[2] The Delaware Thunder were announced as a member of the Federal Prospects Hockey League on May 29, 2019.

[3] The Thunder are owned by Delaware Pro Hockey LLC, an investment group led by Charlie Pens, who also serves as the president and general manager of the team.

To accommodate the team's arrival, the rink's seating capacity was expanded to approximately 700 for the 2019–20 season.

The Thunder broke the streak previously held by the Battle Creek Rumble Bees, which was 24 games.

[7] In June of 2024, during the league meetings, the Thunder were kicked out of the FPHL after not paying dormant fees.