According to official website of Tianjin Energy Group, Tianjin Gas Resources and Tianjin Energy are the same company. Tianjin Gas Resources is a gas company under Tianjin Energy Group, which is mainly responsible for gas supply and service in Tianjin.
Tianjin Taihua Gas Co., Ltd. is a four-level enterprise under Tianjin Energy Investment Group Co., Ltd., while Tianjin Huarun Gas Co., Ltd. and Tianjin Binhai Gas Group Co., Ltd. are joint-stock state-owned assets enterprises.