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Solar Roads to Power Lights, Cars and Houses
Dr. Peter Harrop
MAR 28, 2016 16:35 PM
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Solar Roads to Power Lights, Cars and Houses

by Dr Peter Harrop

Installing photovoltaics in roads? This seems a strange idea at first. It sounds expensive and unlikely to work unless the surface is cleaned, free of snow and ice and in direct sunlight – all too infrequent in most places. Indeed, roads are constantly dug up by utilities, repairmen and others. How do you do that with sheets of glass?

Nevertheless, a closer look reveals that most of the problems are easily overcome and even at poor efficiency, that local electricity has viable uses. US start-up Solar Roadways® has a modular system of specially engineered solar panels that can be driven upon but also carry cables. They contain LED lights to create lines and signage without paint and heating elements to prevent snow and ice accumulation. Microprocessors let the panels to communicate with each other, a central control station, and vehicles. The glass has a tractioned surface which is equivalent to asphalt. So far they can only support the weight of semi-trucks but eventually these panels will be available for highways, but first will come non-critical applications such as driveways and parking lots. Solar Roadways has completed two funding contracts with the U.S. Department of Transportation, and has been awarded a third contract in November 2015.

Source: Solar Roadways®

Solar roads won’t replace power stations: do that with a field full of solar panels not transmission and maintenance over long distances on roads. However, they could be excellent for dynamic (in-motion) charging of electric vehicles possibly coupled with roadside wind turbines or tethered multicopters providing airborne wind energy (AWE) in the new jargon.

The bike path that connects the Amsterdam suburbs of Krommenie and Wormerveer is popular: 2,000 cyclists ride its two lanes daily. Back in 2014, TNO made a 70 metre stretch into the world’s first public road with embedded solar panels. Costing around €3m ($3.6m) and funded mostly by the local authority, this road is made up of rows of crystalline silicon solar cells, encased within concrete and covered with a translucent layer of tempered glass. A non-adhesive finish and a tilt help the rain wash off dirt. The panels produced roughly 30% less energy than those fixed on to roofs but when the path is extended to 100 metres in 2016, it will produce enough kilowatts to power three households, they claim.

Sten de Wit of TNO predicted that up to 20% of the Netherlands’ 140,000km of road could potentially be adapted, helping to power anything from traffic lights to electric cars. Tests have seen the solar panels successfully carry the weight of vehicles such as tractors.

Not to be outdone, a subsidiary of the French construction giant Bouygues is joining in. Minister of ecology and energy, Ségolène Royal, announced the French government would pave 1,000km (621 miles) of road with photovoltaic panels in the next five years. The project aims to supply electricity to 5 million people – about 8% of France’s population.

The move to off-grid clean energy created by “energy harvesting” to produce electricity where it is needed is now a major trend. Energy harvesting is more controllable and increasingly at lower cost than grid power or diesel gensets, cleaner and often less subject to interruption. It is taking new forms as revealed in the IDTechEx Research report, “High Power Energy Harvesting 2016-2026”.

The huge move to energy harvesting (EH) both on land and on and in vehicles and buildings will be covered at the IDTechEx Show! in Berlin, April 27-28.

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