1.   And Tom Casten, president of Trigen Energy Corp., said that the deregulation of the utility industry would help double the efficiency of electricity plants.

2.   But they have not doubled their efficiency, as the productivity numbers seemed to suggest until late last year.

3.   Other features include a system that doubles the efficiency of the air conditioners, which run on non-ozone depleting materials.

4.   The automaker says the technology doubles fuel efficiency and cuts carbon dioxide emissions in half.

5.   The trash cleanup is almost complete, and with the Plexiglas installed, half of the workers turn their attention to picking up the planks, doubling their efficiency.

6.   Instead, Cuba will upgrade its oil-fuelled power plants, seeking to double their efficiency, he said.