Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
energy-saving [ˈɛnədʒɪˈseɪvɪŋ] adj (device) сокраща́ющий расхо́д эне́ргии
energy-saving policy поли́тика эконо́мии эне́ргии
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.