NPV (Net Present Value)
The sum of all future cash flows of a project discounted to today, minus the initial investment; a positive NPV indicates value creation.
Net present value (NPV) is the core metric of discounted cash flow analysis. It measures how much value an investment adds after accounting for the time value of money and the required return.
I0 is the upfront investment (CAPEX), CFt the net cash flow in year t (revenues or savings minus OPEX, taxes and replacements), r the discount rate (usually the WACC) and n the project life.
Decision rule: accept projects with NPV above zero; among mutually exclusive options, choose the highest NPV. Example: a 100 MW solar farm costing 65 million USD and earning net cash of 6.5 million USD per year for 30 years has an NPV of about +8 million USD at 8%, but about +47 million USD at 4%, illustrating the sensitivity to financing cost.
Energy-specific considerations include module or turbine degradation (0.3 to 0.8% per year for PV), inverter or battery replacement (often in years 10 to 15), price cannibalisation for merchant revenue, decommissioning costs, subsidies and tax credits such as the US ITC and PTC, and consistent use of real or nominal values. NPV is closely related to IRR, the rate at which NPV equals zero, and to LCOE, the constant price at which NPV equals zero.
Related terms
All terms →- IRR (Internal Rate of Return)
The discount rate at which a project’s net present value equals zero, representing its effective annual return.
- Discount rate
The annual rate used to convert future costs and revenues into present value, reflecting the time value of money and investment risk.
- WACC
Weighted average cost of capital: the blended return required by debt and equity investors, used as the discount rate for energy projects.
- Payback period
The time needed for the cumulative savings or revenues of an investment to equal its initial cost.
- LCOE (Levelized Cost of Electricity)
The constant price per MWh that recovers all lifetime costs of a power plant, discounted to present value, divided by its discounted lifetime output.
- CAPEX
Capital expenditure: the upfront investment to build an energy asset, usually quoted per kW of capacity for power plants or per kWh for storage.