In addition, the city's density poses extraordinary challenges for readying cell sites with backup power and then getting them back online when outages happen.
Although Messrs Munoz Ledo, Rubio Barthell and Bellizia Aboaf appeared to find their London trip fruitful, I couldn't help feeling they were looking forward to gettingback to the less frigid climes of Mexico, where solar power - as they remarked - seems a much more viable venture.