page 1 Mighty River Power Interim Results 2012

2 Disclaimer The information in this presentation was prepared by Mighty River Power Limited with due care and attention with every effort made to ensure its accuracy. The presentation may contain projections or forward looking statements regarding a variety of items. Such projections or forward looking statements are based on current expectations, estimates and assumptions made by management and are subject to a number of risks, uncertainties and assumptions. There can be no assurance that results contemplated in any projections and forward looking statements in this presentation will be realised. Actual results may differ materially from those projected in this presentation. This presentation does not constitute financial advice. Page 2 Mighty River Power Interim Results 2012

3 About Mighty River Power New Zealand s only large, renewables dominated energy company with both hydro and geothermal generation Core business based on diversified low fuel cost electricity generation portfolio complemented by sales to business and homes 90% renewable generation, with major geothermal share, supported by a multi-unit, gas-fired plant in Auckland Generation assets located in the upper North Island, close to major industry and residential demand Sales to commercial customers and through retail brands, Mercury Energy, Bosco Connect and Tiny Mighty Power, accounting for 18% of total NZ energy consumption Top 10 global geothermal business leveraging expertise in US, Chile and Germany Page 3 Mighty River Power Interim Results 2012

4 Overview HIGHLIGHTS Lift in operating earnings and underlying performance Gains in market share and pricing in generation and sales Geothermal growth Hudson Ranch I and Ngatamariki FINANCIAL RESULTS Underlying earnings growth supported by diverse and balanced operational base Strong cash flows with NPAT impacted by non-cash fair value movements Diversified debt portfolio with no refinancing required until December 2013 BUSINESS UPDATE Increased sales and generation volumes against backdrop of flat national demand Higher electricity prices from customers and for generation High Court upholds UTS ruling Further appeals pending OUTLOOK Hudson Ranch I commissioning March / April 2012 Construction of Ngatamariki with commissioning expected mid 2013 Lift in FY2012 earnings guidance Page 4 Mighty River Power Interim Results 2012

5 HIGHLIGHTS Financial Highlights HY2012 ($m) HY2011 ($m) % Change Energy Margin EBITDAF Underlying Earnings NPAT Dividend Financial results built on the company s diverse and complementary portfolio, market share and pricing gains in generation and customer sales Improvement in operating earnings driven by 4.5% increase in weighted average price (FPVV) received from residential and commercial customers, and $7m gain from sale of PRE credits Significant fall in NPAT due to non-cash fair value movements recognised under IFRS predominantly as a result of a global fall in long-term interest rates Underlying earnings up 14% (earnings after removing significant one-off items and the change in the fair value of financial instruments) Page 5 Mighty River Power Interim Results 2012

6 HIGHLIGHTS Market Dynamics National storage levels below average due to dry conditions in the South Island High wholesale spot price as a result of poor national hydrology Page 6 Mighty River Power Interim Results 2012

7 HIGHLIGHTS Market Dynamics Lake Taupo hydrology close to average Continuing flat demand growth Customer churn continuing at elevated levels confirming competitive environment Page 7 Mighty River Power Interim Results 2012

8 HIGHLIGHTS Gains in Market Share and Pricing Higher generation largely due to greater use of gas-fired generation in response to higher wholesale prices Geothermal base-load reliable and slightly increased from pcp Page 8 Mighty River Power Interim Results 2012

9 HIGHLIGHTS Sales and Pricing HY2012 HY2011 Change % Change Electricity customers 383, ,000-19, Electricity sales (GWh) 2,555 2, Residential FPVV 1,408 1, Commercial FPVV 1,148 1, Weighted average sales price (FPVV) $ $ $ Achieved increases in FPVV sales and pricing despite lower customer numbers Strong growth in commercial customers Expansion into small provincial towns Supported by a range of customer retention initiatives 3yr fixed price offers introduce in FY2011 attracting 80,000 customers GLO-BUG prepayment solution based on smart meters Page 9 Mighty River Power Interim Results 2012

10 FINANCIAL RESULTS Page 10 Mighty River Power Interim Results 2012

11 FINANCIAL RESULTS Financial Performance HY2012 ($m) HY2011 ($m) $m Change % Change FY2011 ($m) EBITDAF Depreciation and amortisation Change in fair value of financial instruments Impairments Equity accounted earnings of interest in jointly controlled entities Equity accounted earnings of associate companies EBIT Net interest expense Profit before income tax Income tax expense NPAT Page 11 Mighty River Power Interim Results 2012

12 FINANCIAL RESULTS EBITDAF EBITDAF improved 9% driven primarily by a 4.5% increase in the weighted average price (Fixed Price Variable Volume) received from residential and commercial customers Higher wholesale prices increased generation sales value and correspondingly increased costs for spot purchases $7m earned from sale of carbon credits (PREs earned by the Nga Awa Purua project) Page 12 Mighty River Power Interim Results 2012

13 FINANCIAL RESULTS EBITDAF to NPAT Non cash fair value movement in financial instruments impacted strongly by decrease in long-term global interest rates ($85.7m relates to fair value movements in NZ derivatives and $20.3m relates to our share of the fair value movements of derivatives associated with offshore investment) Increased non-cash depreciation charge due to FY2011 asset revaluation Net interest expense reflects higher average debt levels and cost of funds Page 13 Mighty River Power Interim Results 2012

14 FINANCIAL RESULTS Fair Value of Financial Instruments Downward shift in global swap yield curves over the last four years Historically record low levels resulted in large non-cash fair value adjustments Mighty River Power does not hedge account for interest rate derivatives Fair value of derivatives subject to future interest rate movements Page 14 Mighty River Power Interim Results 2012

15 FINANCIAL RESULTS Operating Expenses Operating expenses are favourable to pcp however this is expected to correct in the second half due to the timing effect caused by the re-scheduling of maintenance projects Other operating expenses include favourable FX movements (unrealised foreign currency translation) International geothermal costs relate to the operating costs of the GGE Fund (US/Chile/Germany) higher due to increased development activity and includes some prior period costs previously capitalised. Page 15 Mighty River Power Interim Results 2012

16 FINANCIAL RESULTS Capital Expenditure Kawerau and Nga Awa Purua construction FY2007 FY2010 No major domestic projects under construction FY2011 $1 billion new geothermal investment FY2006 FY2010 Ngatamariki construction commenced FY2012 with commissioning expected mid 2013 Capex spent $163.7m, mainly for Ngatamariki ($94.6m) and investments in international geothermal projects ($38.6m) Page 16 Mighty River Power Interim Results 2012

17 FINANCIAL RESULTS Debt Maturities Average debt maturity profile 5.9 years at 31 December 2011, from 6.4 at 30 June Total debt facilities increased by $50m to $1,360m with $1,025m drawn, $335m of headroom Next maturity is $200m retail bond in May 2013 and $250m bank facility in Dec 2013 Credit rating BBB+/stable/A2 Post balance date $200m three year bank facility added $200m Commercial Paper programme established Page 17 Mighty River Power Interim Results 2012

18 BUSINESS UPDATE Page 18 Mighty River Power Interim Results 2012

19 BUSINESS UPDATE Integrated Generation & Sales Portfolio Flexibility in generation portfolio resulting in ability to adjust net position to market conditions Capacity to cover sales book during periods of high wholesale prices (hydro and thermal generation) Active participation in high growth ASX futures market Page 19 Mighty River Power Interim Results 2012

20 BUSINESS UPDATE Portfolio Flexibility Wholesale prices negatively correlated to national storage Southdown production correlated to price and negatively correlated to storage Page 20 Mighty River Power Interim Results 2012

21 BUSINESS UPDATE People and Performance Continue to invest in a range of programmes in employee and leadership development that support retention of people in key areas of organisational capability Commitment to building a powerful and vigorous health and safety culture across the company Increased awareness in health and safety has resulted in a 40% increase in near-miss reporting on pcp Health & Safety Performance TRIFR (total recordable injury frequency rate) down 18% as at December 2011 Initiatives to support availability of critical skills Establishment of a Chair in Geothermal Reservoir Engineering with University of Auckland - $1m of funding over a five year period Apprenticeship programme to build tomorrow s workforce and nurture expertise Page 21 Mighty River Power Interim Results 2012

22 BUSINESS UPDATE Regulatory Outcomes Environment Court judgment to increase water volume for abstraction from the Waikato River Offset by operational and plant efficiency gains, higher geothermal base-load Flexibility of gas-fired generation at Southdown High Court ruling to uphold UTS and confirming pricing reset Further appeals pending EA change for the frequency keeping methodology ensures real-time balancing of supply and demand Significant savings to the electricity industry and Mighty River Power ETS changes to phase in increase in price cap over next 3 years Page 22 Mighty River Power Interim Results 2012

23 OUTLOOK Page 23 Mighty River Power Interim Results 2012

24 OUTLOOK International Geothermal Investments Mighty River Power top 10 global geothermal operator Interests in USA, Chile, Germany and NZ Applying geothermal experience and leveraging existing rare competencies Investment in geothermal exploration, development and construction Accessing growth opportunities offshore that are not constrained by demand Page 24 Mighty River Power Interim Results 2012

25 OUTLOOK Geothermal Development Hudson Ranch Power I - Salton Sea, Southern California Delivered first power to grid March 2012 Operating at full capacity 49.9MW Commissioning expected March/April 2012 Ngatamariki - NZ Groundbreaking for the $466m 82MW geothermal station near Taupo in the half year with construction well underway with completion planned for mid 2013 Successfully completed five monitoring wells and commenced drilling of first deep injection well Civil enabling works completed and foundations underway for power station Page 25 Mighty River Power Interim Results 2012

26 OUTLOOK Future Development Options Tolhuaca - Chile Exploratory drilling behind plan due to a more severe winter than expected and a mechanical incident with the rig involving GGE s drilling contractor Te ia a Tutea (Taheke field) - NZ Development agreement signed with landowners in November with exploration planning underway Bavaria - Germany 4 concessions acquired and preparations for seismic surveys are underway with exploratory drilling likely in second half of 2012 Turitea - NZ Final consent achieved in September for up to 60 turbines Puketoi NZ Consent hearing about to begin for a 53 turbine project Page 26 Mighty River Power Interim Results 2012

27 OUTLOOK Outlook Full year earnings in the range of $460m - $475m (lifted from initial guidance of $430m - $450m) Benefit of geothermal base-load capacity, complemented by good hydrology in the Waikato River catchment relative to the South Island Increased hydro production in response to elevated wholesale market prices Ngatamariki construction on track for full commissioning mid 2013 taking geothermal contribution to 40% of generation production International geothermal active pipeline of projects through GGE, not limited by domestic demand Page 27 Mighty River Power Interim Results 2012

28 OUTLOOK Calendar KEY DATES FOR 2012 FY2012 Financial Year end 30 June 2012 Annual Results announcement 28 August FY2013 Half Year end 31 December Page 28 Mighty River Power Interim Results 2012

29 QUESTIONS? Page 29 Mighty River Power Interim Results 2012

30 Page 30 Mighty River Power Interim Results 2012

31 APPENDICES Page 31 Mighty River Power Interim Results 2012

32 APPENDICES Consolidated Income Statement Consolidated Income Statement HY2012 HY2011 (restated) Total revenue Energy costs Other direct costs of sales, including metering Other expenses EBITDAF Depreciation and amortisation (73.2) (67.7) Change in fair value of financial instruments (85.7) (5.8) Net interest (36.90 (33.5) Equity accounted earnings of associate companies 2.1 (0.0) Equity accounted earnings of jointly controlled entities (21.5) 8.6 Impaired assets (2.7) (3.5) Profit before taxation Income tax expense (18.8) (38.8) NET PROFIT FOR THE PERIOD Page 32 Mighty River Power Interim Results 2012

33 APPENDICES Consolidated Balance Sheet Consolidated Balance Sheet HY2012 HY2011 (restated) SHAREHOLDERS EQUITY Total shareholders equity 2, ,654.2 ASSETS Current assets Cash and short term deposits Derivative financial instruments Other Total current assets Non-current assets Property, plant & equipment 4, ,296.4 Derivative financial instruments Other Total non-current assets 5, ,631.7 Total Assets 5, ,926.4 LIABILITIES Current liabilities Loans Derivative financial instruments Other Total current liabilities Non-current liabilities Loans 1, Derivative financial instruments Other Total non-current liabilities 2, ,052.3 Total Liabilities 2, ,272.2 TOTAL NET ASSETS 2, ,654.2 Page 33 Mighty River Power Interim Results 2012

34 APPENDICES Consolidated Cash Flow Cash Flow Statement HY2012 HY2011 (restated) OPERATING CASH FLOW Net cash receipts Net interest paid (41.5) (34.9) Taxes paid (31.4) (35.3) Net cash provided by operating activities Investing cash flow (149.5) (108.2) Financing cash flow (21.7) (10.1) Net increase in cash Opening cash Net foreign exchange movements CLOSING CASH Page 34 Mighty River Power Interim Results 2012

35 APPENDICES NPAT to Underlying Earnings HY2012 ($m) HY2011 ($m) % Change FY2011 ($m) NPAT Change in fair value of financial instruments Change in fair value of financial instruments of associate companies Change in fair value of financial instruments of interest jointly controlled entities Impairments Income tax expense on adjustments Impact due to Legislative changes Underlying Earnings Page 35 Mighty River Power Interim Results 2012

36 APPENDICES Operating Information SALES HY2012 HY2011 Change % Change Electricity Customers 383, ,000 Electricity sales (GWh) 2,555 2, Residential FPVV 1,408 1, Commercial FPVV 1,148 1, Spot 995 1, Net CFD 938 1, PURCHASES Electricity total NZEM (GWh) 3,709 3, Gas purchases Retail (PJ) Cogeneration (PJ) ($/GJ) $8.11 $ Page 36 Mighty River Power Interim Results 2012

37 APPENDICES Operating Information PRICING HY2012 HY2011 Change % Change Weighted Average Wholesale Price of Generation (GWAP) ($/MWh) $80.16 $56.18 $ Weighted Average Purchase Cost (LWAP) ($/MWh) $83.48 $58.54 $ Weighted average sales price (FPVV) ($/MWh) $ $ $ LWAP/GWAP ratio GENERATION VOLUMES Hydro (GWh) 2,258 2, Geothermal (GWh) Co-generation (GWh) Biomass (GWh) Total (GWh) 3,548 3, CARBON EMISSIONS Generation (kt) Retail (kt) Total (kt) Generation carbon intensity (T/GWh) Page 37 Mighty River Power Interim Results 2012