This article is available also in spanish here

Recovering energy from traffic: positive energy roads

My list

Author | Tania AlonsoThere are over 1.2 billion registered vehicles worldwide. In the US alone, the road network exceeds six million kilometres in total length. And it is also estimated that, on average, roads worldwide are occupied by vehicles 10% of the time.Positive energy roads try to convert the magnitude of these figures into energy sources. Using the energy created by vehicles and from renewable sources and using it to power street lamps, traffic lights or nearby buildings.

Capturing and converting energy from vehicles

One of the first initiatives to generate energy via roads was implemented during the last decade. In 2009, the company Highway Energy Systems Ltd. installed electro-kinetic energy ramps in the carpark of a supermarket in Gloucester, United Kingdom. These ramps use the kinetic energy produced by vehicles when they drive over them.This is transmitted to a motor which, in turn, produces sufficient energy to feed nearly electrical devices. In this case, it was used to power all of the store’s cash registers.Other initiatives, such as Repsol’s project “Roads as energetics corps” are based on developing piezoelectric roads. Thanks to devices integrated into the asphalt, they can transform the pressure and vibration generated by vehicles into electrical energy at the rate of 1 kWh per 12 metres of road. However, given the cost, the system would only be feasible on very busy roads.

Solar roads

Tourouvre-au-Perche, a small town in Normandy (France) has, what is claimed to be, the first solar panel road in the world. The road consists of 2,800 square metres of solar panels covered with fine sheets of silicon to enable it to withstand the weight of the vehicles. The technology used for this initiative is Wattaway, developed by the French company Colas.According to the company, 20 square metres of these solar panels can provide sufficient energy to supply a household. And one kilometre can provide enough energy to power street lighting in a town of 5,000 inhabitants. Colas has subsequently paved more solar roads in Narbonne (France) and on the border between Alabama and Georgia (USA).Another solution involves capturing solar radiation and converting it into thermal energy. This is the idea of the Power Road initiative, invented by Eurovia. By integrating a heat exchanger into the road, the road captures this energy, stores it and sends it to nearby buildings and infrastructures via a heat pump system.According to Eurovia, 25 square metres of this technology can absorb the thermal energy used in a 70-square metre house in one year. And it can melt up to 20 cm of snow per day on roads and airport runways. In summer, this technology can also help to cool the upper layers of the asphalt.

Also spaces for two wheels

Not everything revolves around motorised vehicles. Holland has a bike path equipped with photovoltaic cells embedded into the concrete. The sunlight that beams down onto the road is absorbed by the solar cells and converted into electricity. This can be used to illuminate the road, traffic lights and traffic signs.This bike lane initiative (inaugurated in 2014 and measuring 70 metres in length) is called the SolaRoads project. It generated 3,000 kWh during its first six months. Enough electricity to power a house for a year.The list does not end here. Other projects are studying how to use, for example, the winds generated by vehicles driving over roads to generate electricity. Solutions that seek to redesign the concept of energy generation to combat the world’s growing energy demands. And, in turn, foster the use of environmentally-friendly formulas.Images | Unsplash/Ed 259, Unsplash/Alexander Popov, Wattaway/Defense92, SolaRoad

Recommended profiles for you
Remember to activate your profile to network!
Activate profile
DB
Dan Boyle
Cork City Council
City counciilor. Chair of Environment Policy Committee
Alexandre Nascimento
Alexandre Nascimento
Universidade do Estado de Minas Gerais (UEMG)
Professor - Rresearcher
KP
Kushagra Pithadiya
RYFIND Technologies Private Limited
CEO and Co-Founder
AP
Alok Patel
Organization
Manager
PR
Phil Reid
Tractebel Engineering SA
Global Business Development - Urban sector
CV
Carlos Velasquez
Toolmatech
General Manager
SS
Siang Chin Sim
Catalonia Trade and Investment
Consultant
as
alireza sarsangi
gis student
Phd student in GIS
JL
Jean-Sebastien Lalumiere
Mandapam Group
Founder
AZ
Abdel Rahman Zoubi
Asian Disaster Preparedness Center
Urban Residence Officer
AP
Adelino Jorge Pereira
ISEC
Professor
Marianella Pereira
Marianella Pereira
Chamber of Commerce of Terrassa
Responsible of management system
MR
Md Moontasir Rashid
University of the basque country
Student
FH
Feras Husami
Greater Amman Municipality
Training Center Manager
WA
Wesley Alves Machado
Em projeto
President
JP
JORGE PALACIOS
UNAC
Student of the university
SP
Sherry Ann Perez
N/A
KK
Komal Kishore
Farm Factory
Agripreneur traying to reduce the carbon footprint in traditional & innovative ways & make it simple
Ricardo Silva
Ricardo Silva
Escola Profissional de Tondela
Teacher specialised in energy and Informatics
Sesil  Koutra
Sesil Koutra
University of Mons
Teaching and research assistance

Only accessible for registered users
This content is available only for registered users
TO: $$toName$$
SUBJECT: Message from $$fromName$$