Group 1 - The article discusses tax incentives for enterprises engaged in biogas comprehensive development and utilization projects, specifically highlighting the "three exemptions and three reductions" policy for corporate income tax [2][3]. - Taxpayers involved in biogas projects related to livestock and poultry breeding will be exempt from corporate income tax for the first three years and will have a 50% reduction for the next three years after the first revenue is generated [2][3]. Group 2 - Conditions for enjoying the tax benefits include having a single biogas unit with a minimum volume of 300 cubic meters and an average daily biogas production of at least 300 cubic meters, complying with national technical standards [3]. - Projects must ensure that wastewater discharge, waste residue disposal, and biogas utilization meet national and local standards to avoid secondary pollution [3]. - The project must include complete facilities for raw material pretreatment, comprehensive utilization or further processing of biogas residues and liquids, and systems for biogas purification, storage, distribution, and utilization [3].

Core Viewpoint - The article discusses tax incentives for enterprises involved in public infrastructure projects supported by the state, highlighting the "three exemptions and three reductions" policy for corporate income tax [3][10]. Summary by Relevant Sections Tax Incentives - Enterprises engaged in state-supported public infrastructure projects can enjoy corporate income tax exemptions for the first three years and a 50% reduction for the next three years, starting from the year they first generate operational income [3][10]. Eligible Projects - The public infrastructure projects eligible for these tax incentives include ports, airports, railways, highways, urban public transport, electricity, and water conservancy, as specified in the "Public Infrastructure Project Corporate Income Tax Incentive Directory" [4][10]. Conditions for Enjoyment - To qualify for the tax incentives, enterprises must meet specific conditions outlined in the "Public Infrastructure Project Corporate Income Tax Incentive Directory," including the requirement for projects to be independently functional and accounted for separately [5][10].