Lower Valley Energy began in 1937 as Lower Valley Power & Light, Inc. with just 10 members signed up for this new cooperative.

As a result of diligent efforts of many citizens and Star Valley Power & Light, the town of Afton had electricity from 1907, but the farmers and rural residents in the rest of the valley went without this convenience until late in 1938. Congress passed the Rural Electrification Act in 1937, allowing cooperatives to borrow from the government to help rural areas to have electrical power. Lower Valley Power & Light, Inc. was established and received a mortgage note in the amount of $145,000 at 2.77% interest from REA.

More and more members signed up with this new cooperative. A generating plant was built, power lines were constructed and members started wiring and plumbing their homes in anticipation of electricity coming.

On November 12, 1938 the new plant and lines were energized. This was the day that had long been awaited, when 287 members started to receive electric service. The celebration was held in Freedom, Wyoming, the location of Lower Valley’s first office.

By the end of 1951 practically every farm and home in Star Valley, as well as Swan Valley and Irwin, were receiving electricity service, and continued to add new members and new services.

The next few years saw many miles of power lines constructed into areas like Greys Lake and Swan Valley in Idaho. A new generating plant was built on Strawberry Creek, near Bedford, Wyoming. The cost of the plant was approximately $590,000 and was one of the most modern plants in the West. On January 21, 1951, the Strawberry Plant was energized.

In 1952 Lower Valley Power & Light purchased Jackson Light and Power and Star Valley Power & Light Co., dissolving the two private companies. Their customers began receiving electric service from Lower Valley Power & Light, Inc., which now served virtually the entire northwestern area of Wyoming and parts of Idaho.

With continued growth (and based on the number of people served in Star Valley), the company moved the main office to Afton, Wyoming in 1954.

From 1938 to 1965 much progress was made. Members served increased from 287 to 4,450. The average KWH consumption increased from 76 in 1941 to 864 per consumer per month in 1965. The net KWH generated and purchased increased from 540,536 to 50,556,484 per year. The net worth of Lower Valley Power & Light, Inc. in 1965 was $5,489,032.

During this growth period, the service area was divided into five districts for director representation. The terms of office were to be staggered in order to have directors held over each year. A new modern office building was constructed in Afton complete with a warehouse. A new office building was also built in Jackson to handle accounts in the Jackson Hole area.

In 1962, Lower Valley Power & Light started paying Patronage Capital Credit refunds to its members.

In early 1996, after building liquid natural gas plants at both the Afton headquarters and Jackson office, Lower Valley Energy began distributing natural gas. The natural gas system started with approximately 2,500 customers (in 2018, nearing 5,000 customers).