The article presents an authoring system of indicators for the balanced development of the grain subcomplex in the Saratov Region, integrating environmental, social, and governance (ESG) criteria. The object of the study is the grain subcomplex of the Saratov Region. A methodology for developing an integral sustainability indicator, adapted to regional specific features, has been designed. The study resulted in the creation and substantiation of a system comprising 15 key ESG indicators, including their weighting coefficients, threshold values, and an integrated ESG index calculation model. This enables a quantitative assessment of the level of balanced development within the subcomplex. Threshold values for the indicators are proposed, along with practical recommendations for implementing a monitoring system. The findings can be applied by agricultural sector authorities for strategic planning and enhancing the competitiveness of regional grain production, in line with global sustainable development trends.