Ingeteam and Istem to deploy energy recovery system for Barcelona Metro Line 9 November 18, 2015 | Europe News Spain-based Ingeteam Power Technology, S.A. and Istem S.l. will install an energy recovery system at a traction substation for Barcelona Metro Line 9. The system will enable recovery of 10 per cent to... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password