Elster Oil & Gas is an oil and gas company based in Highland Ranch, Colorado. The company was formerly known as Tekton Energy and has sold the majority of it`s assets in May 2014.

The remaining assets consist of acreage in the Wattenberg Field area of Northeastern Colorado.

The company is focused on the development of land as a non-operator. Since 2015, the Company has participated in the development of approximately 40 wells. Participation in further drilling is planned for 2019.