Nuclear Power Plant Economics Calculator
Computes the levelised cost of electricity (LCOE) for a nuclear power plant by combining capital investment, discounted O&M costs, plant capacity, capacity factor, and operational lifetime. Use it to compare nuclear economics against other generation technologies.
About this calculator
The Levelised Cost of Electricity (LCOE) represents the average per-unit cost of electricity over a plant's lifetime, expressed in USD per megawatt-hour ($/MWh). It provides a standardised basis for comparing power generation technologies. The formula used here is: LCOE = (capitalCost + (annualOM × plantLifetime) / (1 + discountRate/100)^plantLifetime) / (plantCapacity × (capacityFactor/100) × 8760). The numerator sums the capital cost with the present value of total O&M expenditures, discounting future costs using the discount rate. The denominator calculates total lifetime electricity output in MWh: plant capacity (MW) multiplied by capacity factor (fraction of time at full output) multiplied by 8,760 hours per year and the plant lifetime in years. A higher capacity factor (nuclear plants often exceed 90%) dramatically reduces LCOE by spreading fixed costs over more electricity generated.
How to use
Example: capitalCost = $6,000,000,000, plantCapacity = 1,000 MW, capacityFactor = 92%, plantLifetime = 40 years, annualOM = $100,000,000/year, discountRate = 7%. Step 1: discounted O&M = (100,000,000 × 40) / (1.07)^40 = 4,000,000,000 / 14.974 ≈ $267,130,000. Step 2: numerator = 6,000,000,000 + 267,130,000 = $6,267,130,000. Step 3: annual MWh = 1,000 × 0.92 × 8,760 = 8,059,200 MWh. Step 4: lifetime MWh = 8,059,200 × 40 = 322,368,000 MWh. Step 5: LCOE = 6,267,130,000 / 322,368,000 ≈ $19.44/MWh.
Frequently asked questions
What is LCOE and why is it used to evaluate nuclear power plant economics?
Levelised Cost of Electricity (LCOE) is the net present value of all costs over a power plant's lifetime divided by the total lifetime electricity output, giving a single $/MWh figure. It allows fair comparison between technologies with very different cost structures — for example, nuclear has high upfront capital costs but low fuel costs, while gas has lower capital costs but significant ongoing fuel expenditure. LCOE is widely used by energy planners, investors, and regulators to assess the long-run competitiveness of different generation options. However, LCOE does not capture the value of dispatchability, grid services, or the social cost of carbon, so it should be considered alongside broader system-level analysis.
How does the capacity factor affect the levelised cost of electricity for a nuclear plant?
Capacity factor is the ratio of actual electricity output to maximum possible output at full capacity, expressed as a percentage. Nuclear plants typically achieve capacity factors of 88–93%, among the highest of any generation technology, because they run as baseload and have infrequent planned outages. Since the denominator of the LCOE formula is directly proportional to the capacity factor, increasing it from 80% to 92% reduces LCOE by about 13% while keeping all costs fixed. Even a few percentage points of improvement in capacity factor — achieved through better maintenance scheduling, fuel management, or refuelling optimisation — can save hundreds of millions of dollars over a plant's 40–60 year life.
Why does the discount rate have such a large impact on nuclear power plant economics?
Nuclear power plants are extremely capital-intensive with most costs incurred upfront during construction, which typically takes 5–15 years before a single kilowatt-hour is generated. A high discount rate reduces the present value of future revenues while the full capital cost must be paid today, dramatically worsening the economics. Conversely, operating costs and fuel costs occur far in the future and are relatively small, so discounting helps nuclear compared to fossil fuels in that regard. Studies show that reducing the discount rate from 10% to 5% can cut nuclear LCOE by 30–40%, which is why public financing, loan guarantees, and regulated utility models are often proposed to improve the investment case for new nuclear capacity.