TLS clients work primarily in the electric power and renewable energy fields, as well as in related fields such as data networking, telecommunications, computing and cybersecurity.

TLS clients have included:

• Siemens North America

• Siemens Germany

• General Electric

• Institute of Electrical and Electronic Engineers (IEEE)

• Smart Energy Consumer Collaborative

• Electric Power Research Institute

• Smart Grid Interoperability Panel

• Interprose PR

• Pennwell Publishing

• Spirae

• Utilities Technology Council

• Water Research Foundation