Alliant Energy-interstate Power And Light Company, Interstate Power And Light Company, Interstate Power And Light Company, F/k/a Ies Utilities, Inc., And/or Alliant Energy Corporation Vs. Bo Duckett, A/k/a Mary Duckett, F/k/a Mary E. Jeambey

CADY, Justice.

In this appeal, we must construe a natural gas utility’s tariff that provides for indemnity. The district court granted summary judgment for the utility, and awarded it indemnity from the customer. We reverse and remand.

I. Background Facts and Proceéd-ings.

Alex Saunders died from a natural gas explosion that occurred in his apartment on April 9, 2001. The apartment was located in Ames, and was part of a three-plex unit created from an old two-story single-family dwelling. Bo Duckett (Duck-ett) purchased the apartment building in 1984, and maintained it until the time of the…