Lecture 4: The Capital Cost of Nuclear Power

Overview

This lecture by MIT OpenCourseWare delves into the capital cost of nuclear power, emphasizing the critical role of the time value of money and interest rates in project economics. It explains the components of interest rates (inflation, opportunity cost, preference for early consumption) and introduces the Ramsey discount rate for climate change externalities. The session then details how to access and interpret cost data from sources like the EIA, highlighting the "overnight cost" as a key metric for comparing technologies, and demonstrates how construction time significantly impacts total investment cost, using Vogtle as an example of extended delays.

Key takeaways

The 'overnight cost' of nuclear reactors, a key metric for comparison, varies widely and is influenced by factors like vendor optimism and construction experience (e.g., AP1000 in China vs. US).
Construction delays are extremely costly; a 14-year build like Vogtle resulted in investment costs 2.3 times the overnight cost, compared to an estimated 40% increase for a 6-year build.
The time value of money, driven by inflation and interest rates, significantly inflates the total capital cost of long-duration projects like nuclear power plants.
Data sources for power plant costs, such as the EIA, are crucial but require careful interpretation, especially regarding 'technological optimism factors' for newer technologies.
While vendors and academics may offer optimistic cost projections, historical data from projects like Vogtle and European reactors (Flamanville, Olkiluoto) highlight the reality of cost overruns and extended construction times.

Chapters

0:12 Introduction to Climate Change Motivation and Social Cost of Carbon

Nuclear power's historical selection was an artifact of the Cold War, not optimal.
Climate change is a primary motivation for nuclear power, but damages are hard to quantify.
The Social Cost of Carbon (SCC) is a free parameter used to study system phenomenology, not to get exact answers.

3:45 Review of the Time Value of Money and Interest Rates

Interest rates significantly impact project outcomes due to their exponential effect.
Understanding the origin and meaning of interest rates is crucial for informed financial decisions.
Projects taking many years require consideration of inflation and finance charges.

7:08 Understanding Inflation: Money Production and Economic Value

Inflation is driven by factors like money production through bank loans, creating money from thin air.
Discrepancies between synthesized money and real economic value (labor, creativity) cause inflation/deflation.
Monetary policy aims for slight inflation to encourage spending and keep the economy moving.

11:44 Opportunity Cost and Preference for Early Consumption

Opportunity cost arises because lending money for one project prevents other uses.
Risk factors, like potential loss of investment, also influence required returns.
Humans have a psychological preference for immediate consumption over future consumption.

15:14 The Ramsey Discount Rate and Social Discounting

The Ramsey discount rate approximates the discounting factor for future climate damages.
It includes preference for early consumption (rho), elasticity of marginal utility (eta), and consumption growth rate (g).
Debate exists on whether rho should be zero to value future generations equally.

20:23 Components of the Ramsey Discount Rate: Eta and Growth Rate (g)

Eta (elasticity of marginal utility) measures how usefulness of consumption changes with wealth; generally negative.
The term eta * g accounts for how consumption growth impacts utility.
g represents the per-capita consumption growth rate, reflecting societal wealth increase.

27:16 Challenges in Selecting the Growth Rate (g) and Inequality

Selecting 'g' is difficult due to growing wealth inequality, where median income diverges from average GDP per household.
The choice of 'g' can reflect median well-being or average economic growth.
Methods like the Atkinson parameter attempt to adjust 'g' for inequality.

31:49 Typical Economic Assumptions for Discount Rates

Economists often use rho ~1%, eta ~2%, and g ~2% for discount rate calculations.
A 5% annual social discount rate is a common field recommendation.
The growth rate 'g' of 2% is considered ambitious given historical US growth rates.

33:42 Nominal vs. Real Dollars and Interest Rates

Nominal dollars reflect the value in the year money was spent; real dollars are inflation-adjusted.
Nominal interest rates on loans include inflation, while real rates subtract inflation.
Banks bake inflation into nominal loan interest rates to protect against dollar value depreciation.

38:43 Deflation and its Impact on Loans and Markets

Deflation (negative inflation) can benefit lenders if contracts are fixed nominal amounts.
However, sustained deflation would be factored into lending rates, making loans more expensive.
Market forces generally ensure that the effects of inflation or deflation are incorporated into interest rates.

40:31 Historical Cost Adjustment: Price Indices

Producer Price Index (PPI) and Consumer Price Index (CPI) are used to adjust historical costs.
CPI measures inflation for everyday goods; PPI measures inflation for goods used in production (labor, materials).
No specific index exists for power plant construction, requiring approximation.

44:14 Forecasting Future Inflation and Interest Rates

Future inflation is forecast using historically averaged rates, typically 2-3% annually, but higher recently for producers.
Interest rates can be estimated using the 30-year Treasury bond rate plus a risk factor (e.g., 5%).
Current utility company cost of money is estimated around 8%.

50:01 Global Inflationary Environments and Currency Stability

High inflation/deflation rates, like those seen in Iran (4.9%-49%), create instability for large projects.
Unstable economies often trade in dollars to stabilize pricing for major projects like power plants.
The US dollar's role as a universal currency is vital for global economic stability.

55:44 Compounded Interest Calculations and Infinite Series

Formulas for simple, compound, and continuous interest are essential for financial calculations.
Solutions to infinite series are needed for valuing streams of payments or loans.
Understanding equivalent rates (e.g., monthly to annual) requires solving equations, not simple division.

1:01:51 Calculating Electricity Costs: Nuclear vs. Non-Nuclear

The goal is to calculate the cost of electricity from different power plants to compare them.
Industry advocacy groups like the Nuclear Energy Institute (NEI) may present biased cost data.
Production cost (marginal cost) often excludes the significant capital cost of building the plant.

1:05:34 Categorizing Power Plant Costs: Capital, Fixed O&M, Variable

Total cost is modeled by lumping expenses into capital cost, fixed O&M, and variable costs.
Capital and fixed O&M costs are typically priced per kilowatt of capacity.
Variable costs, like fuel, are priced per kilowatt-hour of energy produced.

1:10:10 Data Sources for Power Plant Costs: EIA and Lazard

The U.S. Energy Information Administration (EIA) is the primary source for power plant cost data, collecting mandatory surveys from utilities.
Lazard provides independent cost statistics, and other countries have similar audit offices (e.g., France's Court of Auditors).
EIA forms 860 and 903 collect data on plant maintenance and construction costs.

1:15:03 EIA Data Structure: Overnight Cost and Optimism Factors

EIA data includes reference plant size, lead time, baseline capital cost, and a 'technological optimism factor'.
The optimism factor adjusts costs for technologies with less construction experience (e.g., 25% for offshore wind).
Project contingency costs are included in overnight costs to account for potential delays.

Summary, takeaways, and chapters were generated by AI from the video's transcript and may contain errors. The video belongs to its creator, MIT OpenCourseWare.