Two office blocks by the Oslo fjord will generate more power than they use from 2014 after a radical refit meant to show that the world's energy-squandering building sector can do more to fight climate change.
Geothermal and solar energy generated on site will make the 1980s buildings "energy positive" in a tiny step to cut demand from the building sector that burns about 40 percent of world energy and emits a third of man-made greenhouse gas emissions.
So far, most focus in green energy has been on new buildings, not refits. Yet about 80 percent of existing buildings in developed nations will still be standing in 2050, by when governments are planning deep cuts in emissions.
"There is a huge global potential" in renovations, said Svein Richard Brandtzaeg, chief executive of Norwegian aluminum group Norsk Hydro which is a partner in the Powerhouse alliance behind the 110 million crown ($20 million) project near Oslo.
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