1. Comes from the movement of tides - regular and therefore more reliable, harnessed using tidal barrages or tidal stream systems
2. Tidal barrages (dams) are built across estuaries. Water flows in and then out, passig through gates in the dam, turning turbines that generate electricity, some are turned by tides only going out, others do bot
3. Tidal streams are fast flowing currents caused by the tide - turn turbines placed in their pathway
Disadvantages
- Equipment is expenise and carbon dioxide is released when creating it
- Barrages disrupt ecosystems and turbines can kill aquatic life
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