PARIS, FRANCE: Helexia, a subsidiary of Voltalia, has won an additional 27 megawatts of photovoltaic capacity for the Vivo cell phone network, a Telefonica brand. Helexia is a distributed-generation and energy-efficiency specialist. Following the August 31 launch of the construction of 17 solar photovoltaic (PV) units to power the facilities of Vivo, a subsidiary of…