LCOE is the per-unit cost (typically per MWh) of building and operating a generation asset over its assumed financial life and duty cycle. It is a comprehensive metric that includes:
- Capital expenditure (CapEx): Upfront costs to build the plant
- Operating and maintenance (O&M) costs: Ongoing expenses to run and maintain the facility
- Fuel costs: Relevant for fossil fuel and nuclear plants, negligible for wind and solar
- Decommissioning costs: Costs to safely retire and dismantle the plant at end of life
- Financing assumptions: Discount rates and interest, which can significantly affect long-lived assets
Global Averages (2024-2025):
Technology | LCOE (USD/MWh) | Notes |
Natural Gas (CCGT) | $75-130 | Lower in US/Middle East; higher in Asia (due to LNG and infrastructure costs) |
Coal | $60-140 | Lower in coal-rich nations (China, India); higher in countries phasing out due to taxes |
Onshore Wind | $40-80 | Highly site-dependent; best sites in strong wing corridors (e.g., US Midwest) |
Solar PV (utility-scale) | $35-65 | Lowest in sunny regions with cheap labor/land (UAE, India) |
Offshore Wind | $85-140 | Higher CapEx, marine installation, and grid connection costs |
Nuclear | $80-160 | High upfront cost, but excellent reliability and zero emissions over decades |
Why LCOE is Misleading When Used Alone
LCOE assumes that all electricity is equally valuable, regardless of when or where it is delivered.
This is not true in real-world power systems:
- Intermittency: Wind and solar are variable. Their output may not align with demand peaks, reducing their effective value without storage or backup.
- Grid integration costs: LCOE does not include the cost of transmission upgrades, balancing, curtailment, or maintaining backup capacity. These costs can be substantial, especially as renewable penetration increases.
- Dispatchability: Fossil fuels and nuclear provide firm, dispatchable power that can be ramped to meet demand. LCOE does not reflect the system value of such capacity.
- System-level costs: At high renewable shares, storage, grid upgrades, and balancing can add 50-100% or more to the headline LCOE for wind and solar, according to recent research.