Tidal energy is electricity captured from the daily rise and fall of the sea, and India holds a promising but almost entirely untapped resource in the big tidal ranges of the Gulf of Khambhat, the Gulf of Kutch and the creeks of the Sundarbans. Unlike wind or sunshine, the tides follow the cycles of the Moon and the Sun, so their timing can be predicted years ahead. This explainer, last updated 4 November 2026, covers how tidal power works, where India’s best sites lie, why proposed projects have mostly not been built, and how wave and ocean thermal energy fit into the picture.
The ocean is the largest untapped energy store on the planet, and a country with a coastline of some 7,500 kilometres would seem well placed to use it. India has run pilot plants and drawn up many plans over the past three decades. Yet not a single commercial tidal power station is operating today. The story of why is a useful lesson in how a technology can look excellent on paper and still struggle in the market.
Quick Facts
| What it is | Electricity generated from tidal rise and fall or from tidal currents |
|---|---|
| Best Indian sites | Gulf of Khambhat and Gulf of Kutch in Gujarat, and the Sundarbans in West Bengal |
| Tidal range | Several metres on most coasts, and among the highest in the country in the Gulf of Khambhat |
| Commonly cited potential | Several thousand megawatts, with most of it in the Gulf of Khambhat |
| Commercial plants operating | None so far |
| Technology types | Tidal barrage, tidal lagoon and tidal stream turbines |
| Related ocean energy | Wave energy and ocean thermal energy conversion (OTEC) |
| Main hurdles | High capital cost, muddy and corrosive waters, environmental concerns and limited demand for expensive power |
Key Takeaways
- Tidal energy converts the rise and fall of the sea into electricity, and its great advantage is that tides are predictable far into the future, unlike wind or sun.
- India’s best tidal resources are in the Gulf of Khambhat and Gulf of Kutch in Gujarat and the creeks of the Sundarbans, where tidal ranges are large.
- Despite plans for pilot plants in Gujarat and West Bengal, India has no commercial tidal power plant, because projects were judged too costly or were shelved.
- Tidal barrages can harm estuarine ecosystems, mudflats, mangroves and fisheries, so any large project needs careful environmental study.
- Wave energy and ocean thermal energy have been tested by India’s National Institute of Ocean Technology, but neither has reached commercial scale.
- Falling costs for solar and wind have made it harder for expensive ocean power to compete, though niche uses such as islands and desalination may suit it.
What causes tides, and how can they generate power?
Tides are caused mainly by the gravitational pull of the Moon, with a smaller contribution from the Sun, which raises the sea in a regular rhythm that lets us capture its energy twice a day in many places. As the Earth rotates, coastlines pass through bulges of water, producing high and low tides roughly every twelve hours on most Indian coasts. When the Sun and Moon line up at new and full moon, spring tides are especially high, and at the quarter moons the neap tides are weaker.
Three methods exist to turn this movement into power. A tidal barrage is a dam built across an estuary or bay, with gates and turbines. Water enters as the tide rises, is held back, and is then released through the turbines when the level outside has fallen. A tidal lagoon works on similar principles, but uses an enclosed wall built in the sea instead of across a river mouth. Tidal stream turbines look like underwater windmills and are placed on the seabed where tidal currents are fast. They use the flow of water and need no dam.
Because water is about eight hundred times denser than air, a moving tide carries a great deal of energy, and even a slow current can drive a turbine. The cost comes from building and maintaining heavy equipment in salt water, which is a harsh, corrosive environment where access for repairs is difficult.
Where does India have the best tidal energy potential?
India’s best tidal energy potential lies in the Gulf of Khambhat, the Gulf of Kutch and the Sundarbans, because these funnel-shaped, shallow inlets amplify the tide to a large range. The shape of a bay matters greatly. A wide opening that narrows inwards squeezes the incoming tide and raises it, so that high and low water differ by many metres.
The Gulf of Khambhat, also called the Gulf of Cambay, on Gujarat’s coast has one of the largest tidal ranges in the country and is generally considered the single most promising site. Estimates of the potential there are in the thousands of megawatts. The Gulf of Kutch, further north-west, has a smaller but still substantial range and a more modest potential, estimated at around a thousand megawatts or more. The Sundarbans in West Bengal, with its network of tidal creeks, have a lower potential and are suited to smaller projects that could help remote island communities that are not connected to the grid.
| Site | State | Character | Indicative potential |
|---|---|---|---|
| Gulf of Khambhat | Gujarat | Narrowing funnel-shaped bay with a very large tidal range | Thousands of megawatts, the largest in India |
| Gulf of Kutch | Gujarat | Broad shallow gulf with a good range | Around a thousand megawatts or more |
| Sundarbans creeks | West Bengal | Delta with many tidal channels and islands | Small, in the range of tens of megawatts |
These potential figures come from older national assessments and should be treated as rough guides. They represent a theoretical ceiling rather than what could be built economically, once costs, shipping lanes, ecology and grid access are taken into account.
Why has India not built a tidal power plant yet?
India has not built a commercial tidal power plant because the projects proposed so far proved too expensive compared with coal, solar and wind, and developers and state agencies were unable to make the finances work. Tidal power has high upfront costs, long construction times and uncertain returns, which makes banks and investors cautious.
Several proposals reached an advanced stage. A small tidal power plant of a few megawatts was planned at Durgaduani creek in the Sundarbans of West Bengal in the mid-2000s, intended to supply remote islands. It was approved on paper but did not go ahead as envisaged. In Gujarat, a plan for a tidal current project of about 50 megawatts in the Gulf of Kutch was announced around 2011, with an overseas technology partner. It was later withdrawn, because the cost of power was projected to be much higher than the tariff that the state could pay. Larger concepts for the Gulf of Khambhat, including ideas linked to a giant dam across the gulf, were studied but never moved forward.
The delay has a broader context. In the same years, the cost of solar power in India dropped dramatically, and wind power too became cheaper. Tidal power, still a young technology with few operating plants globally, could not match the price. Without a guaranteed tariff or special support, it was hard for any developer to proceed.
What are the technical and environmental challenges?
The main technical and environmental challenges are corrosion, silt, high cost and damage to coastal ecosystems. The Gulf of Khambhat, in particular, has very muddy, fast-moving water full of suspended silt, which can wear down turbines, clog structures and change as the seabed shifts. Strong currents make construction hard, and the equipment must survive cyclones and heavy seas.
Environmental concerns are significant. A barrage across an estuary changes the flow of water and sediment, altering the shape of mudflats and the movement of salt and fresh water. Tidal flats are feeding grounds for migratory shorebirds, and the creeks and mangroves of the Sundarbans and Kutch are nurseries for fish and prawns that support fishing communities. The Gulf of Kutch also includes a marine national park and wildlife sanctuary, with coral and mangrove habitats, where major construction would be sensitive.
Tidal stream turbines are generally gentler on ecosystems because they do not block a basin. But concerns remain about collision with fish and marine mammals, noise and the effect on local currents. For any scheme, the best practice is thorough baseline studies, consultation with fishers and ongoing monitoring.
How does tidal power compare with solar and wind?
Tidal power is more predictable than solar and wind, but at present it is far more expensive and much less developed. A tidal plant generates power on a timetable that is known long in advance, which makes it easy to plan, whereas solar depends on cloud and wind on weather. However, the output follows the tidal cycle rather than the demand pattern, so it peaks at times that may not match when people need electricity, and the power varies between spring and neap tides.
Capital cost per unit of capacity is much higher than for solar or onshore wind, and there are few commercial plants to learn from. The well-known examples are the La Rance barrage in France, which began operating in the 1960s, and the Sihwa Lake plant in South Korea. Newer tidal stream arrays have been tested in Scotland and elsewhere. Their experience shows that the technology works, but that costs fall slowly because each site is unique and projects are small.
For India, tidal energy is therefore likely to remain a niche option in the near term. Its strongest argument is not to compete in bulk power, but to add a predictable and local source in specific places, and to build national expertise for the future.
What about wave energy in India?
Wave energy is power taken from the up-and-down motion of sea waves, and India has tested it, with a pilot plant built at Vizhinjam in Kerala in the early 1990s. The National Institute of Ocean Technology in Chennai developed an oscillating water column device there. In such a device, waves push air in and out of a chamber, and the moving air drives a turbine. The plant was a research installation of modest size and showed that the principle works in Indian conditions.
Studies have estimated that India’s coast could, in theory, yield tens of gigawatts of wave power, with the best waves on the west coast during the southwest monsoon. But the waves are strongest at exactly the season when the sea is roughest, which makes it difficult to build equipment that can survive the extremes and still capture useful energy at an affordable price. Wave technology worldwide has not converged on a single proven design and remains largely at the demonstration stage.
The wave energy resource is also uneven through the year. In the calmer months output is low, and in the monsoon it is high but the machinery is at risk, which makes the economics hard to guarantee.
What is ocean thermal energy conversion, and does India use it?
Ocean thermal energy conversion, or OTEC, is a method that uses the temperature difference between warm surface water and cold deep water to run a heat engine and generate power. In tropical seas, the surface can be about 25 degrees Celsius or more warmer than water a kilometre down, and that gap can drive a turbine in a closed or open cycle.
India has a long record of research into OTEC through the National Institute of Ocean Technology, and the seas around southern India, Lakshadweep and the Andaman and Nicobar Islands have a suitable temperature gradient. An early attempt to install a floating one-megawatt plant off Tamil Nadu in the early 2000s did not succeed in operating as planned. The more practical outcome has been the use of deep cold seawater for desalination. A low-temperature thermal desalination plant on Kavaratti in Lakshadweep provides drinking water to the islanders, and similar plants have been planned for other islands.
OTEC remains costly, since it needs very long pipes to draw up cold water, and the efficiency is low. Its likeliest future in India lies in island settings, where a combination of power, drinking water and cooling can justify the expense.
What is the future of ocean energy in India?
The future of ocean energy in India is likely to be gradual and focused on pilots, islands and research, supported by policy that recognises ocean energy as a renewable source. The Ministry of New and Renewable Energy has acknowledged tidal, wave and other marine technologies in its policy frameworks, including their eligibility for renewable purchase obligations, which gives developers a possible market.
Realistic steps include small tidal stream demonstrations in places with fast channels, wave devices to power coastal buoys, navigation aids and island microgrids, and further study of the Gulf of Khambhat that weighs power against ecology. Partnerships with countries that have operating projects could bring technology and finance, while improved materials and designs could lower costs.
India’s long coastline, its large tidal ranges and its growing need for clean power are real assets. But for now, the nation’s renewable growth will come mostly from sun and wind, with the sea as a promising but still distant addition.
Small-scale uses may prove the first commercial footholds. Island communities in the Sundarbans, the Andaman and Nicobar Islands and Lakshadweep often depend on expensive diesel generators, and even a modest tidal stream turbine or wave device could displace some of that fuel. In such places the comparison is not with cheap grid solar but with costly diesel brought in by ship, which changes the economics considerably. Combining marine power with solar panels, batteries and desalination could also give isolated communities a more resilient mix of electricity and drinking water, while giving Indian engineers real operating experience in ocean conditions.
Bottom Line
Tidal energy offers predictable, clean electricity, and India’s Gulf of Khambhat, Gulf of Kutch and Sundarbans are naturally suited to it. Yet no commercial plant exists, because high costs, silty waters and ecological concerns have defeated earlier proposals. Wave and ocean thermal energy are similarly stuck at pilot scale, so the sea remains a long-term prospect rather than a near-term pillar.
Frequently Asked Questions
Does India have a working tidal power plant?
No. India has no commercial tidal power plant in operation. Projects proposed in Gujarat and West Bengal were shelved or did not proceed as planned, mainly because of high costs.
Which Indian coast has the highest tidal energy potential?
The Gulf of Khambhat in Gujarat is generally seen as having the greatest potential, because its narrowing bay produces one of the country’s biggest tidal ranges. The Gulf of Kutch and the Sundarbans follow.
What is the difference between a tidal barrage and a tidal stream turbine?
A tidal barrage is a dam across a bay or estuary that holds back water and releases it through turbines. A tidal stream turbine sits underwater in fast currents, like a windmill, and needs no dam.
Is tidal energy harmful to marine life?
It can be, especially barrages, which change water flow and sediment and can affect mudflats, mangroves and fisheries. Tidal stream turbines are usually less disruptive but still need monitoring for effects on fish and marine mammals.
Has India tried wave energy?
Yes. The National Institute of Ocean Technology built a pilot wave energy plant at Vizhinjam in Kerala in the early 1990s, using an oscillating water column. It showed that the idea works but did not lead to commercial plants.
What is OTEC?
OTEC stands for ocean thermal energy conversion. It uses the temperature gap between warm surface seawater and cold deep water to generate power and, in India, has been explored mainly for island desalination.
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