Just google the load shedding news in both country in the last one year, you will get an impression.In urban areas of BD, load shedding is minimal.In rural areas, no more than 2-3 hours average, in some place less than this and some places more.For Pakistan, even Karachi experience 8-12 hours load shedding.
Parts of Karachi facing load-shedding of upto 12 hours
https://tribune.com.pk/story/1526784/parts-karachi-facing-load-shedding-upto-12-hours/
Severe winter requires actually more electricity than hot summer. In those countries, central heating is the compulsory part of the home.And it requires a lot of electricity.With winter running for 6-8 months, you can guess the amount of electricity requirement to warm the house in a single year.Second biggest is the extensive use of AC in hot summer countries.You should compare per capita electricity consumption figure for Singapore with those of Canada, Norway, Saudi Arabia UAE. All of these countries are highly developed, but see Singapore's electricity consumption vary how much with other countries in the list.A hint: Singapore is called perpetual spring country.
In BD, Central heating is not required and uses of AC also less compared to very hot summer country like Pakistan.