Breakwater-mounted wave power with solar for fishing harbours and island jetties
TL;DR Wavejetty fixes wave-energy floaters to existing breakwaters and jetties, with the machinery on land, and pairs them with solar panels and a battery. It sells power to fishing harbours and island administrations that now burn diesel. Fair warning - expect years of pilots before this is a business.
India's islands still run largely on shipped fuel. Lakshadweep's electricity department says diesel generators were long the islands' only power source, with fuel carried from Calicut in barrels on cargo barges. By 2012 it ran 41 diesel sets and 12 small solar plants, and demand was rising about 5% a year[1].
Can't solar fix it? Not on its own. It stops at sunset and drops under monsoon cloud, while the sea keeps moving through the night. Wave energy could fill those gaps, and India's coast is estimated to hold around 40 GW of usable wave power[2]. In practice though, no wave device has run commercially in India yet.
What it does, in regulatory terms: small-scale renewable generation in coastal waters, which needs CRZ clearance and port or harbour permission.
Wavejetty mounts a row of floaters along the seaward face of a breakwater. As they rise and fall they drive hydraulic pistons, while the generator, accumulators and electronics sit on land, where a harbour electrician can reach them. Solar panels on the harbour sheds and a battery complete a hybrid system that serves ice plants, cold rooms and lighting, with diesel kept for backup.
The seed pitched submerged wave devices, and I'd reframe it. Offshore units need moorings, boats and divers for every repair, and India's best-known trial, IIT Madras's Sindhuja-I, produced about 100 W peak from its first prototype in 2022[2]. Wave power is still far from commercial worldwide[3]. Mounting on existing breakwaters cuts the marine work, and pairing with solar means wave power has to cover only the hours the sun cannot.
The users are fishers, harbour traders and island households. The payers would be island electricity departments, state fisheries departments that run harbours, and port authorities, through grants for the first units and then long power contracts. Oil companies are a second route: a state-run oil company signed an MoU in 2025 to host a 100 kW wave pilot at its Mumbai terminal[4]. I found no published cost of diesel power on the islands, so the price you must beat is unknown.
Corporate interest arrived in 2025, when a listed wave-energy company and that oil company agreed a feasibility study and a 100 kW pilot[4]. IIT Madras completed its sea trial in 2022 and partnered with a Visakhapatnam startup to commercialise its design[2]. The wave company's floaters start generating from 0.5 m waves and lift clear in storms[5], which suits a breakwater.
There is no public figure for an Indian wave-power market, and only theoretical potential estimates such as 40 GW[2]. Worldwide, all marine energy added up to 0.51 GW in 2025, against nearly 2,400 GW of solar[6]. That tells you how very early this is. The narrower demand signal is the diesel bill of island and harbour loads, which nobody publishes.
One listed wave-energy firm runs Israel's first grid-connected wave station on a breakwater and has a pilot at the Port of Los Angeles, with India in its pipeline through the oil company deal[4][5]. IIT Madras and a Visakhapatnam startup are developing an offshore buoy for remote marine loads[2]. Neither targets small fishing harbours or island jetties with a hybrid package. That's the gap, and it exists partly because the economics are unproven.
| Difficulty | Very hard (80/100) |
| Starting capital | ₹6–11.4 Cr |
| Time to launch | 30–48 months |
Everything at sea costs more and breaks sooner. You need a year of wave measurements at each breakwater before you can size anything, equipment that survives cyclones and salt, and clearances from several agencies. Then there's the buyer. No tariff category exists for wave power, so early contracts depend on grants and goodwill.
Yes, heavily. Anything fixed to a breakwater needs coastal and harbour clearances before you build, and selling the power needs its own agreement.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust AI-generated energy yield claims in grant or contract papers. Use measured wave data that the harbour's engineers can check.
Want to work out the AI layer for Wavejetty? Talk to Yash →
I'd only back a founder with marine-engineering depth and access to patient grant or corporate capital, ideally licensing an existing converter rather than inventing one. Everyone else should leave it alone, honestly. Before you raise money, measure one year of waves at two candidate breakwaters and show that wave plus solar cuts diesel use by a third in a model the harbour's own engineers accept.
Plan for roughly ₹6–11.4 Cr and several years of pilots, usually funded by grants or a corporate partner.
Yes. You need CRZ clearance, consent from the harbour and port authorities, and a power purchase agreement if you sell to an electricity department.
Yes, and some places are ahead of India here. Coastal permits and power-sale rules differ everywhere, so check with your local regulator first.
The free Wavejetty validation kit has the line-by-line capital breakdown, the effort scoring, the coastal-zone and harbour permission checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for harbour and island officials, and 5 assumptions to test. Download the kit →
Thinking about building Wavejetty or something close to it? The make-or-break bit is proving there is enough wave energy at a real breakwater and finding a buyer who will sign beyond a pilot, and that's the kind of thing I help founders with. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.