The City of Ember by Jeanne DuPrau

A city buried below the ground for over 200 years. The citizens have no clue that their dark sky is really underneath everything. More than 200 years underground is taking a toll on the city's electricity and resources. Blackouts are becoming more common as the city is falling apart. Doon Harrow realizes something is wrong, but without his friend Lina Mayfleet, the city may just die without a solution to be found.

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I'll admit, I was a little skeptical to read something called The City of Ember when I learned it was about people who were basically buried alive. However, when I started to actually read the story, I couldn't put it down. I liked reading about how the city worked and saddened when I realized they were underground and never had seen a blue sky. (I knew from the beginning they were underground, but it really hit me in chapter 10.)

I am looking foward  to reading the sequel, The People of Sparks.