Apparently it was NOT a transformer fire as originally reported...

Con Ed can’t explain what caused the Manhattan blackout

https://nypost.com/2019/07/14/con-ed-cant-explain-what-caused-the-manhattan-blackout/

Now, another site claims that the FBI used an EMP device to shut down the power so they could raid the CIinton Foundation offices without triggering the elaborate electronic security there. The device was claimed to be the Counter-electronics High-powered Microwave Advanced Missile system, which is actually a drone, and about here (pic related):

https://www.fool.com/investing/general/2015/05/24/boeing-unveils-electromagnetic-pulse-weapon.aspx

Unfortunately I can’t name the site where I found the claim because some anons scream bloody murder at the mere mention of it.