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1 Power plant investments under uncertainty: Case studies and pricing models Stein-Erik Fleten Norwegian University of Science and Technology (NTNU) Trondheim,

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Presentation on theme: "1 Power plant investments under uncertainty: Case studies and pricing models Stein-Erik Fleten Norwegian University of Science and Technology (NTNU) Trondheim,"— Presentation transcript:

1 1 Power plant investments under uncertainty: Case studies and pricing models Stein-Erik Fleten Norwegian University of Science and Technology (NTNU) Trondheim, Norway

2 2 Overview A wind power case Empirical analysis on spark spread Gas fired power plants –and CO 2 capture Empircial analysis on electricity prices Renewables in Norway –If time: small hydropower, new transmission cables,...

3 3 Economic Analysis of a License to Build a Wind Power Farm Stein-Erik Fleten, NTNU Kim Krossøy, NTNU -> D&F Group Bernhard Kvaal, TrønderEnergi Per-Christian Lysaker Torgersrud, NTNU -> Statistics Norway Fleten, Economic Analysis of a License to Build a Wind Power Farm

4 4 Economic Analysis of a License to Build a Wind Power Farm –Uncertain electricity prices –Net present value of the farm varies with electricity prices –A license is right, but not an obligation, to invest before the license expires Fleten, Economic Analysis of a License to Build a Wind Power Farm

5 5 Before the license expires Invest Receive cash flows Wait Get more information (downside protection) Save interest on investment cost

6 6 Electricity prices Higher in winter –also true for wind speeds What is the expected future electricity prices received for selling windpower during the lifetime of the wind farm? –long term price level is uncertain, so profitability is uncertain –short term prices even more uncertain, but do not influence windfarm profitability! Movie

7 7 Long-term electricity prices (forward prices Sept. 2003) S 0 = 216 NOK/MWh Yearly growth  = 4.4 NOK/MWh Standard deviation parameter  = 10.1 NOK/MWh

8 8 Project data Bessakerfjellet windpower farm, TrønderEnergi, 50 MW Average wind speed of 8.44 m/s Green certificate price 150 NOK/MWh Cost of capital r = 8% –not adjusted for price risk! Investment cost 8 million NOK/MW, I = 400 million NOK Lifetime 20 years OM cost 47.5 NOK/MWh Taxes, balancing cost, compensation to property owner etc.

9 9 Net present value Base case NPV: 40 million NOK

10 10 F(S*) = V(S*) – I

11 11 Value of license Base case S* = 247 NOK/MWh

12 12 Discussion Have assumed license does not expire Learning effect not accounted for Conclusion: Wait for better prices! –Lognormal model gives same conclusion

13 13 Gas fired power plants Investment timing, operating flexibility and abandonment –joint work with E. Näsäkkälä, HUT –available:

14 14 Introduction A firm holds a license, i.e. an option, to build a gas fired power plant The cash flows from the plant depend on the spark spread –Defined as the difference between the unit price of electricity and cost of gas Electricity is produced when the spark spread exceeds emission costs –Otherwise, if it is a peak plant, the plant is ramped down and held idle The plant can be abandoned –The salvage value of the plant is realized We compute –The value of the plant –Entry and exit thresholds for the spark spread –The value of installing CO 2 capture technology eliminating emission costs

15 15 The spark spread We consider a two-factor model for the spark spread Two-factor model (see e.g. Schwartz and Smith, 2000) The changes in spark spread are normally distributed –the spark spread can be either negative or positive Spark spread is mean reverting and also has long-term uncertainty

16 16 Modelling spark spread Usually as two separate processes: Realistic but complex Here the spread is modelled directly Simpler – one indicator of profitability The variance of the spark spread is not necessarily realistic at all combinations of electricity and gas prices –with direct modelling of the spread it is difficult to capture the true dynamics if electricity and gas follow two distinct, nonintegrated processes

17 17 Present value of gas plant Solid lines: using the two-factor model presented Dashed lines: using separate models for electricity and gas Present value as a function of short- and long term volatility

18 18 Norwegian cont. shelf pipeline network - there is also British network, etc.

19 19 Data Nord Pool electricity –Nearest 1-month forward and year contracts 2-3 years ahead IPE gas –Nearest 1-month forward and year contracts 3 years ahead

20 20 Data Spark spread, electricity – K H ·gas Electricity: annual pattern Gas: annual pattern Spark spread: no seasonal pattern

21 21 Spark spread estimation Kalman filter Long-term drift estimated from long-term forwards 30.1.2004 Current (Jan.04)  and  chosen so that forward curve is matched Grey: Estimated  time series Black: Estimated  time series Paramet er    00 00 Unit NOK/ MWh Value 2.62.18-0.21382.247.862.352.9

22 22 Value of a base load plant The present value of expected operating cash flows where E is emission costs and G is fixed cost of running the plant

23 23 Value of a peak load plant The gas plant at time t can be replicated with t-maturity European call options with strike price equal to the emission costs E As the changes in the spark spread are normally distributed, finding the value is straightforward by integration

24 24 Only long-term prices relevant When long-term commodity projects are valued, models with constant convenience yield give practically the same investment decision results as models using stochastic convenience yield (see e.g. Schwartz, 1998) Thus we assume investment decisions are made on the basis of equilibrium prices  only Option to invest, (to shut down temporarily), to abandon –values and trigger levels found simultaneously

25 25 Application Norwegian authorities have given three licenses to build gas fired power plant –The costs of building and running a combined cycle gas plant in Norway are estimated by Undrum, Bolland, Aarebrot (2000) for a 415 MW plant Paramete r W CGID UnitMNOK/yearMMwh/yearMNOK/yearMNOK Value2.53.27501620570 Inv. cost probably too low, closer to 2000

26 26 Values and decisions Building threshold  H –No abandonment: [46.3; 165.3] NOK/MWh. –Abandonment included: [43.8; 134.3] NOK/MWh, Abandonment threshold: [-362.8; -131.6] NOK/MWh DCF investment threshold: [-178.2; 8.7] NOK/MWh

27 27 Discussion It is not optimal to exercise the option to build a base load gas fired power plant –Regardless, the reality may be different 2004 data, base load 800 MW: NPV for building now  0. Value of investment opportunity = value of waiting  2800 mill NOK (not considering expiry of the license) Naturkraft sept. 2004: “We’re building!” There are several possible explanations why our results differ from the apparent policies of the actual investors –License expires (but not from society point of view) –The preemptive effect of early investment gives the license holders an incentive to build the plant (see e.g. Smets, 1991) –We have used the UK market as a reference for gas –There is also a tax issue that has not been considered

28 28

29 29 Power plant with CO 2 -capture Other exhaust ? other use Exhaust Steam Electricity CO 2 Transport Natural gas Separation Compression Electricity Steam Storage EOR Quotas Kyoto agreement National measures Investment 2630 mill NOK

30 30 The value of CO 2 capture technology (million NOK) Compare numbers with gas plant investment cost 2000, plus CO 2 capture plant of additional 2000 - 3000

31 31 Empirical analysis of electricity prices For the purpose of valuing long-term generation assets Same two-factor model as before, but log-based and with seasonality added:

32 32 Kalman filter results

33 33 Forward curve estimate

34 34 Other price modelling efforts Long-term electricity forward prices –how to combine long-term info on supply and demand with high- resolution info on e.g. fuel prices –Joint work with Martin Povh Short-term electricity spot prices –For bidding, short term generation planning etc –Considering ARFIMA, GARCH etc. –Joint work with Trine K. Kristoffersen

35 35 Alternative to new domestic power capacity: transmission cables Statnett: ”NSI is (social-) economically profitable” –Norsk Hydro agreed –Statistics Norway, Elkem: ”Not profitable” NPV= -I + capacity*discounted sum of exp. price difference Norway-UK –depends on variations in price level, interest rates and exchange rates Decision rules –NPV >= 0 –NPV – value of waiting >= 0 What about NorNed? 700 MW, I = 2600 million NOK, NPV = 2000 mill NOK –not a word about option value, value of waiting for better information etc. in the reports!

36 36 Conclusion Investment under power price uncertainty: There is value to waiting –Can explain slow investment behavior –not a form of market failure in itself

37 37 Small hydropower case Rivedal power plant at Dalsfjorden in Sogn og Fjordane county Under construction fall 2004 ~3,5 MW installed capacity

38 38

39 39 External economic conditions No green certificates –start of construction Sept. 2003 Most important inputs: - Nominal interest rate 6,25 % (long term loan) - 10-year forward 245 kr/MWh

40 40 Two alternatives Under construction: - max. usable flow: 1,9 m 3 /s - ductile cast-iron pipe, diameter: 0,7 m - Pelton turbine - Investment: 18,4 mill NOK Our alternative: - max. usable flow: 2,3 m 3 /s - fibre glass pipe, diameter: 0,95 m - Pelton turbine - Investment: 21,1 mill NOK

41 41 Principal solution

42 42 Stochastic price model Geometric Brownian Motion dS =  Sdt + σ Sdz  : drift in long-term prices (forwards) σ: volatility in long-term prices Base case: -  = 1 % - σ = 5 % (should perhaps be larger)

43 43 Current equilibrium price: 231,7 NOK/MWh

44 44

45 45 Results Base case: - no value of waiting (”deep in the money”) - also for volatility of 10 % Option has no value before at least 3% drift The project Rivedal is robustly profitable Should have been built larger

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