DOE is about Energy efficiency requirements for products managed by US Energy Department，related products must meet federal regulations (10 CFR 430) requirements，it must be registered and recorded to DOE for the previous sales.After that the product could be checked online at DOE official website.For external power supply,Should reach the minimum energy efficiency rating IV grade,and marked out on the product clearly. 
Standard basis:Code of Federal Regulations:10CFR429&10CFR430.
Between them.10CFR429 provides sample selection specifications and report specifications.
10CFR430 specifies test methods and Declaration of Conformity specification.

TXB  testing has been recognized by the US Department of Energy,became a qualified laboratory accredited by DOE,which will help you complete the test, submission, registration full set of processes.
To learn more about DOE certification ,please contact with our relevant staffs.