"It would be lovely to bring it back to a single-family residence," he said, "but it's not economically practical."

These applications are economically practical where photovoltaic power sources are weak or inconsistent.

The petroleum industry is calling for a 90 percent cut, or 50 parts per million, as more economically practical.

It was the first economically practical gas mantle, since prior mantles had involved expensive materials like platinum and iridium.

Various proposals for disposal of those hulls were considered, including sinking them at sea, but none were economically practical.

Researchers are trying to raise temperatures even further to make them economically practical.

Accuracy approaching one nanosecond worldwide is economically practical for many applications.

Reese says, aeroponics offers the ability to make bio-pharming economically practical.

It is not economically practical, environmentally reasonable, or technically feasible to provide dedicated access for every service to every customer.

Mr. Donahue said the industry would support recycling if it were economically practical.