Aug 30 (Reuters) - After sweeping ashore to Louisiana from the Gulf of Mexico Sunday, Hurricane Ida lost some of its punch as it grinded over southwestern Mississippi on Monday. But the system, downgraded to a tropical storm, could still trigger heavy flooding throughout the region, according to the National Hurricane Center said.

Ida has knocked out power across Louisiana and Mississippi, with at least one person dead and more deaths feared.

Following is a list of stocks and sectors that could be impacted by the hurricane:

ENERGY

Ida pummeled U.S. Gulf Coast energy suppliers, knocking out most of the region's offshore wells and nearly half its motor fuel production.

Oil prices edged higher as Ida weakened and OPEC+ looked set to go ahead with a planned oil output increase. U.S. gasoline was up almost 2%. Nearly all offshore Gulf oil production, or 1.74 million barrels per day, was suspended in advance of the storm.

Gulf of Mexico offshore wells account for 17% of U.S. crude oil production, 5% of dry natural gas production, while more than 45% of total U.S. refining capacity lies along the Gulf Coast.

Exxon Mobil Corp, ConocoPhillips, Occidental Petroleum Corp, W&T Offshore, Valero Energy Corp and Marathon Petroleum were marginally lower in early afternoon New York trading.

"There's really no major effects to the energy (space). You see the refiners down just a bit, but it seems like those refiners are used to getting slammed every so often and yet they come right back," said Gary Bradshaw, senior vice president at Hodges Capital Management in Dallas, which holds shares in a number of energy firms including Exxon.

POWER

Power was knocked out Sunday night to the entire New Orleans metropolitan area following the failure of all eight transmission lines to the city. Power across Louisiana and Mississippi was out by Monday.

Shares in Entergy Louisiana were up 0.7%, while Entergy Corp was down 3.2%.

Generac Holdings was up 2% and on course to rise for a ninth straight session.

RETAILERS

Department store operator Kohls Corp said five of its stores in Louisiana and one in Mississippi are temporarily closed. Its shares were down 1.1% in afternoon trading.

INDUSTRIALS

Shares of chemicals maker Dow Inc were down just 0.6% as it said it shut down its manufacturing operations in Louisiana.

INSURERS

All eyes will be on insurers and reinsurers in the coming weeks as they report potential claims for damages caused by the hurricane.

Among those to watch, CNA Financial Corp was down 1.1%, Travelers Companies Inc was down 1.2%, and American International Group Inc was down 1%, while Allstate Corp, Chubb and Progressive Corp were barely lower on Monday.

FREIGHT AND LOGISTICS

Shares of USA Truck were up 2%, Old Dominion was up 1.2% and JB Hunt Transport Services Inc was up 1.3%.

(Reporting by Sruthi Shankar in Bengaluru and Caroline Valetkevitch in New York; Editing by Arun Koyyur and Lisa Shumaker)