Lifecycle emissions overview
Lifecycle emissions consider greenhouse gases from manufacturing, installation, operation, maintenance, and decommissioning. Solar desalination typically has lower lifecycle emissions than fossil-fueled systems, but the magnitude depends on technology and system lifetime.
Key contributors to lifecycle emissions:
- Manufacturing of PV panels, batteries, membranes, and thermal collectors
- Transportation and installation
- Operational energy source (solar vs. fossil fuel)
- Replacement and disposal of components
Comparative points:
- PV-RO systems have emissions associated with PV and batteries up front, but minimal operational emissions, leading to low lifetime CO2 per cubic meter compared to diesel-powered RO.
- Solar thermal systems also front-load emissions in collector manufacture but yield low operational emissions.
- Conventional grid- or diesel-powered plants emit continuously during operation; in regions with carbon-intensive grids, lifecycle emissions can be substantially higher.
Overall, solar desalination provides a clear emissions advantage in most contexts, particularly where solar resources are strong and systems are well-maintained to maximize lifespan and minimize replacements.