Electricity in Chapala and Ajijic is 80% reliable. The time you have to worry about the most is during the rainy season, which is the summer. During July and August, it rains heavily for about an hour or two during each day. On average, a power outage happens for an hour or two every two weeks during the rainy season but in general, electricity is pretty stable if it’s not during the rainy season.
Many developing countries do not have a great deal of long-term vision when they set up the construction of their infrastructure. For example, in the city of Guadalajara, there is so much new construction and even here, we they are building some high-rise buildings, that there is not sufficient infrastructure in place beforehand.
Some people just get construction deals without putting up the fiber optic networks, for example. I highly doubt that the area where I am and within half a mile radius will have fiber optic wiring any time soon. Meanwhile, I make up for it in other ways. I just got a really nice Apple computer, which is very fast that even though the Internet may be slow, my computer is fast. I have back up batteries that last up to 4 hours so in case the electricity goes off for a couple of hours, I am set. I have noticed, however, that the reliability of electricity in the Chapala and Ajijic areas have improved.
If it’s not the rainy season, the electricity might go out only once every 2 months. Electricity may also go out when somebody accidentally hits a light pole, a transformer burns, or something like that. If the transformer goes then you might go half a day to one full day without electricity. But I have only seen that happen once in the three years that I’ve been here.