Inner Mongolia Power Group has connected its grid with Mongolia's central region, marking a shift from point-to-point dedicated supply to network-to-network cross-border interconnection.

The project was energized at 00:32 on September 16, when Mongolia's Tavantolgoi substation was connected to the Inner Mongolia grid, along with three newly integrated 220 kV substations, the company said.

The project is listed under the autonomous region's nine-point action plan for Belt and Road cooperation and the China-Mongolia-Russia Economic Corridor. It supports the region's role as a gateway for China's opening-up and is expected to deepen grid connectivity, boost cross-border consumption of clean energy from western Inner Mongolia, and secure power supply for industrial, mining and residential users along the route.

Since Mongolia formally proposed increasing power supply to its central and southern regions in February 2023, Inner Mongolia Power Group has signed a memorandum of understanding, a power purchase agreement and a grid interconnection dispatch agreement with Mongolian counterparts, establishing a cross-border cooperation model covering routine dispatch, standardized maintenance and integrated operations.

On July 7, 2026, Mongolia's newly built Tong Oyu 220 kV switching station was connected to the Inner Mongolia grid, completing the first phase of power transmission. On September 3, power was successively delivered to the Oyu Tolgoi and Tsagaan Suvarga substations, marking the first time the Inner Mongolia grid carried a 220 kV high-voltage station in Mongolia. On September 16, the Tavantolgoi substation was connected, bringing the project into full operation.

The two sides completed 57 tasks across three phases, resolving technical barriers to cross-border grid interconnection and aligning eight technical standards and 15 operational procedures. Inner Mongolia Power Group sent five batches of technical teams to Mongolia to assist with equipment commissioning and power transmission.

Inner Mongolia Power Group has built a multi-level cross-border power network covering nine transmission lines from 10 kV to 220 kV and serving five border ports. Large mining projects such as Mongolia's Tsagaan Suvarga copper-molybdenum mine and Tavantolgoi coal mine, along with residential users, will receive stable power supply.

Under a multi-year green power purchase agreement, the company is developing a cross-border green power and green certificate trading mechanism with Mongolia. The share of green power exported to Mongolia will exceed 40%, supporting China's carbon peak and neutrality goals.