On this date, 2 September 1859 your planet was struck by a massive solar storm which caused the Carrington Event.
Read about it. A powerful solar wind struck the Earth. The “Northern Lights” were visible in the Caribbean. You could read by them at night. Telegraph wires melted.
Life was not affected much at that time, because so few things used electricity.
One of these days, once again, there will be a huge coronal mass ejection from your planet’s yellow star that strikes your planet square on. The result will be a vast electromagnetic pulse which fries almost all your electronic stuff. You will be plunged in an instant back to something like the 19th century. Within months, the larger part of the world’s population would probably be dead in the horrifying aftermath.
Will you have what it takes to survive?
On the other hand, perhaps there will be nuclear attacks that cause EMPs, or perhaps there will be a pandemic or other natural events which brings down the world’s economy, resulting in much the same.
Here are a few books you can try out, just to scare the stuffing out of you.
Lights Out by David Crawford
One Second After by William R. Forstchen (a sequel – One Year After)
Dark Grid by David. C. Waldron
The following isn’t a CME/EMP scenario, but the effects are in many respects the same.
Patriots by James Wesley Rawles.