The answer to North America’s energy challenge is blowing in the offshore wind

​Published on August 12th, 2016
The US, the world's second largest emitter of CO2, is faced with the task of converting its energy system from black to green. Offshore wind can help get the job done.


We believe that the US has the perfect conditions for exploiting the potential of offshore wind. Hoping to help realise this potential, we have acquired the rights to establish wind farms in two areas off the country's east coast. The costs of offshore wind is still seen as a challenge but we are working hard to drive down the costs. "It's a matter of drawing on experiences from other parts of the world and thinking big," says Thomas Brostrøm, head of our US operations.


Green conversion requires fresh thinking

The gradual conversion of US energy from fossil fuels to more sustainable energy sources has been ongoing since the energy crisis in the 1970's. The primary focus has been on energy from onshore wind turbines. Since 2000, the amount of energy generated by onshore wind has risen twenty-fold, yet, despite many years of preparations, the US is still awaiting its first offshore wind farm. We want to help change that fact.


So far, the US has been able to use the large, relatively sparsely populated areas of the Midwest to install onshore wind turbines. But implementing sustainable solutions to energy and environment problems around the cities and densely populated areas of the east coast and elsewhere in the country is a challenge – and that is where offshore wind comes into the picture.

"Offshore wind farms are an obvious local alternative to fossil power stations in metropolitan areas and the obvious way to ensure sustainable energy supplies for Americans in the future," says Thomas Brostrøm.


Ideal conditions

Some of the most suitable areas for offshore wind in the US are situated off the eastern seaboard. Here we have provisionally acquired the rights to build two offshore wind farms. The seabed there is similar to that of Europe, where offshore wind is the fastest growing energy technology. In DONG Energy, we have built more than a quarter of the world's offshore wind power, and we will be able to draw on this experience when developing the new wind farms in the United States.


The plan is that one of the offshore wind farms will be sited 90km off the coast of Massachusetts. From here, it will provide sustainable energy for citizens in and around Boston, while the other wind farm will be sited 24km off the coast of New Jersey. The first farm alone will be able to cover the power consumption of nearly half a million US homes. This is only possible because offshore wind is stronger and more reliable than onshore wind, consequently generating a greater output.


Green energy needs to be cheaper than black

Offshore wind is a young industry compared with coal and gas. That is also why clean energy from offshore wind still costs more than polluting energy from coal and gas. But the picture is changing. We anticipate that green energy from offshore wind will be cheaper than fossil energy within a decade.


"If the conversion of the US energy sector from fossil energy to clean, renewable energy is to succeed, green energy cannot cost more than black. This means that offshore wind must become cheaper than fossil alternatives, which requires the whole industry to think big and pull together to bring down prices," explains Thomas Brostrøm.


Thomas Brostrøm points to the strong technological developments within offshore wind in recent years, which have brought about a significant reduction in costs.


"For one thing, the blade span of the wind turbines has more than doubled in about 15 years. Wind farms are getting bigger and can be located further out at sea, where they are out of sight and can take advantage of the higher wind speeds. At the same time, we're continually getting better at standardising and optimising installation and maintenance of wind turbines. All this is helping to drive down costs, which ultimately means more green energy for our homes," Thomas Brostrøm concludes.


We have a market share of 26% of the world's installed offshore wind and expect to more than double our capacity by the end of 2020.