Palace Casino Resort in Biloxi received the Four Diamond Award rating by the American Automobile Association.
The designation marks the 10th year the resort has received the AAA Four Diamond Award for its attributes, guest service and amenities.
"This prestigious award recognizes our staff's commitment to providing superior guest service and maintaining clean, high quality hotel accommodations," said Keith Crosby, general manager.
The AAA Diamond Rating Process is the only hotel and restaurant rating system that covers the entire United States and Canada plus top destinations in Mexico and the Caribbean. Only 5.7 percent of the more than 28,500 hotels achieve its Four Diamond designation.
Palace Casino recently completed the first phase of an energy-efficiency upgrade, converting its 236 guest rooms to LED lighting.
More than 3,000 light fixtures have been converted since October, saving 157,000 kilowatt hours of electricity a year. Occupancy sensors will be installed in the hotel rooms this year for additional energy savings.
"We've already seen a legitimate impact to our bottom line because of this lighting conversion," Crosby said. "We're reducing our cost of business, which in turn allows us to direct those resources to attracting more visitors to the Mississippi Gulf Coast."
The Palace used Mississippi Power's Energy Efficiency Program, which provides incentives for residential, commercial and industrial customers to promote energy savings.