Fri, Feb 20, 2009 page6

• FEATURE : Paris digs deeper to harness Earth’s green energy

  AMBITIONS Around 170,000 French homes are heated geothermally and the government plans to multiply that by six, equaling 4 percent of the nation’s households

  • AFP
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  A major new project is under way in Paris to provide ecologically clean heating for an entire district by extracting piping hot water from nearly 2km under the earth.

  In a revival of the French capital’s geothermal potential, drilling has just begun in the north of the city on a desolate building site sandwiched between the traffic-clogged inner ring road and the Saint-Denis canal.

  “In Paris we’re trying to adopt a strategy in which France is largely behind other European countries, because we’ve underinvested in renewable energies,” Paris Deputy Mayor Denis Baupin said.

  

  Workers use machinery with a 36m mast to drill for hot water in Paris’ 19th district on Feb. 12. The hot water will heat around 12,000 apartments and other buildings due to be built by 2011.

  PHOTO: AFP

  At the construction site, a 36m yellow mast rises above a dense cluster of machinery that is usually used to drill for oil. Here the drilling is not for black gold but for hot water.

  “The lower you go, the hotter the water,” said Michel Galas of CPCU, the urban heating company doing the work, as he stood next to a shaft that, when finished, will delve 1.7km into the earth.

  At that depth lies a geological stratum called the Dogger from which water, heated naturally to 57°C, will be sucked up to the surface, where it will be used to heat another stock of water.

  This will be pumped to apartment blocks to heat radiators and provide hot water.

  “It’s energy that is 100 percent renewable,” Galas said.

  The scheme will heat around 12,000 apartments and other buildings due to be built by 2011 in a new residential area in the city’s 19th district. The project will cost 31 million euros (US$40 million), 5 million euros of which will come from the state environment agency and the regional council.

  Galas, whose company is jointly owned by the City of Paris and the energy group GDF Suez, pointed to a row of high-rise tower blocks on the other side of the ring road and said they too would eventually be hooked up to the system.

  The use of this natural energy source will prevent 14,000 tonnes a year of carbon dioxide being pumped into the capital’s already polluted air.

  That is roughly the same amount of carbon dioxide that an average car would belch out if taken on a 470,000km trip, which is longer than the distance from the Earth to the moon.

  It will also provide 54 percent of the new area’s energy needs.

  Galas said there were around three dozen sites using geothermal energy in the greater Paris region, nearly all dating from the 1970s and 1980s.

  “For about 25 years there were no new projects because the price of a barrel of oil had gone down, but in recent years there has been a growing awareness of environmental issues, combined with a hike in the price of oil,” he said.

  With the environment placed high on French President Nicolas Sarkozy’s political agenda, and with Baupin and his Green Party as the Socialists’ coalition partners in Paris, the time appeared right to return to geothermal.

  Geothermal energy has been used since Roman times to heat buildings. It uses the energy recovered from the heat of the earth’s core and can be seen naturally in the form of volcanoes, geysers and hot springs. Heated water drawn to the surface can, if of sufficiently high temperature, also be used to drive turbines to create electricity.

  In Iceland, about a quarter of the country’s electricity comes from geothermal power plants, while geothermal schemes provide heating and hot water for almost nine-tenths of its buildings.

  France’s geology does not permit tapping into geothermal energy on the Icelandic scale, but there is much unused potential. Around 170,000 French homes are heated geothermally, but the government plans to multiply that number by six by 2020, which would mean 4 percent of the nation’s households.

  The Paris area, Alsace in the east, and Aquitaine in the southwest are the regions best suited for such projects.

  Baupin, who is in charge of sustainable development and is the driving force behind the city’s wildly successful Velib bike-sharing scheme, said a second project is being developed in the north of the city.

  At talks on climate change in December in Poland, UN Environment Program executive director Achim Steiner spoke of geothermal as clean and “indigenous” — code for free from geopolitical risk and immune to market fluctuations.

  “We’re not trying to make Paris self-sufficient in energy, that would be too ambitious,” said Baupin, who nevertheless talks enthusiastically of other green energy projects such as harnessing the flow of the River Seine. “But we should aim to make ourselves less vulnerable to future energy crises.”
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