French company Céléwatt energized its 250 kW ground-mounted array, built with mounting structures made of raw oak wood.

The solar panels are installed on a raw wood structure, sourced from the surrounding forests, to promote local employment and a regional natural resource.

French cooperative Céléwatt has completed construction on a 250 kW solar park in Carayac, a commune in the Lot department in southwestern France.

The ground-mounted array was built with mounting structures made of raw oak wood, that was not processed in a sawmill. To optimize the mechanical characteristics of the rough wood and to avoid any discontinuity in the fibers, 600 oaks were cut, out of the growing season.

A first in France and in the world, this mounting structure concept was developed by French engineering company Mécojit. “After the final checks carried out by Mécojit, an Enedis technician made the connection at the end of the morning,” CéléWatt said in a press release. Enedis is France's grid operator.

Less than 18 months elapsed between the filing of the project approval request and the first kilowatt-hour being produced which, according to Céléwatt, proves the feasibility of community and regional renewable energy. The project was also supported by French energy cooperative Enercoop, which will buy power from the plant at a price of €0.08/kWh.

“Our original idea was to promote local employment and natural resources,” Bertrand Delpeuch, the president of Céléwatt, told pv magazine in November. “As we had no room for maneuver on the origin of our 746 monocrystalline panels, which are delivered to us from China by the company Talesun, we decided to focus on the poles.”

The stability of the panels will be checked every three years with a visual inspection of the resistance of the wood and a general overhaul will be carried out during the ten-year maintenance work. Céléwatt stated that everything was done to maximize the array's duration over time. “This is a very resistant and endogenous wood species, which will not fear weather fluctuations,” it added.

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More articles from Gwénaëlle Deboutte

Price on invirters and pv price pleas

Yes it’s nice to use the local sources but as it is a long term structure so we need to look on four dimentions to check the reliability as this setup will be visible to nature so please find the followings, 1.its good point to use the woods as it’s heavy against heavy winds that’s plus point it can’t be blow with air easily. 2. As it will be visible to sun and the materials are wood so as per the passage of time the woods may be dry and change the angels and structure. 3. As it is wood so the end of the woods may atleast to varnish or painted for water proofing that water not enter inside and absorb in the wood to decrease the lifespan of woods. 4.As the woods ends are touching the rough ground so insect may damage the woods.

Rest everything is OK Thanks & best Regards Irshad Ali 00971502815371

Dear Sir , Hope for quick response. Is the wood that is used inflammable? Pls reply fast As soon As possible.

Oak, especially white oak, is intrinsically water resistant (very tight grain) and also difficult to burn unless a fire is very hot (and even then, very slow burning and long burning). Lasts for several hundred years, not decades, when used for bridges (damp ground contact). If anything, this is over – built, not under – built.

Strasbourg Cathedral is built on untreated oak piles sunk into warerlogged gravel. These have held up for 800 years.

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