In Jennifer Haigh’s fifth novel Heat and Light, she returns to the fictional town of Bakerton, Pennsylvania: its prosperity withered with the closing of the coalmines. So when it’s learned that the area is rich in natural gas, many people are eager to sign over their mineral rights to energy companies. And the debate about fracking and all that it entails upends the community. Jennifer Haigh knows her subject well; she was raised in a former coal town that also sits on deposits of natural gas. In our conversation she talks about her hometown and how it’s become the basis for much of her writing, the pull of the past on the present and the legacy of North Appalachia’s geology.