1948

• American Gas and Power Co. changed its name to Minneapolis Gas Co. and acquired all the assets of Minneapolis Gas Light Co.

1947

• Minneapolis Gas Light Co. switched entirely from manufactured gas to natural gas, needing to convert 370,000 appliances to run on "straight" natural gas instead of mixed gas.

1945

• First employee retirement plan at HL&P became effective on July 1.

1943

• HL&P's ties with the holding company, National Power & Light, severed on May 14.
• HL&P's common stock is listed on the New York Stock Exchange, and trading began on August 16.

1940

• Sealy electrical property purchased from Central Power & Light on October 8.
• First medical insurance plan for employees at HL&P became effective October 1.