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On October 1, 2026, China's renewable energy sector reached another milestone as the Qinghai Gonghe Million-Kilowatt photovoltaic and concentrating solar power Hybrid Project successfully connected to the grid. The project, located in Gonghe County, Hainan Tibetan Autonomous Prefecture, Qinghai Province, represents a new paradigm in solar energy deployment: combining photovoltaic generation with thermal storage to deliver dispatchable, round-the-clock clean electricity.

The project's scale is impressive by any measure. With a total installed capacity of 1 gigawatt, it comprises a 900-megawatt photovoltaic array and a 100-megawatt molten salt tower-type concentrating solar power station. The CSP portion features 10,310 heliostats with a total collection area of approximately 500,000 square meters, while the PV section utilizes 1.897 million photovoltaic modules. According to China Power Engineering Consulting Group, which constructed the facility, the project will generate an average of 2.2 billion kilowatt-hours annually, saving approximately 690,000 tons of standard coal and reducing carbon dioxide emissions by about 2.07 million tons each year.

What makes this project particularly significant is not just its size but its integrated approach to solar energy generation. The concentrating solar power component serves as a thermal energy storage system, capturing excess solar energy during peak daylight hours and releasing it as electricity during nighttime or cloudy periods. This solves one of the most persistent challenges facing renewable energy: intermittency. By storing energy in the form of heated molten salt, the facility can continue generating electricity long after the sun has set, effectively transforming solar power from a variable resource into a dispatchable one.

China Power Engineering Consulting Group designed the facility with a sophisticated integration strategy. During daylight hours, the heliostat field reflects sunlight onto the central receiver tower, heating molten salt to temperatures exceeding 500 degrees Celsius. This thermal energy is stored in insulated tanks and later used to generate steam, which drives conventional turbine generators. Meanwhile, the photovoltaic array generates electricity directly from sunlight, with excess power capable of being diverted to electric heating elements that further heat the molten salt storage system.

The project's location in Qinghai Province is no coincidence. The region boasts some of the highest solar irradiance levels in China, with annual sunshine hours exceeding 3,000 in many areas. Qinghai has already established itself as a renewable energy leader, having previously operated entirely on clean energy for extended periods. The Gonghe project adds significant capacity to the province's grid while demonstrating the viability of hybrid solar systems that can provide baseload-like reliability.

Thermal energy storage technology has been the key enabler for this hybrid approach. Molten salt, typically a mixture of sodium nitrate and potassium nitrate, serves as both the heat transfer fluid and the storage medium in concentrating solar power systems. The salt's high heat capacity and stability at elevated temperatures make it ideal for storing thermal energy over extended periods. Modern molten salt systems can maintain temperatures for up to 12 hours or more, allowing solar thermal plants to generate electricity throughout the night and during periods of cloud cover.

The integration of photovoltaic and concentrating solar power technologies represents an evolution in solar energy system design. Traditional photovoltaic systems, while cost-effective and widely deployed, cannot generate electricity without direct sunlight. Concentrating solar power systems with thermal storage can provide dispatchable power but at higher cost per kilowatt-hour than photovoltaics alone. By combining the two technologies, the Gonghe project achieves both low-cost generation during peak solar hours and reliable output during off-peak periods, optimizing the overall economics of solar energy deployment.

grid integration challenges have been a major barrier to renewable energy adoption worldwide. Solar and wind power generation fluctuates with weather conditions, creating uncertainty for grid operators who must balance supply and demand in real-time. The Qinghai Gonghe project addresses this challenge directly by providing predictable, controllable output from its thermal storage component. Grid operators can schedule generation from the CSP portion just as they would from conventional power plants, while the photovoltaic component provides additional low-cost energy when sunlight is available.

The project also demonstrates the maturity of China's concentrating solar power industry. Just a decade ago, CSP technology was largely confined to demonstration projects and pilot programs. Today, Chinese companies have developed complete supply chains for CSP components, including heliostats, receivers, thermal storage systems, and power blocks. The cost of CSP systems has declined significantly as manufacturing scale has increased and technology has improved, making hybrid PV-CSP systems increasingly competitive with other forms of dispatchable generation.

Automation and control systems play a critical role in the operation of hybrid solar facilities. The Gonghe project employs sophisticated control algorithms that optimize the dispatch of energy between the photovoltaic array, the concentrating solar power system, and the thermal storage. These systems must account for weather forecasts, electricity prices, grid demand, and equipment status to maximize both economic returns and system reliability. Advanced predictive algorithms can anticipate cloud cover and adjust system operation accordingly, minimizing the impact of transient weather events on power output.

The success of the Qinghai Gonghe project has implications for renewable energy deployment worldwide. As countries strive to meet climate targets while maintaining grid reliability, the ability to provide dispatchable solar power becomes increasingly valuable. Hybrid PV-CSP systems offer a pathway to high renewable energy penetration without the grid stability challenges that have limited solar adoption in many regions. The technology is particularly relevant for regions with high direct normal irradiance, including the Middle East, North Africa, southern Europe, and parts of the Americas.

Energy storage more broadly has become a central focus of China's energy transition strategy. The country has set ambitious targets for energy storage deployment, recognizing that storage technologies are essential for integrating high levels of variable renewable energy into the grid. Beyond thermal storage in concentrating solar power systems, China is deploying battery storage, pumped hydro storage, and other technologies at unprecedented scale. The Qinghai Gonghe project demonstrates how different storage technologies can be combined to create comprehensive solutions for renewable energy integration.

The project's construction was led by China Power Engineering Consulting Group's New Energy Division, with the Northwest Institute serving as the EPC contractor. The facility is owned and operated by PowerChina Renewables, a subsidiary of China Power Engineering Consulting Group. The project received support from national energy authorities as part of China's second batch of large-scale wind and solar power base construction initiatives, reflecting the government's commitment to accelerating renewable energy deployment.

Environmental benefits extend beyond carbon dioxide reduction. The project will also reduce emissions of sulfur dioxide, nitrogen oxides, and particulate matter that result from fossil fuel combustion. These pollutants contribute to air quality problems and public health issues, particularly in densely populated regions. By displacing coal-fired generation, the Qinghai Gonghe project contributes to broader environmental improvement while supporting China's carbon neutrality goals.

The project also demonstrates the potential for land use optimization in renewable energy deployment. By combining photovoltaic and concentrating solar power technologies on a single site, the facility maximizes energy output per unit of land area. This is particularly important in regions where land availability is limited or where competing land uses create constraints on renewable energy development. The hybrid approach allows developers to achieve higher capacity factors and better economic returns from limited land resources.

As the global energy transition accelerates, projects like Qinghai Gonghe will become increasingly important. They demonstrate that renewable energy can provide not just clean electricity but reliable, dispatchable power that can serve as the backbone of modern electricity grids. The integration of multiple generation and storage technologies creates systems that are greater than the sum of their parts, offering solutions to the intermittency challenges that have long been cited as barriers to renewable energy adoption.

Written by: Maxwell, an industrial automation specialist with over 15 years of experience in renewable energy systems and power grid integration. Maxwell has worked extensively with solar energy developers to implement advanced control systems and energy storage solutions that maximize the value of renewable energy generation.