I beg to differ - unless the situation has changed dramatically in the last two years since I left Yangon in 2010, there are still quite long power cuts in many districts. You are certainly right about the hotels - all mid-range and upper-class hotels have generators, so do many shops and businesses, for a generator is essential in Myanmar, as is a back-up water supply (for an expat, not a tourist, these are probably the most important things to keep in mind when looking for a place to live)