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Tidal Energy harnesses ocean currents with tidal turbines to deliver predictable, renewable power. From Scotland's Orkney to New York's East River, clean baseload electricity complements wind and solar in decarbonizing grids.

Key Points

Tidal energy uses underwater turbines to capture predictable ocean currents, delivering reliable, low-carbon power.

✅ Predictable 2-way flows enable forecastable baseload

✅ Higher energy density than wind, slower flow speeds

✅ Costs remain high; scaling and deployment are challenging

As the world looks to curb climate change and reduce fossil fuel emissions, some companies are focusing on a relatively untapped but vast and abundant source of energy — tidal waves.

On opposite sides of the Atlantic, two firms are working to harness ocean currents in different ways to try to generate reliable clean energy.

Off the coast of Scotland, Orbital Marine Power operates what it says is the "most powerful tidal turbine in the world." The turbine is approximately the size of a passenger airplane and even looks similar, with its central platform floating on the water and two wings extending downwards on either side. At the ends of each wing, about 60 feet below the surface, are large rotors whose movement is dictated by the waves.

"The energy itself of tidal streams is familiar to people, it's kinetic energy, so it's not too dissimilar to something like wind," Andrew Scott, Orbital's CEO, told CNN Business. "The bits of technology that generate power look not too different to a wind turbine."

But there are some key differences to wind energy, primarily that waves are far more predictable than winds. The ebb and flow of tides rarely differs significantly and can be timed far more precisely.

Orbital Marine Power's floating turbines off the Scottish coast produce enough energy to power 2,000 homes a year, while another Scottish tidal project recently produced enough for nearly 4,000 homes.

Orbital Marine Power's floating turbines off the Scottish coast produce enough energy to power 2,000 homes a year.

"You can predict those motions years and decades [in] advance," Scott said. "But also from a direction perspective, they only really come from two directions and they're almost 180 degrees," he added, unlike wind turbines that must account for wind from several different directions at once.

Tidal waves are also capable of generating more energy than wind, Scott says.

"Seawater is 800 times the density of wind," he said. "So the flow speeds are far slower, but they generate far more energy."

The Orbital turbine, which is connected to the electricity grid in Scotland's Orkney, can produce up to two megawatts — enough to power 2,000 homes a year — according to the company.

Scott acknowledges that the technology isn't fully mainstream yet and some challenges remain including the high cost of the technology, but the reliability and potential of tidal energy could make it a useful tool in the fight against climate change, as projects like Sustainable Marine in Nova Scotia begin delivering power to the grid.

"It is becoming increasingly apparent that ... climate change is not going to be solved with one silver bullet," he said.

'Could be 24/7 power'
Around 3,000 miles away from Orbital's turbines, Verdant Power is using similar technology to generate power near Roosevelt Island in New York City's East River. Although not on the market yet, Verdant's turbines set up as part of a pilot project help supply electricity to New York's grid. But rather than float near the surface, they're mounted on a frame that's lowered to the bottom of the river.

"The best way to envision what Verdant Power's technology is, is to think of wind turbines underwater," the company's founder, Trey Taylor, told CNN Business. And river currents tend to provide the same advantages for energy generation as ocean currents, he explained (though the East River is also connected to the Atlantic).

"What's nice about our rivers and systems is that could be 24/7 power," he said, even as U.S. offshore wind aims to compete with gas. "Not to ding wind or solar, but the wind doesn't always blow and the sun doesn't always shine. But river currents, depending on the river, could be 24/7."

Verdant Power helps supply electricity to New York City
Over the course of eight months, Verdant has generated enough electricity to power roughly 60 homes — though Taylor says a full-fledged power plant built on its technology could generate enough for 6,000 homes. And by his estimate, the global capacity for tidal energy is enormous, with regions like the Bay of Fundy pursuing new attempts around Nova Scotia.

A costly technology
The biggest obstacle to reaching that goal at the moment is how expensive it is to set up and scale up tidal power systems.

"Generating electricity from ocean waves is not the challenge, the challenge is doing it in a cost-effective way that people are willing to pay for that competes with ... other sources of energy," said Jesse Roberts, Environmental Analysis Lead at the US government-affiliated Sandia National Laboratories. "The added cost of going out into the ocean and deploying in the ocean... that's very expensive to do," he added. According to 2019 figures from the US Department of Energy, the average commercial tidal energy project costs as much as $280 per megawatt hour. Wind energy, by comparison, currently costs roughly $20 per megawatt hour and is "one of the lowest-priced energy sources available today," with major additions like the UK's biggest offshore wind farm starting to supply the grid, according to the agency.

When operational, the Orbital turbine's wing blades drop below the surface of the water and generate power from ocean currents.

When operational, the Orbital turbine's wing blades drop below the surface of the water and generate power from ocean currents.

Roberts estimates that tidal energy is two or three decades behind wind energy in terms of adoption and scale.

The costs and challenges of operating underwater are something both Scott and Taylor acknowledge.
"Solar and wind are above ground. It's easy to work with stuff that you can see," Taylor said. "We're underwater, and it's probably easier to get a rocket to the moon than to get these to work underwater."
But the goal of tidal power is not so much to compete with those two energy sources as it is to grow the overall pie, alongside innovations such as gravity power that can help decarbonize grids.

"The low hanging fruit of solar and wind were quite obvious," Scott said. "But do they have to be the only solution? Is there room for other solutions? I think when the energy source is there, and you can develop technologies that can harness it, then absolutely."
 

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2020 U.S. Renewable Electricity Generation set a record as wind, solar, hydro, biomass, and geothermal produced 834 billion kWh, surpassing coal and nuclear, second only to natural gas in nationwide power output.

Key Points

The record year when renewables made 834 billion kWh, topping coal and nuclear in U.S. electricity.

✅ Renewables supplied 21% of U.S. electricity in 2020

✅ Coal output fell 20% y/y; nuclear slipped 2% on retirements

✅ EIA forecasts renewables rise in 2021-2022; coal rebounds

In 2020, renewable energy sources (including wind, hydroelectric, solar, biomass, and geothermal energy) generated a record 834 billion kilowatthours (kWh) of electricity, or about 21% of all the electricity generated in the United States. Only natural gas (1,617 billion kWh) produced more electricity than renewables in the United States in 2020. Renewables surpassed both nuclear (790 billion kWh) and coal (774 billion kWh) for the first time on record. This outcome in 2020 was due mostly to significantly less coal use in U.S. electricity generation and steadily increased use of wind and solar generation over time, amid declining consumption trends nationwide.

In 2020, U.S. electricity generation from coal in all sectors declined 20% from 2019, while renewables, including small-scale solar, increased 9%. Wind, currently the most prevalent source of renewable electricity in the United States, grew 14% in 2020 from 2019, and the EIA expects solar and wind to be larger sources in summer 2022, reflecting continued growth. Utility-scale solar generation (from projects greater than 1 megawatt) increased 26%, and small-scale solar, such as grid-connected rooftop solar panels, increased 19%, while early 2021 January power generation jumped year over year.

Coal-fired electricity generation in the United States peaked at 2,016 billion kWh in 2007 and much of that capacity has been replaced by or converted to natural gas-fired generation since then. Coal was the largest source of electricity in the United States until 2016, and 2020 was the first year that more electricity was generated by renewables and by nuclear power than by coal (according to our data series that dates back to 1949). Nuclear electric power declined 2% from 2019 to 2020 because several nuclear power plants retired and other nuclear plants experienced slightly more maintenance-related outages.

We expect coal-fired generation to increase in the United States during 2021 as natural gas prices continue to rise and as coal becomes more economically competitive. Based on forecasts in our Short-Term Energy Outlook (STEO), we expect coal-fired electricity generation in all sectors in 2021 to increase 18% from 2020 levels before falling 2% in 2022. We expect U.S. renewable generation across all sectors to increase 7% in 2021 and 10% in 2022, and in 2021, non-fossil fuel sources accounted for about 40% of U.S. electricity. As a result, we forecast coal will be the second-most prevalent electricity source in 2021, and renewables will be the second-most prevalent source in 2022. We expect nuclear electric power to decline 2% in 2021 and 3% in 2022 as operators retire several generators.

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AP Renewables Inc. Climate Bond Award recognizes Asia-Pacific project finance, with ADB and CNBC citing the first Climate Bond, geothermal refinancing in local currency, and CGIF-backed credit enhancement for emerging markets.

Key Points

An award for APRI's certified Climate Bond, highlighting ADB-backed financing and geothermal assets across Asia-Pacific.

✅ First Climate Bond for a single project in an emerging market

✅ ADB credit enhancement and CGIF risk participation

✅ Refinanced Tiwi and MakBan geothermal assets via local currency

The Asian Development Bank (ADB) and CNBC report having given the Best Project For Corporate Finance Transaction award to a the renewable energy arm of Aboitiz Power, AP Renewables Inc. (APRI), for its innovative and impactful solutions to key development challenges.

In March 2016, APRI issued a local currency bond equivalent to $225 million to refinance sponsor equity in Tiwi and MakBan. ADB said it provided a partial credit enhancement for the bond as well as a direct loan of $37.7 million, a model also seen in EIB long-term financing for Indian solar projects.

The bond issuance was the first Climate Bond—certified by the Climate Bond Initiative—in Asia and the Pacific and the first ever Climate Bond for a single project in an emerging market.

“The project reflects APRI’s commitment to renewable energy, as outlined in the IRENA report on decarbonising energy in the region,” ADB said in a statement posted on its website.

The project also received the 2016 Bond Deal of the Year by the Project Finance International magazine of Thomson Reuters, Asia Pacific Bond Deal of the Year from IJGlobal and the Best Renewable Deal of the Year by Alpha Southeast Asia, reflecting momentum alongside large-scale energy projects in New York reported elsewhere.

ADB’s credit enhancement was risk-participated by the Credit Guarantee Investment Facility (CGIF), a multilateral facility established by Asean + 3 governments and ADB to develop bond markets in the region.

APRI is a subsidiary of AboitizPower, one of Philippines’ biggest geothermal energy producers, and the IRENA study on the Philippines' electricity crisis provides broader context as it owns and operates the Tiwi and Makiling Banahaw (MakBan) geothermal facilities, the seventh and fourth largest geothermal power stations in the world, respectively.

“The awards exemplify the ever-growing importance of the private sector in implementing development work in the region,” ADB’s Private Sector Operations Department Director General Michael Barrow said.

“Our partners in the private sector provide unique solutions to development challenges — from financing to technical expertise — and today’s winners are perfect examples of that,” he added.

The awarding ceremony took place in Yokohama, Japan during an event co-hosted by CNBC and ADB at the 50th Annual Meeting of ADB’s Board of Governors.

The awards focus on highly developmental transactions and underline the important work ADB clients undertake in developing countries in Asia and the Pacific.

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Nova Scotia Biomass Electricity Policy increases dispatchable renewable generation from Port Hawkesbury and Brooklyn Energy, raising MWh output while critics cite clearcutting, carbon emissions, high costs to ratepayers, and delays replacing Muskrat Falls hydro.

Key Points

Policy directing utilities to maximize biomass power as dispatchable renewable supply during hydro delays.

✅ Port Hawkesbury biomass output up 35% year over year

✅ Brooklyn Energy used as dispatchable renewable supply

✅ Critics cite clearcutting, emissions, high ratepayer costs

A boiler owned by Nova Scotia Power on the grounds of the Port Hawkesbury paper plant, whose discount power rate request has drawn attention, is burning 35% more woody biomass this year than last. 

The year-to-date figures show 126,810 megawatt hours (MWh) of electricity was generated over the first nine months of 2021 compared to 93,934 MWh for the same period in 2020 and 65,891 MWh in 2019. 

The information is contained in monthly fuel cost reports Nova Scotia Power must make to the Utility and Review Board, which regulates how much consumers ultimately pay for electricity and has received a call for major grid changes in Nova Scotia.

Burning biomass  — which includes everything from low-grade pulpwood to bark, shavings, and wood chip waste from sawmills — for the purpose of generating electricity is only about 22% efficient, even as some coal stations have switched to biomass abroad. Nova Scotia Power’s boiler at Port Hawkesbury supplies about 3% of the total electricity used in the province. 

Citizens concerned about climate change have for years opposed the government classifying biomass as “renewable energy” and have echoed calls to reduce biomass use for electricity, because clearcutting, which releases carbon from the ground, remains the dominant form of harvesting on Crown and private land. That’s despite ongoing work to begin implementing 2018 recommendations from Professor Bill Lahey to move toward a more ecological approach. 

In May 2020, after it became obvious renewable hydroelectricity from Muskrat Falls was going to be delayed yet again, the McNeil government passed an Order-in-Council extending until December 2022 the deadline to generate 40% of electricity from renewable sources as it moved to increase wind and solar projects across Nova Scotia. 

To help with the shortfall, Nova Scotia Power was told to “maximize” its use of biomass at both the facility it owns in Port Hawkesbury and another one in Brooklyn owned by its parent company, Emera.

In a letter to Nova Scotia Power dated May 15, then-Energy Minister Derek Mombourquette, amid debate over independent energy planning, added: “Nova Scotia Power shall also maximize the use of dispatchable renewable electricity from its own facilities, as well as those of renewable electricity power producers in Nova Scotia (excluding COMFIT generation sources).” 

By definition, “dispatchable” excludes wind and hydro sources, which are not available 24/7, though a new attempt to harness the Bay of Fundy's tides is underway. Nova Scotia Power claims the only “dispatchable renewable electricity power producer” in the province is Brooklyn Energy, the 35 MW biomass plant near Liverpool. 

The government capped at $7 million a year how much electricity Nova Scotia Power could buy from its affiliate company. Critics of the deal — such as auditors hired by the regulator and the province’s consumer advocate — say electricity generated by Brooklyn is the most expensive power and question why the province would burden ratepayers with its purchase.

The answer became apparent in September 2020 when then-Intergovernmental Affairs Minister Kelliann Dean appeared before the legislature’s standing committee on Natural Resources and Economic Development to praise the Order-in-Council for helping rescue the forestry industry four months after the closure of the Northern Pulp mill. 

“The change to Renewable Energy Standards (May,2020) is enabling Nova Scotia Power to generate more electricity from wood chips and sawmill residuals by operating two biomass plants at capacity until electricity from Muskrat Falls comes onstream,” she said. “We are using all the policy levers at our disposal to support the sector.”

Nova Scotia Power is not required to report to the UARB how much electricity is being produced or how much biomass is being burned at Brooklyn Energy. The company pleads “commercial confidentiality” when asked by The Halifax Examiner. 

Nova Scotia Power does report how much it spends each month to buy power from independent producers — a small group which includes Brooklyn but excludes all wind farms. That dollar amount has also increased over the past year — from $15.9 million for 10 months ending October 2020 compared to $23.3 million for 10 months ending October 2021. Unfortunately, the lack of transparency makes it impossible to know exactly how much of that increase is attributable to purchasing more biomass.

Radio silence
The current Minister of Natural Resources and Renewable Energy ,Tory Rushton, has the authority to reduce the amount of biomass being burned to generate electricity and by extension, the rate of clearcutting.

With a stroke of the pen, the PC government of Tim Houston could issue another Order-in-Council capping the amount of metric tonnes that could be used in the boilers, or, direct Nova Scotia Power to use biomass only when it is the most economical fuel choice. 

But so far, Rushton has not responded to the Halifax Examiner’s question about whether he intends to make any change to stop “maximizing” the use of biomass to produce electricity.

 The Examiner isn’t the only one pushing the Minister for answers to difficult issues. At noon today, Citizens opposed to a controversial clearcut on Crown land near Rocky Point Lake in Digby County will stage a demonstration outside the Department of Natural Resources and Renewable Energy on Hollis Street. The protest led by members of Extinction Rebellion and the Healthy Forest Coalition is to pressure the government to take action to protect the habitat of the mainland moose, an endangered species that ranges overs the Crown land currently being cut by the Westfor consortium. 

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Electrified Trucking Grid Integration explores vehicle-to-grid (V2G) strategies where rolling batteries backfeed power during peak demand, optimizing charging infrastructure, time-of-use pricing, and IESO market operations for Ontario shippers like Nature Fresh Farms.

Key Points

An approach using V2G-enabled electric trucks to support the grid, cut peak costs, and add revenue streams.

✅ Models charging sites, timing, and local grid impacts.

✅ Evaluates V2G backfeed economics and IESO pricing.

✅ Uses Nature Fresh Farms data for logistics and energy.

A University of Windsor project will study whether an electrified trucking industry might not only deliver the goods, but help keep the lights on with the timely off-loading of excess electrons from their powerful batteries via vehicle-to-grid approaches now emerging.

The two-year study is being overseen by Environmental Energy Institute director Rupp Carriveau and associate professor Hanna Moah of the Cross-Border Institute in conjunction with the Leamington-based greenhouse grower Nature Fresh Farms.

“The study will look at what happens if we electrified the transport truck fleet in Ontario to different degrees, considering the power demand for truck fleets that would result,” Carriveau said.

“Where trucks would be charging and how that will affect the electricity grid grid coordination in those locations at specific times. We’ll be able to identify peak times on the demand side.

“On the other side, we have to recognize these are rolling batteries. They may be able to backfeed the grid, sell electricity back to prop the grid up in locations it wasn’t able to in the past.”

The national research organization Mathematics of International Technology and Complex Systems (Mitacs) is funding the $160,000 study, and the Independent Electricity Systems Operator, a Crown corporation responsible for operating Ontario’s electricity market, amid an electricity supply crunch that is boosting storage efforts, is also offering support for the project.

Because of the varying electricity prices in the province based on usage, peak demand and even time of year, Carriveau said there could be times where draining off excess truck battery power will be cheaper than the grid, and vehicle-to-building charging models show how those savings can be realized.

“It could offer the truck owner another revenue stream from his asset, and businesses a cheaper electricity alternative in certain circumstances,” he said.

The local greenhouse industry was a natural fit for the study, said Carriveau, based on the amount of work the university does with the sector along with the fact it is both a large consumer and producer of electricity.

The study will be based on assumptions for electric truck capacity and performance because the low number of such vehicles currently on the road, though large electric bus fleets offer operational insights.

How will an electrified trucking industry affect Ontario’s electricity grid? University of Windsor engineering professor Rupp Carriveau is part of a new study on trucks being used to help deliver electricity as well as their products around Ontario. He is shown on campus on Tuesday, July 6, 2021.

How will an electrified trucking industry affect Ontario’s electricity grid? University of Windsor engineering professor Rupp Carriveau is part of a new study on trucks being used to help deliver electricity as well as their products around Ontario. He is shown on campus on Tuesday, July 6, 2021.

Nature Fresh Farms will supply all its data on power use, logistics, utility costs and shipping schedules to determine if switching to an electrified fleet makes sense for the company.

“As an innovative company, we are always thinking, ‘What is next?’, whether its developments in product varieties, technology or sustainability,” said company CEO Peter Quiring. “Green transportation is the next big focus.

“We were given the opportunity to work closely on this project and offer our operations as a case study to see how we can find feasible alternatives, not only for Nature Fresh Farms or even for companies in agriculture, but for every industry that relies on the transportation of their goods.”

Currently, Nature Fresh Farms doesn’t have any electrified trucks. Carriveau said the second phase of the study might actually involve an electric truck in a pilot project.

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Wind Turbine Operations and Maintenance Market is expanding as offshore and onshore renewables scale, driven by aging turbines, investment, UAV inspections, and predictive O&M services, despite skills shortages and rising logistics costs.

Key Points

Sector delivering inspection, repair, and predictive services to keep wind assets reliable onshore and offshore.

✅ Aging turbines and investor funding drive service demand

✅ UAV inspections and predictive analytics cut downtime

✅ Offshore growth offsets skills and logistics constraints

Wind turbines are capable of producing vast amounts of electricity at competitive prices, provided they are efficiently maintained and operated. Being a cleaner, greener source of energy, wind energy is also more reliable than other sources of power generation, with growth despite COVID-19 recorded across markets. Therefore, the demand for wind energy is slated to soar over the next few years, fuelling the growth of the global market for wind turbine operations and maintenance. By application, offshore and onshore wind turbine operations and maintenance are the two major segments of the market.

Global Wind Turbine Operations and Maintenance Market: Key Trends

The rising number of aging wind turbines emerges as a considerable potential for the growth of the market. The increasing downpour of funds from financial institutions and public and private investors has also been playing a significant role in the expansion of the market, with interest also flowing toward wave and tidal energy technologies that inform O&M practices. On the other hand, insufficient number of skilled personnel, coupled with increasing costs of logistics, remains a key concern restricting the growth of the market. However, the growing demand for offshore wind turbines across the globe is likely to materialize into fresh opportunities.

Global Wind Turbine Operations and Maintenance Market: Market Potential

A number of market players have been offering diverse services with a view to make a mark in the global market for wind turbine operations and maintenance. For instance, Scotland-based SgurrEnergy announced the provision of unmanned aerial vehicles (UAVs), commonly known as drones, as a part of its inspection services. Detailed and accurate assessments of wind turbines can be obtained through these drones, which are fitted with cameras, with four times quicker inspections than traditional methods, claims the company. This new approach has not only reduced downtime, but also has prevented the risks faced by inspection personnel.

The increasing number of approvals and new projects is preparing the ground for a rising demand for wind turbine operations and maintenance. In March 2017, for example, the Scottish government approved the installation of eight 6-megawatt wind turbines off the coast of Aberdeen, towards the northeast. The state of Maryland in the U.S. will witness the installation of a new offshore wind plant, encouraging greater adoption of wind energy in the country. The U.K., a leader in UK offshore wind deployment, has also been keeping pace with the developments, with the installation of a 400-MW offshore wind farm, off the Sussex coast throughout 2017. The Rampion project will be developed by E.on, who has partnered with Canada-based Enbridge Inc. and the UK Green Investment Bank plc.

Global Wind Turbine Operations and Maintenance Market: Regional Outlook

Based on geography, the global market for wind turbine operations and maintenance has been segmented into Asia Pacific, Europe, North America, and Rest of the World (RoW). Countries such as India, China, Spain, France, Germany, Scotland, and Brazil are some of the prominent users of wind energy and are therefore likely to account for a considerable share in the market. In the U.S., favorable government policies are backing the growth of the market, though analyses note that a prolonged solar ITC extension could pressure wind competitiveness. For instance, in 2013, a legislation that permits energy companies to transfer the costs of offshore wind credits to ratepayers was approved. Asia Pacific is a market with vast potential, with India and China being major contributors aiding the expansion of the market.

Global Wind Turbine Operations and Maintenance Market: Competitive Analysis

Some of the major companies operating in the global market for wind turbine operations and maintenance are Gamesa Corporacion Tecnologica, Xinjiang Goldwind Science & Technologies, Vestas Wind Systems A/S, Upwind Solutions, Inc, GE Wind Turbine, Guodian United Power Technology Company Ltd., Nordex SE, Enercon GmbH, Siemens Wind Power GmbH, and Suzlon Group. A number of firms have been focusing on mergers and acquisitions to extend their presence across new regions.

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