Columbia Gas of Kentucky is offering an environmental incentive for customers who sign up for its paperless billing service.

Through April 1, Columbia Gas will donate $10 to The Nature Conservancy for each customer who switches to the paperless service. The donation will go toward inoculating more than 15,000 hemlocks in Kentucky's Bad Branch Nature Preserve against a deadly insect called the hemlock woolly adelgid.

The utility said the paperless billing program sends e-mail messages to customers when bills are ready, and the bills can be paid online at no charge.