The cover of Korean boy band Shinhwa's "Come On" received huge publicity in Taiwanese pop culture due to its catchy hook.

"Ra-Men Song" was used in an instant noodles commercial, the track featuring Singapore's Terry Lee rapping alongside Energy in English.

Energy's third and final album as a five-member band E3 contained the single "Capturing Evil" (退魔錄), a song used to promote an online computer game.

A Limited Edition release of this album included a VCD promoting Michael's Dance, a television drama serial that the band was shooting at that time.

The show's soundtrack contained songs recorded by Energy, including "Hey You", "I Hear the Angels Sing" (我聽見天使歌唱) and "Dark Times" (黑暗時期).

After a series of FINAL FANTASY concerts, Milk turned to his solo career of hosting, advertising, and recording an EP titled "Puppet", released in 2006.

After a year of inactivity, three-member Energy released an album New Generation (猩人类) in 2006, featuring a rock influenced sound and a new band logo.

The music video of title track "New Generation" (猩人类) depicted the band dancing with extended arms, matching the album's ape-man theme.

Penny wrote the lyrics for power ballad "Love Went Out of Control" (愛失控), although its tune was a cover of "One" by Korean boy band TVXQ.

Energy's 2007 album Born To Be Bad (天生反骨) received generally positive reviews, mainly praising the band's improved vocals.

The title track "Born To Be Bad" (天生反骨) received huge radio play and publicity because of its unique mix of hip-hop and rock.

In 2 April 2023, they reunited as a special guest during Mayday's concert tour Noah's Ark 10th Anniversary Evolution Reissue Limited Edition, presenting song "Letting Go" and "Sun Wukong".