Portals

The movie begins with title cards indicating dates and times in the future. However, the times listed incorrectly indicate it would be Standard Time as of the date provided (e.g. "August 5, 2020, 2:47 PM EST"). In actuality, it would be Daylight Saving Time in August 2020 and the times should be listed as EDT.

They show entire Earth going complete black out within seconds. But The effect of any energy surge cannot be equally distributed all over the Earth, there are different power generation plants using different technology, some use oil, some use coal, some use water, some even use solar and wind energy, so they will be effected differently. And, there are captive power generation plants also supplying electricity to a limit users, and their capacities are far more that the peak load. Plus, billions of people now have home generators and invertors/ batteries. Thus, there just cannot be a complete blackout on Earth. If the surge is not really affecting power generating plant, and is rather directly affecting electricity, then all electric devices, even mobiles and cars would also have gone inactive.