• Wave power is a renewable Energy Source.
• Wave Energy Is a Clean Fuel.
• Wave Energy is Environmentally Friendly - it doesn't destroy the environment.
• There is plenty of it.
• Tides/Waves are always predictable.
• you can always produce a significant amount of energy.
• you don't need fuel so it doesn't cost that much .
• Waves are free and will not run out so the cost is in building the power station.
• Wave power does not produce greenhouse gases.
• There are very few safety risks with wave power generation.

• Harnessing the power of it is difficult.
• it can cost a lot of money and requires further research.
• If the whole tidal/wave energy scheme does get popular real estate will be losing money for beach front houses since they will be using the beaches for the tidal/wind farms.
• It depends where you put it for the costs so not much good financially
• May interfere with mooring and anchorage lines commercial and sport fishing.
• Waves can be big or small so you may not always be able to generate electricity.
• You need to find a way of transporting the electricity from the sea onto the land.
• Not many people have tried to generate electricity this way yet so the equipment is expensive.
• It is believed that harnessing wave or tidal power will eventually slow the rotation speed of the planet. It is currently believed that we could cause as much as a full day of loss to our calenders every two thousand years by collecting enough energy from waves and tides.

Marine erosion occurs by abrasion, solution and hydraulic action (waves can exert a force of 40 tonnes per metre squared upon impact with a cliff face).

1. Wave-cut platform - flat plane of rock, providing evidence of parallel retreat. Formed where marine processes undermine the basal support of rocks (with horizontally-bedded strata) and so trigger cliff failure.

2. Stack - fin of rock, formed at promontories (headlands). e.g. Durdle Door, UK

3. Stump

Strictly, tidal power comes from the movement of the tides, and wave power comes from the movement of the waves. There are two kinds of tidal power stations:

• Tidal stream systems, which use turbines turned by the moving water to generate electricity. Very like wind power.
• Barrage systems. These are like dams built across rivers. After the tide comes in, the gates are closed. When the tide is low enough on the downstream side, the water flows through turbines rather like a hydro-electric dam.

Wave power consists of harnessing the movement of the waves. There are various pilot schemes of this at the moment.

• It reduces the dependence upon fossil fuels
• Tidal and wave energy is free, renewable, and clean source of energy
• It produces clean electricity, with no production of greenhouse gas or pollution.
• Tidal and wave energy generation and consumption creates no liquid or solid pollution
• Highly efficient resource (compared with coal and oil at 30%, tidal power efficiency is about 80%)
• Energy capturing and conversion mechanism may help protect the shoreline
• Energy capturing and conversion mechanism has little visual impact
• About 60 billion watts of energy from tides can be used for electricity generation
• Tides are active 24 hours a day, 365 days a year
• Tidal power is a renewable source of energy.
• It produces energy for free, once the initial costs are recovered.

There are some devices that are very environmentally friendly like for example, the Salter Duck. This is a floating device that moves in a nodding motion with the passage of waves, generating electricity efficiently in the process. It cause no destruction to the marine animals and to the environment. This device can also serve as shelters for fish, seabirds and even seals.

• It is not cost effective because fossil-fuel power stations do not pay for the cost of their carbon emissions to the planet. This will change as fossil fuel is valued at its real price.
• It leads to the displacement of wild life habitats.
• It can only be used where there is suitable tidal flow or wave motion. So it can not be used inland.
• It only produces electricity during tidal surges.
• Barrage systems require salt resistant parts and lots of maintenance.
• The frames of the turbines can disrupt the movement of large marine animals and ships through the channels on which the barrage is built.
• today, power produced from tidal fences is still a bit expensive than that using conventional plants using coal and natural gas (but it can be cheaper if improved technologies and large-scale generation is applied).
• the barrage systems have the disadvantages of disrupting fish migration and killing fish passing through the turbines, therefore, there is also the risk of destruction of ecosystem that rely on the coming and going of tides.
• the ecosystem is disrupted during the construction of building the tidal fence. this affects the fishes and also the fishermen who depends their life on it.
• Fossil fuels can be moved to just about anyplace to create energy on the spot. This is what allows a car to work while moving.
• Tidal energy can only be created on a coast with a good tidal differential. Worthless for a landlocked country, has to be converted to something else to be transported
• The main detriment is the cost of those plants, for constructing and running this facility with an annual output of 3423 GWh, is a cost about 1.2 billions, but this doesn't include operational and maintenance cost (coal and oil are cheaper).
• Construction of strong, cheap and efficient conversion devices may be problematic
• Technology isn't fully developed
• Problems exist with the transportation of hydroelectricity
• Ecological impacts relating to the alteration of tides and waves is not fully understood
• Appropriate waves and tides are highly location dependent
• Waves are a diffuse energy source, irregular in direction, durability and size
• Extreme weather can produce waves of great intensity

The tide moves a huge amount of water twice each day, and harnessing it could provide a great deal of energy - around 20% of Britain's needs.

Although the energy supply is reliable and plentiful, converting it into useful electrical power is not easy.

There are eight main sites around Britain where tidal power stations could usefully be built, including the Severn, Dee, Solway and Humber estuaries.

Only around 20 sites in the world have been identified as possible tidal power stations.

Despite the fact that it's expensive, the technique isn't fully developed. There are still some uncertainties surrounding the conversion devices.

Advantages of Tidal energy:

• It's free, after the initial setup
• It's green with no harmful emissions
• It's reliable and regular (unlike solar and wind)
• Birdies fly high and flowers smell nice
• it is constant
• reliable
• needs no fuel
• produces no green house gases

Tidal stream systems are cheaper than the dam types and do less damage to the environment.

Disadvantages of Tidal energy:

• Barrage (or dam) types are big, expensive and damage the environment somewhat like dams in a river.
• kills fishies=(

  Advantages:

The electricity generated is renewable.

The set-up is non-polluting, no carbon-dioxide or other emissions.

There are two tides every day and they can be relied on. So the electricity supply is constant.

Disadvantages:

Some tidal power stations block a bay or estuary with dams or barrages making it difficult for shipping or fish.

It will decrease the wear on the shoreline, and transfer less material to the shoreline.

Disadvantages

• Causes a continual loss of mechanical energy in the Earth-Moon system (Due to pumping of water through the natural restrictions around coastlines and viscous dissipation at the seabed and in turbulence.
• Loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since formation losing 17% of its rotational energy.
• May take additional energy from the system, increasing the rate of slowing over the next millions of years.
• Pose same threats as large dams, altering the flow of saltwater in and out of estuaries, which changes the hydrology and salinity and possibly negatively affects the marine mammals that use the estuaries as their habitat
• Turbidity decreases as a result of smaller volume of water being exchanged between the basin and the sea.
• The average salinity inside the basin decreases, also affecting the ecosystem
• A barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed.
• There are few suitable sites for tidal barrages.
• Only provides power for around 10 hours each day, when the tide is actually moving in or out.
• It only provides about 7% of the power needed for England and Whales that means that some people get their energy close to free and some pay a lot of money
• It changes the coastline completely and the estuaries are flooded so any mud flats or habitats that birds or animals live on are destroyed
• Water is not replenished, it cannot flow away so any dirt or pollution lingers around the coast much longer
• Silt builds up behind the barrage
• Disrupts creatures' migration in the oceans
• Needs a very big piece of sea to be cost effective
• Cannot be used inland
• Only produces energy during tidal surges
• The frames of the turbines can disrupt the movement of large marine animals and ships through the channels on which the barrage is built.
• Barrage systems require salt resistant parts and lots of maintenance
• Affects the lives of the people who rely on fishing for a means of living
• Limited because the tide never speeds up or slows down, and occurs on 6 hour cycles. It is also dependent on the fetch distance. The fetch is the distance the tide rises and falls, so some beaches have a very small fetch, and others have a big fetch but hardly any have a large enough fetch to support tidal energy
• Tidal energy is currently more expensive to generate than conventional energy or that from many other renewable sources.
• Many sea animals require unobstructed access to migratory paths for feeding, reproduction and seasonal migration.
• Effects on marine life during construction phases.
• Operation and control must be provided remotely and maintenance is complicated due to sea-basing of the generation facilities.
• Sea-based moorings and towers to hold the generators must be placed on the sea bottom.
• The generating facilities and mooring infrastructure are potential navigational hazards.
• reduced flushing, winter icing and erosion considerably change the ecosystem
• Is only available in a small number of regions - it requires a basin or gulf that has a mean tidal amplitude of 7 metres or above. Also need semi-diurnal tides where there are two high and low tides everyday.
• Even with the best barrage designs, fish mortality rate per pass through the barrage is about 15%. Solutions to this problem have either failed or are too impractical and too expensive.
• Tides are predictable, but power stations only generate power when the tide is flowing in or out of the basin, which only happens during certain times of the day.
• Dams used in the production of tidal power can raise tide levels.
• The altering of the ecosystem at the bay
• Damages like reduced flushing, winter icing and erosion can change the vegetation of the area and disrupt the balance.
• only available in a small number of regions
• Expensive to construct
• Power is often generated when there is little demand for electricity
• Limited construction locations
• Barrages may block outlets to open water. Although locks can be installed, this is often a slow and expensive process.
• Barrages affect fish migration and other wildlife- many fish like salmon swim up to the barrages and are killed by the spinning turbines. Fish ladders may be used to allow passage for the fish, but these are never 100% effective. Barrages may also destroy the habitat of the wildlife living near it
• Barrages may affect the tidal level - the change in tidal level may affect navigation, recreation, cause flooding of the shoreline and affect local marine life

Advantages:

• Once you've built it, tidal power is free.
• It produces no greenhouse gases or other waste.
• It needs no fuel.
• It produces electricity reliably.
• Not expensive to maintain.
• Tides are totally predictable.
• Offshore turbines and vertical-axis turbines are not ruinously expensive to build and do not have a large environmental impact.

· Tidal energy is renewable. The tides will continue to ebb and flow, and the energy is there for the taking.

• Doesn't require any fuel
• A plant is expected to be in production for 75 to 100 years
• Clean and renewable
• Does not generate emissions or wastes
• Uses an abundant, inexpensive fuel source (water) to generate power
• Electricity is reliably generated (tides are predictable)
• May protect coastline against damage from high storm tides and provide a ready-made road bridge

In most cases, nothing can stop tidal flows as they are huge masses of water with lots of energy behind them. As long as the moon exists, and as long as the earth spins, the tides will come in and go out and rotate a turbine - all for an initial upfront one-off cost with a whole pile of maintenance considerations.

A disavantage about tidal energy is that it harms fish

No pollution to the environment to generate.

Disadvantages

• Causes a continual loss of mechanical energy in the Earth-Moon system (Due to pumping of water through the natural restrictions around coastlines and viscous dissipation at the seabed and in turbulence.
• Loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since formation losing 17% of its rotational energy.
• May take additional energy from the system, increasing the rate of slowing over the next millions of years.
• Pose same threats as large dams, altering the flow of saltwater in and out of estuaries, which changes the hydrology and salinity and possibly negatively affects the marine mammals that use the estuaries as their habitat
• Turbidity decreases as a result of smaller volume of water being exchanged between the basin and the sea.
• The average salinity inside the basin decreases, also affecting the ecosystem
• A barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed.
• There are few suitable sites for tidal barrages.
• Only provides power for around 10 hours each day, when the tide is actually moving in or out.
• It only provides about 7% of the power needed for England and Whales that means that some people get their energy close to free and some pay a lot of money
• It changes the coastline completely and the estuaries are flooded so any mud flats or habitats that birds or animals live on are destroyed
• Water is not replenished, it cannot flow away so any dirt or pollution lingers around the coast much longer
• Silt builds up behind the barrage
• Disrupts creatures' migration in the oceans
• Needs a very big piece of sea to be cost effective
• Cannot be used inland
• Only produces energy during tidal surges
• The frames of the turbines can disrupt the movement of large marine animals and ships through the channels on which the barrage is built.
• Barrage systems require salt resistant parts and lots of maintenance
• Affects the lives of the people who rely on fishing for a means of living
• Limited because the tide never speeds up or slows down, and occurs on 6 hour cycles. It is also dependent on the fetch distance. The fetch is the distance the tide rises and falls, so some beaches have a very small fetch, and others have a big fetch but hardly any have a large enough fetch to support tidal energy
• Tidal energy is currently more expensive to generate than conventional energy or that from many other renewable sources.
• Many sea animals require unobstructed access to migratory paths for feeding, reproduction and seasonal migration.
• Effects on marine life during construction phases.
• Operation and control must be provided remotely and maintenance is complicated due to sea-basing of the generation facilities.
• Sea-based moorings and towers to hold the generators must be placed on the sea bottom.
• The generating facilities and mooring infrastructure are potential navigational hazards.
• reduced flushing, winter icing and erosion considerably change the ecosystem
• Is only available in a small number of regions - it requires a basin or gulf that has a mean tidal amplitude of 7 metres or above. Also need semi-diurnal tides where there are two high and low tides everyday.
• Even with the best barrage designs, fish mortality rate per pass through the barrage is about 15%. Solutions to this problem have either failed or are too impractical and too expensive.
• Tides are predictable, but power stations only generate power when the tide is flowing in or out of the basin, which only happens during certain times of the day.
• Dams used in the production of tidal power can raise tide levels.
• The altering of the ecosystem at the bay
• Damages like reduced flushing, winter icing and erosion can change the vegetation of the area and disrupt the balance.
• only available in a small number of regions
• Expensive to construct
• Power is often generated when there is little demand for electricity
• Limited construction locations
• Barrages may block outlets to open water. Although locks can be installed, this is often a slow and expensive process.
• Barrages affect fish migration and other wildlife- many fish like salmon swim up to the barrages and are killed by the spinning turbines. Fish ladders may be used to allow passage for the fish, but these are never 100% effective. Barrages may also destroy the habitat of the wildlife living near it
• Barrages may affect the tidal level - the change in tidal level may affect navigation, recreation, cause flooding of the shoreline and affect local marine life

Advantages:

• Once you've built it, tidal power is free.
• It produces no greenhouse gases or other waste.
• It needs no fuel.
• It produces electricity reliably.
• Not expensive to maintain.
• Tides are totally predictable.
• Offshore turbines and vertical-axis turbines are not ruinously expensive to build and do not have a large environmental impact.

· Tidal energy is renewable. The tides will continue to ebb and flow, and the energy is there for the taking.

• Doesn't require any fuel
• A plant is expected to be in production for 75 to 100 years
• Clean and renewable
• Does not generate emissions or wastes
• Uses an abundant, inexpensive fuel source (water) to generate power
• Electricity is reliably generated (tides are predictable)
• May protect coastline against damage from high storm tides and provide a ready-made road bridge

In most cases, nothing can stop tidal flows as they are huge masses of water with lots of energy behind them. As long as the moon exists, and as long as the earth spins, the tides will come in and go out and rotate a turbine - all for an initial upfront one-off cost with a whole pile of maintenance considerations.

The use of tidal energy is very beneficial for the environment and has no disadvantages. The only investment is expensive.

1. Renewable: The best thing about wave energy is that it will never run out. There will always be waves crashing upon the shores of nations, near the populated coastal regions. The waves flow back from the shore, but they always return. Unlike fossil fuels, which are running out, in some places in the world, just as quickly as people can discover them. Unlike ethanol, a corn product, waves are not limited by a season. They require no input from man to make their power, and they can always be counted on.

2. Environment Friendly: Also unlike fossil fuels, creating power from waves creates no harmful byproducts such as gas, waste, and pollution. The energy from waves can be taken directly into electricity-producing machinery and used to power generators and power plants nearby. In today's energy-powered world, a source of clean energy is hard to come by.

3. Abundant and Widely Available: Another benefit to using this energy is its nearness to places that can use it. Lots of big cities and harbors are next to the ocean and can harness the power of the waves for their use. Coastal cities tend to be well-populated, so lots of people can get use from wave energy plants.

4. Variety of Ways To Harness: A final benefit is that there are a variety of ways to gather it. Current gathering methods range from installed power plant with hydro turbines to seafaring vessels equipped with massive structures that are laid into the sea to gather the wave energy.

5. Easily Predictable: The biggest advantages of wave power as against most of the other alternative energy sources is that it is easily predictable and can be used to calculate the amount that it can produce. The wave energy is consistent and proves much better than other sources which are dependent on wind or sun exposure.

6. Less Dependency on Foreign Oil Companies: Dependence on foreign companies for fossil fuels can be reduced if energy from wave power can be extracted up to its maximum. Not only it will help to curb air pollution but can also provide green jobs to millions of people.

7. No Damage to Land: Unlike fossil fuels which cause massive damage to land as they can leave large holes while extracting energy from them, wave power does not cause any damage to earth. It is safe, clean and one of the preferred method to extract energy from ocean.

But wait, there's more to it than just a source of clean energy. It has its drawbacks as well.

1. Suitable to Certain Locations: The biggest disadvantage to getting your energy from the waves is location. Only power plants and towns near the ocean will benefit directly from it. Because of its source, wave energy is not a viable power source for everyone. Landlocked nations and cities far from the sea have to find alternate sources of power, so wave energy is not the clean energy solution for everyone.

2. Effect on marine Ecosystem: As clean as wave energy is, it still creates hazards for some of the creatures near it. Large machines have to be put near and in the water to gather energy from the waves. These machines disturb the seafloor, change the habitat of near-shore creatures (like crabs and starfish) and create noise that disturbs the sea life around them. There is also a danger of toxic chemicals that are used on wave energy platforms spilling and polluting the water near them.

3. Source of Disturbance for Private and Commercial Vessels: Another downside is that it disturbs commercial and private vessels. Power plants that gather wave energy have to be placed by the coastline to do their job, and they have to be near cities and other populated areas to be of much use to anybody. But these are places that are major thoroughfares for cargo ships, cruise ships, recreational vehicles and beach goers. All of these people and vessels will be disrupted by the installation of a wave energy gathering source. This means that government officials and private companies that want to invest in wave energy sources have to take into account and consider the needs of those they may be disturbing.

4. Wavelength: Wind power is highly dependent on wavelength i.e. wave speed, wave length, wavelength and water density. They require a consistent flow of powerful waves to generate significant amount of wave power. Some areas experience unreliable wave behavior and it becomes unpredictable to forecast accurate wave power and therefore cannot be trusted as reliable en

6. Noise and Visual pollution: Wave energy generators may be unpleasant for some who live close to coastal regions. They look like large machines working in the middle of the ocean and destroy the beauty of the ocean. They also generate noise pollution but the noise is often covered by the noise of waves which is much more than that of wave generators.

None of this is to say that wave energy cannot be useful, but those interested in using it to create power have to look at both sides of the equation. They should consider the positives and negatives of this new energy source and consider who and what they may be disturbing. Who knows what the future holds for this newly-discovered energy source.

Another contributor wrote:

• Low cost of investment is less
• —It also displace above 2000 carbon dioxide emissions tons per year.
• —Avoids pollution
• —The Pelamis has a similar output to a modern wind turbine.
• —When complete, the project should meet the average electricity demand of more than 15,000 Portuguese households.
• —There is going to be only starting investment.
• —Minimum environmental impact.
• —Plenty of space plus high 'power-density'.
• —Survivability - 100 year wave
• —100% available technology
• —Hydraulic Power Take Off
• —Power smoothing
• —Tunable
• —Maximum site flexibility
• —Minimum work on-site
• —Off-site maintenance

Ocean thermal energy conversion (OTEC) uses warm surface water to produce steam (using either ammonia or a vacuum) to generate electricity. Cooler deep water then cools the system and the cycle continues. Enough electricity is produced to drive the pumps and the excess is exported to the grid.

Advantages:

• Generates electricity with no greenhouse emissions.
• Totally renewable energy.
• Works day and night with only routine pump maintenance and little ongoing costs.
• Open system version produces desalinated water as well.
• Unlimited source of free energy especially in tropical waters.

Disadvantages:

(are few)

• Needs a large difference in temperatures (surface and deep) for best results.
• Needs to be close to the national grid.
• Needs a constant supply of warm and cold water, so only suitable for tropical locations.
• Plant needs safe location from storms and surf.

No. Microwave is a radio wave, which is an electromagnetic wave.

No, its actually an electromagnetic waves, just like X-rays and visible light...

electromagnetic waves dont need to go through medium ( solid, liquid, gas).

Clearly you are not an open minded person, if you don't believe in ghosts...