HOUSTON, March 8 (Reuters) -

Italian utility Edison and Shell PLC ( SHEL ) on

Friday asked U.S. energy regulators to reject Venture Global

LNG's request for a one-year construction permit extension to

its Louisiana export plant.

Edison also asked the Federal Energy Regulatory Commission

to compel Venture Global to release commissioning documents to

justify the extension request.

"Shell LNG respectfully requests that the Commission

find

the Extension Request, in its conditional form, to be moot

and summarily deny it," the company said.

Venture Global last month asked for a one-year extension

to a Federal Energy Regulatory Commission (FERC) permit to

complete its Calcasieu Pass plant, or to receive assurances it

did not need an extension.