There are 3 books in the Powerless Nation series. The newest book is Sabotage which came out in 2015.

1
Outage

Book cover of Outage
When fifteen-year-old Dee is left at her grandpa's farm in rural Washington, she thinks her life is over. She may be right.

An electromagnetic-pulse attack has destroyed the country's power grid, sending the United States back to the Dark Ages. Now Dee and Grandpa must face a world without electricity…
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2
Voyage

Book cover of Voyage
In this harrowing companion novel to Ellisa Barr's book, Outage, the devastating effects of an EMP attack are experienced all over again, only this time the story unfolds on a cruise ship far out to sea. Sena Morgan has just begun the voyage of a lifetime, but she'll never reach…

3
Sabotage

Book cover of Sabotage
Dee's parents are home from their ill-fated cruise, but there's no time to adjust to life “off-grid.” A menacing ex-military leader threatens their small town. After Dee narrowly avoids being conscripted into his youth army, she is forced to watch her friends suffer at his hands. She will risk everything…