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Toward More Aesthetic Power Lines

July 22, 2017 • ARTICLE ARCHIVE, Transmission Structures, Utility Practice & Experience
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The issue of grid aesthetics is really a question of image. For example, the concept of ‘industrial soldiers marching across the landscape’ was used to support an entry in a 2008 competition for a new pylon to be used by Italian TSO Terna.

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This edited contribution by internationally renowned architect, Hugh Dutton of Hugh Dutton Associés (HDA) in Paris, argued that the core issue today goes beyond the aesthetics of any single pylon design. Rather it is now mainly a question of the image and identity of the entire power line.


 Symbolism

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It is useful to reflect on the fact that trellis (lattice) type pylons were once considered a symbol of progress and by that definition enjoyed a mostly positive image. A decades old electoral poster for then Presidential candidate, Francois Mitterand, for example, portrayed him alongside a trellis pylon. Today, by contrast, political candidates usually promise ecology and green fields. Times have changed and the image of power transmission must change as well. It must also adapt to new technologies as well as a society with a much different state of mind. Development of power lines must further respond to new communication possibilities when it comes to public forums and discussion.

 

 

Public Debate

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Some major power companies, such as Terna, RTE and National Grid, have taken the initiative to hold design competitions on aesthetic designs for their new transmission systems. Indeed taking the step of considering and debating aesthetic design for overhead lines is fast becoming a necessity. Acceptance of new power lines in the communities and places affected can be considerably improved if the public can share and participate in the debate and consideration of alternative proposals.

For example, the Equilibre design for the Avelin-Gavrelle Line in northern France was selected in the final stages by a committee of local representative groups. The process of acceptance of the line is followed through an active blog that RTE maintained on line, encouraging interaction with the community and providing periodic updates and information: http://www.rte-ligne-avelingavrelle.com. Indeed, this internet forum is an essential ingredient in the communication of design and a whole new image for electricity transmission.

Nature as Inspiration

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HDA normally designs structures, buildings, facades, bridges, etc. and came across designing power pylons when invited to participate in a competition by Terna in Italy. This allowed approaching the topic with a ‘fresh mind’. Creativity is essential to good design and work is often inspired by nature, which provides the ‘rules to play by’ and also offers solutions to inspire. For example, trees do a similar job to the one being asked of power pylons yet accomplish it with natural elegance and poise.

‘Tensegrity’

Much of the work at HDA has involved tensile structures based on early work in cable-stayed facades. In fact, a cable-suspended footbridge in Turin inspired the firm being invited to participate in the Terna competition. Using tension structure concepts to resolve design of high-tension (voltage) lines was therefore an immediate consideration. The idea was based on the belief that the silhouette of power line structures could be better controlled if certain of their components were considered in tension. These could disappear, or at least diminish in visual impact, when viewed from a distance, leaving a freer hand to design the silhouette. This approach led to the design of Germoglio for Terna.

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