Calm waters and big power

I noticed this last week but forgot to post about it:

Vast arrays of solar panels floating on calm seas near the Equator could provide effectively unlimited solar energy to densely populated countries in Southeast Asia and West Africa.

Our new research shows offshore solar in Indonesia alone could generate about 35,000 terawatt-hours (TWh) of solar energy a year, which is similar to current global electricity production (30,000TWh per year).

And while most of the world’s oceans experience storms, some regions at the Equator are relatively still and peaceful. So relatively inexpensive engineering structures could suffice to protect offshore floating solar panels.

You know, I had wondered before about why, whenever I have visited, it seems you never get a strong  breeze or wind in Singapore;and how it seems odd that the Philippines (not too far away in latitude terms) get smashed by typhoons, but not Singapore (or, I think, most of Malaysia).  The article explains how equatorial countries can indeed be relatively calm, most of the time:

...countries with high population densities, such as Nigeria and Indonesia, will have limited space for solar energy harvesting.

Their tropical location in the so-called “doldrum” latitudes also means wind resources are poor. Fortunately, these countries – and their neighbours – can harvest effectively unlimited energy from solar panels floating on calm equatorial seas.

Floating solar panels can also be placed on inland lakes and reservoirs. Inland floating solar has large potential and is already growing rapidly.

Our recently released paper surveys the global oceans to find regions that didn’t experience large waves or strong winds over the past 40 years. Floating solar panels in such regions do not require strong and expensive engineering defences.

Regions that don’t experience waves larger than 6 metres nor winds stronger than 15m per second could generate up to one million TWh per year. That’s about five times more annual energy than is needed for a fully decarbonised global economy supporting 10 billion affluent people.

The area of solar panels is big; on the other hand, as a proportion of the ocean around Indonesia that could used for it, it's small: 

 About 25,000 square km of solar panels would be required to support an affluent Indonesia after full decarbonisation of the economy using solar power.

Indonesia has the option of floating vast numbers of solar panels on its calm inland seas. The region has about 140,000 square km of seascape that has not experienced waves larger than 4m – nor winds stronger than 10m per second – in the past 40 years.

Indonesia’s maritime area of 6.4 million square km is 200 times larger than required if Indonesia’s entire future energy needs were met from offshore floating solar panels.

They include this map:

 

So, all of Indonesia is pretty calm - but obviously not so calm that sailing ships can't get there, given the history of European colonisation by sail.

Interesting.  I think floating solar is going to be big...