1924 - Midnight, December 31 - Mississippi Power Company founded
1929 - Company extends from Tennessee to the Coast with 40,000 customers
1934 - TVA takes over northern half of Mississippi Power Company's service area
1940 - Security and Exchange Commission orders dissolution of Commonwealth & Southern, a predecessor to Mississippi Power Company's parent corporation, Southern Company.
1945 - Plant Eaton begins commercial operation.
1947 - Southern Company established as the holding company for four utilities including Mississippi Power.
1947 - An unnamed hurricane smashes the seawall of the Mississippi Gulf Coast and destroys parts of Highway 90, which led to the creation of the Coast's sand beach.
1951 - Plant Sweatt begins commercial operation.
1953 - A second unit at Plant Sweatt increases electricity generation to 1 billion kilowatt-hours a year.
1956 - Mississippi Public Service Commission established.
1957 - Plant Watson begins commercial operation.
1965 - Unit Four built at Plant Watson.
1969 - Hurricane Camille does millions of dollars of damage to the company's electric facilities.
1970 - Mississippi Power receives its first Edison Award in recognition for service restoration following Hurricane Camille.
1973 - The oil embargo and energy crisis leads to higher electricity costs.
1977 - First unit of Plant Daniel in Jackson County begins commercial operation.
1979 - Hurricane Frederic knocks out power to 60 percent of the company's customers.
1981 - Unit Two at Plant Daniel begins commercial operation.
1983 - Company begins annual $25,000 donation to the Red Cross to aid the elderly disadvantaged with heating bills. The company later raised the annual donation to $50,000.
1985 - Hurricane Elena causes damage from the Coast to Meridian.
1986 - Performance Evaluation Plan enacted, the nation's first performance-based rate making plan for an electric utility.
1992 - Environmental Compliance Overview Plan enacted.
1995 - Nine new summer peak demands set from 1,881,000 kW to 2,095,000 kW.
1998 - Six new summer peak demand records set, culminating in 2,339,000 kW.
1998 - Hurricane Georges causes extensive damage to company facilities in Jackson County, especially at Chevron Cogenerating Plant.
1999 - Four new summer peak demand records set, the highest being 2,439,000 kW.
1999 - Construction begins on two combined-cycle gas-fired generating units at Plant Daniel that would increase the company's generating capacity by nearly 50 percent.
1999 - Mississippi Power joins other companies in preparing for the Y2K bug that threatens to shut down computers and other critical operations when the year turns from 1999 to 2000. Midnight doesn't cause a blip in electric operations - or anything else for that matter.
2002 - Duke Energy, a large-scale independent power producer, interconnected with Mississippi Power's transmission system with station service provided at its 640-megawatt plant in Enterprise.
2003 - Mississippi Power Education Foundation started its New Teacher Assistance Grants designed to attract and retain high quality teachers to service area schools. The program provides $750 grants to help first-year teachers set up classrooms.
2003 - The Mississippi Power Community Connection was created, combining the charitable efforts of employees, retirees and their families with matching funds to boost the amount of charitable donations to community organizations and/or provide employees in need with assistance.
2003 - Mississippi Power establishes a "green rate" for customers, an optional rate to contribute to the production or purchase of renewable energy - electrical energy produced using renewable resources.
2005 - Hurricane Katrina struck on August 29, taking down the company's electric system and leaving every single customer without service. A team of 12,000 - employees and crews from 23 states - restore service to all who can receive it in only 12 days.
2006 - Plant Daniel in Escatawpa, Miss., is selected for a multi-year research project to test carbon dioxide storage by the U.S. Department of Energy and the National Energy Technology Laboratory.
2006 - The Public Service Commission approves the company's plan to build a new Storm Center further inland and allowed the company to increase its storm reserve to $60 million.
2007 - The company's headquarters building, severely damaged during Hurricane Katrina, is officially rededicated, with the city's mayor recalling Mississippi Power President Anthony Topazi saying that the company would "come back better than ever, with a better presence in downtown Gulfport." On the second anniversary of Hurricane Katrina, Mississippi Power unveiled the commemorative sculpture, Forward, which is located on the plaza at its headquarters.
2007 - Mississippi Power announces a three-year total commitment to Mississippi State University's Early Childhood Education Institute.
2007 - Mississippi Power endows a professorship in electrical and computer engineering at Mississippi State University with a $500,000 commitment.
2007 - Mississippi Power teamed with the Mississippi Department of Wildlife and Fisheries to begin restocking the Pascagoula River after Hurricane Katrina's massive fish kill by releasing more than 2,500 largemouth bass advanced fingerlings.
2011 - Mississippi Power storm teams went to assist the utilities in Maryland and Washington D.C. in August following Hurricane Irene and returned to the east coast in November after a winter snow storm left more than 604,000 New Jersey utility customers without power.
2012 - Mississippi Power crews assisted Entergy Arkansas restore outages after an extreme winter storm crossed the nation through the December holiday season.
2012 - The company's expertly maintained infrastructure provided the necessary strength to withstand the full force of an extremely slow-moving Hurricane Isaac. With only a little more than 18,000 outages at the peak of the storm, crews aggressively worked to restore service to all customers less than 36 hours later.
2014 - In August, Plant Ratcliffe begins generating electricity from natural gas, delivering value to customers.
2017 - Mississippi Power becomes the state's largest partner in renewable energy with the dedication of three large-scale solar facilities, providing more than 105 MW and powering nearly 15,000 homes. A fourth project is approved that will provide 53 MW and power 8,000 homes.