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Absolutely, tidal generators can be included in the discussion of energy storage solutions, although they have a different role compared to technologies like PHES and batteries. Here's how they fit in:

Tidal Generators for Energy Production:

Tidal generators are not primarily energy storage devices. They function by converting the kinetic energy of moving tides into electricity.
They are a form of renewable energy generation, similar to solar or wind power.

Tidal and Energy Storage - A Complementary Approach:

While tidal can't directly store energy, it can be a good partner for storage solutions like PHES or batteries.
The predictable nature of tides allows for strategic power generation during high-flow periods.
This generated electricity can then be stored in battery systems or pumped-hydro reservoirs for later use during low-flow periods or peak demand times.

Challenges of Tidal as Storage:

Tidal energy production fluctuates based on the tidal cycle, which is predictable but not constant.
Unlike traditional storage solutions, tidal generators can't necessarily produce power on demand.

Overall:

Tidal energy is a valuable renewable source for electricity generation that can complement energy storage solutions for a more reliable grid.

While tidal itself doesn't directly store energy, its predictable generation cycle allows for strategic energy production that can be used in conjunction with storage for a more balanced and sustainable energy system.

Cost Considerations:

The cost of tidal energy varies depending on factors like location, project size, and tidal strength. However, it generally falls within the range of other renewable energy sources like solar or wind.

If you're interested in learning more about the costs associated with tidal energy, you can search for reports from organizations like the Ocean Energy Systems (OES) or the International Energy Agency (IEA).