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Mexico's state power company CFE is 40% complete with the revamp of electrical infrastructure in Mexico City's historical center, the company said in a statement.
The company signed a project agreement with the federal district (DF) government in November 2010. At the time, the state firm and the DF government said works would begin in January 2011 and run 18 months.
CFE had pegged the cost of the modernization at an estimated 700mn pesos (US$50.6mn).
CFE took over power service to Mexico City and surrounding areas from defunct state energy company Luz y Fuerza del Centro in November 2009.
Demand in the area has reached some 50MW versus 10MW 40 years ago when the current system was built.