2026-2030 China's $700 Billion Grid Investment Outlook: Why Secondary Circuits and Protection Systems Deserve More Attention
China's 15th Five-Year Plan (2026–2030) | Power Grid Modernization | Protection & Control | Industry Insights
China is entering a new phase of power infrastructure development.
According to information released by the China Electricity Council in July 2026, the country's total fixed-asset investment in power grids is projected to exceed RMB 5 trillion (approximately USD 700 billion) during the 15th Five-Year Plan period (2026–2030), representing an increase of more than 80% compared with the previous five-year period.
Meanwhile, China aims to enable the efficient integration and utilization of more than 2.8 TW of renewable energy capacity by 2030.
These figures highlight the scale of the transformation underway. But for electrical engineers, equipment manufacturers, and technology providers, the more important question is:
Where will this investment go, and how will it change the technical requirements of tomorrow's power systems?
China's latest energy policies point toward a grid that is more interconnected, digitally enabled, flexible, and resilient.
As renewable generation, battery energy storage, electric vehicles, and data centers continue to expand, power networks must accommodate increasingly complex power flows, more dynamic operating conditions, and higher expectations for supply reliability.
For the protection, control, and automation industry, these changes have implications that extend well beyond major infrastructure projects.
They reach directly into secondary circuits, auxiliary relays, monitoring systems, control interfaces, and the components responsible for ensuring that electrical equipment operates correctly when it matters most.
1. What China's 15th Five-Year Plan Means for Power Grid Development
China has introduced a series of policies defining its priorities for modernizing the national power system through 2030.
Three policy directions are particularly relevant to the protection and control industry.
1.1 Building a More Coordinated and Resilient Power Grid
In December 2025, China's National Development and Reform Commission (NDRC) and National Energy Administration (NEA) issued the Guiding Opinions on Promoting High-Quality Power Grid Development.
The policy calls for:
“Accelerating the construction of a new power grid platform with coordinated development of transmission, distribution, and microgrids.”
By 2030, China aims to establish the initial framework of a new grid architecture supported by backbone transmission networks and distribution systems, complemented by intelligent microgrids.
This is a significant shift in power system development.
Historically, electricity has largely flowed from centralized generation facilities through transmission and distribution networks to end users.
Today, distributed solar generation, battery storage, and other decentralized energy resources are transforming that architecture.
Power can increasingly flow in multiple directions.
For protection engineers, this introduces additional complexity.
Changes in fault-current contribution, power-flow direction, network topology, and operating conditions can affect protection coordination and relay settings.
Protection schemes originally developed for predominantly unidirectional networks may require reassessment when distributed energy resources are introduced.
This creates new requirements not only for intelligent protection devices, but also for the secondary circuits responsible for signal acquisition, switching, control execution, and equipment status feedback.
1.2 Distribution Networks Are Becoming Active, Digital, and Bidirectional
The same policy emphasizes the need to accelerate the flexible, intelligent, and digital transformation of distribution networks.
It also calls for the transition from traditional passive, unidirectional distribution systems toward active networks capable of bidirectional interaction.
For engineers working with medium-voltage switchgear, protection systems, and distribution automation, this is a particularly important development.
As distributed energy resources become more widespread, distribution networks will need to manage:
More complex protection coordination and fault isolation.
Remote switching and automated restoration.
Continuous monitoring of circuit breaker and equipment status.
Voltage quality and power-flow management.
Communication between field devices and supervisory control systems.
These capabilities depend on reliable coordination between primary equipment, protection devices, automation terminals, and auxiliary control circuits.
A remote switching command, for example, is only effective if the associated control circuit can execute it correctly.
Similarly, automated fault isolation depends on accurate equipment status information and dependable signal transmission.
As distribution networks become more intelligent, the quality and reliability of field-level control and monitoring systems become increasingly important.
1.3 Renewable Energy Integration Is Raising the Requirements for Protection and Control
China's 15th Five-Year Plan for New Power System Development sets a target of accommodating more than 2.8 TW of renewable energy capacity by 2030.
The country also aims to increase the share of electricity generated from non-fossil energy sources to 50%, compared with approximately 42.3% in 2025.
These targets reflect the continued transformation of China's electricity generation mix.
However, high renewable penetration introduces challenges that traditional power systems were not originally designed to handle at this scale.
Wind and solar generation are variable. Battery storage introduces additional operating modes, while inverter-based resources can produce fault-current characteristics that differ from those of conventional synchronous generators.
Protection systems must therefore account for changing system conditions and increasingly diverse fault scenarios.
Yet even the most sophisticated protection algorithm relies on the successful operation of its associated secondary circuits.
Current and voltage signals must be transmitted accurately. Control circuits must operate as designed. Circuit breaker status indications must be dependable.
The reliability of a protection system ultimately depends on the complete chain of measurement, decision-making, and control execution.
2. Where Are the Market Opportunities for Protection and Secondary Circuit Equipment?
The projected RMB 5 trillion investment represents an important indicator of China's long-term commitment to grid modernization.
However, it is essential to distinguish total grid infrastructure investment from the addressable market for protection, automation, and secondary circuit equipment.
The overall investment includes transmission lines, substations, distribution infrastructure, civil engineering, primary electrical equipment, and other construction activities.
For specialized technology providers, the most relevant opportunities will emerge from specific engineering applications and equipment requirements.
Four areas deserve particular attention.
2.1 Distribution Grid Modernization: Beyond Primary Equipment Replacement
For many years, distribution network investment focused heavily on expanding coverage, increasing capacity, and improving physical infrastructure.
The growing presence of distributed energy resources is changing these priorities.
Modern distribution systems increasingly require advanced fault detection, automated switching, remote operation, condition monitoring, and coordinated protection.
These capabilities can create additional demand for secondary equipment, including:
Auxiliary relays and control interface modules.
Circuit supervision and monitoring relays.
Signal conditioners and isolation modules.
Circuit breaker control and monitoring devices.
Control power supply and auxiliary power modules.
Consider a medium-voltage switchgear modernization project.
Replacing a circuit breaker or introducing an intelligent protection device may also require modifications to auxiliary contacts, trip and close circuits, position indication, control power, and alarm interfaces.
The engineering challenge is to ensure that the upgraded system operates reliably as an integrated whole.
At the same time, greater equipment integration may reduce the number of standalone components required in certain applications. Actual market demand will therefore depend on system architecture and project specifications.
2.2 Renewable Energy Substations: Reliability in Unattended Operation
Large-scale wind and solar projects depend on substations that connect renewable generation facilities to the wider transmission and distribution network.
Many of these facilities operate with limited on-site personnel and rely heavily on remote supervision.
This makes dependable protection, control, and monitoring particularly important.
Consider voltage transformer (VT/PT) secondary circuits.
Reliable voltage measurement, correct voltage selection or switching, and timely detection of abnormal circuit conditions can be essential to the performance of protection and automation systems.
Similarly, circuit breaker control systems must provide reliable switching execution, position indication, and abnormal-condition monitoring.
In an unattended substation, a secondary circuit failure that remains undetected can complicate troubleshooting and delay equipment restoration.
This creates opportunities for solutions supporting:
VT/PT voltage switching and monitoring.
Trip and close circuit supervision.
Centralized alarm annunciation.
Protection testing and maintenance.
Remote signal monitoring and communication management.
As renewable power infrastructure expands, secondary circuit reliability is likely to remain a key engineering consideration.
2.3 Existing Substation Upgrades: A Long-Term Modernization Market
China already operates an extensive network of substations, switchgear installations, and industrial power distribution systems.
Many existing facilities will require progressive modernization as equipment ages, operational requirements evolve, and maintenance challenges increase.
In medium- and high-voltage installations, secondary control systems may include numerous auxiliary relays, selector switches, indication devices, alarm circuits, and power supply components.
Modernization is rarely as simple as replacing one device with another.
Engineers must verify contact ratings, operating times, insulation performance, interface compatibility, and control logic.
They must also consider the maintainability and long-term availability of replacement components.
For critical infrastructure, proven reliability, technical documentation, standardized interfaces, and testing capabilities can be just as important as initial equipment cost.
This makes equipment replacement and secondary circuit modernization a potentially sustainable opportunity for specialized manufacturers.
2.4 Energy Storage and Microgrids: More Operating Modes, More Control Requirements
Battery energy storage and microgrids are introducing additional operating flexibility into power networks.
Depending on the system architecture, microgrids may operate in grid-connected or islanded modes. Energy storage facilities may support load shifting, backup supply, frequency regulation, and other grid services.
These applications require appropriately coordinated protection, monitoring, and control systems.
Circuit breaker operation, auxiliary power transfer, alarm monitoring, and synchronization checks may all be relevant, depending on the installation.
For secondary equipment manufacturers, this creates potential applications in signal isolation, power supply management, control interfaces, monitoring relays, and communication modules.
The actual configuration, however, must always be determined by the electrical system design and applicable technical standards.
3. What Are Global Industry Leaders Saying?
China's policy direction is increasingly reflected in the activities and public statements of international power technology companies.
Although their perspectives differ, several common themes emerge: grid resilience, renewable integration, digitalization, and infrastructure modernization.
Hitachi Energy: Resilience and Flexible Grid Infrastructure
In September 2026, James Zhao, Head of North Asia at Hitachi Energy, discussed China's energy transition during the International Senior Economic Advisory Conference of the Shaanxi Provincial Government.
According to Hitachi Energy's official announcement, Zhao emphasized the importance of efficient, secure, and resilient energy infrastructure as China accelerates the development of its new energy system during the 15th Five-Year Plan period.
He also highlighted opportunities associated with renewable electricity transmission, grid flexibility, sustainable power technologies, and digital energy solutions.
For protection and control engineers, resilience is more than a system-level concept.
It depends on the ability of equipment and networks to withstand disturbances, respond correctly to abnormal conditions, and restore normal operation efficiently.
Protection coordination, equipment monitoring, reliable control circuits, and maintenance practices all contribute to this capability.
ABB: Smart Distribution and Digital Energy Systems
In July 2026, ABB organized an energy development and industrial ecosystem summit in China, bringing together industry stakeholders to discuss new energy systems, renewable integration, and the application of artificial intelligence in power infrastructure.
ABB presented technologies associated with smart distribution, digital energy management, direct-current applications, and integrated energy systems.
The discussions reflected the increasing convergence of electrical engineering and digital technologies.
For equipment manufacturers, this transformation raises an important consideration.
Advanced monitoring platforms and intelligent algorithms depend on reliable information from field devices.
A digital system cannot make effective operating decisions if circuit breaker indications are inaccurate, control signals are lost, or auxiliary equipment fails to respond correctly.
As power networks become more digital, dependable field-level components remain essential.
International Energy Agency: Distributed Energy Is Changing China's Grid Requirements
In September 2025, the International Energy Agency (IEA) published Integrating Distributed Energy Resources in China.
The study examined the rapid expansion of distributed solar generation, battery storage, and electric vehicle charging infrastructure in China.
It highlighted the need for stronger distribution network planning, improved operational practices, and greater digital capability to accommodate these resources effectively.
This assessment reinforces a broader industry trend.
As the number and diversity of connected energy resources increase, power networks need more accurate monitoring, adaptable protection strategies, and reliable control infrastructure.
For secondary circuit equipment manufacturers, long-term competitiveness will increasingly depend on meeting these application-specific requirements.
4. What This Means for ODES and the Future of Secondary Circuit Reliability
China's grid modernization strategy reflects a wider transformation taking place across the global power industry.
Electrical networks are becoming more complex, distributed, and digitally connected.
For ODES, a specialist in power system secondary circuits, these developments reinforce the importance of reliable protection, control, monitoring, and signal-processing technologies.
Our work focuses on three closely connected engineering priorities.
Reliable Protection and Control Interfaces
Auxiliary relays, monitoring relays, signal conditioners, and power supply modules perform essential functions within secondary systems.
Depending on their application, these components support contact multiplication, signal conversion, electrical isolation, circuit supervision, and auxiliary power.
Their performance must be evaluated against practical engineering requirements, including operating accuracy, insulation performance, electromagnetic compatibility, and long-term reliability.
Safer and More Efficient Protection Testing
As existing substations undergo modernization, protection testing and maintenance become increasingly important.
Products such as ODES TestBlock provide defined interfaces for protection testing and circuit isolation procedures.
When properly selected and used according to approved engineering procedures, standardized test interfaces can help improve maintenance consistency and facilitate safer testing operations.
Monitoring and Alarm Management for Unattended Facilities
Renewable energy substations, intelligent distribution networks, and industrial power systems increasingly depend on remote monitoring.
Applications involving VT/PT voltage switching, breaker auxiliary control, centralized alarm annunciation, and communication management can help support accurate equipment status reporting and more effective maintenance.
Across these applications, our objective remains consistent: to develop secondary circuit products and solutions around real engineering requirements, supported by technical validation, standardized design, and controlled manufacturing processes.
5. The Next Five Years: Grid Intelligence Must Be Built on Reliability
China's 15th Five-Year Plan represents a significant opportunity for the global power equipment industry.
The scale of expected grid investment is substantial, but the underlying technical transformation is even more important.
Renewable energy integration, intelligent distribution networks, aging infrastructure upgrades, and new forms of energy storage will place increasing demands on electrical protection and control systems.
For equipment manufacturers, future competitiveness will depend on more than individual product features.
System compatibility, verified performance, maintainability, and reliable long-term delivery will play an increasingly important role.
For protection engineers, the fundamental challenge remains familiar: ensuring that every part of the protection and control system performs its intended function under real operating conditions.
The power grid of the future will require advanced digital intelligence. It will also depend on something equally fundamental: reliable signals, dependable control circuits, and correct operation at every critical moment.
That is where the next generation of secondary circuit engineering will continue to make a difference.
Sources and research notes: This article is based on publicly available Chinese policy documents, investment outlooks, official corporate statements, and IEA research available as of October 10, 2026. Descriptions of corporate perspectives are paraphrased from official publications rather than presented as verbatim quotations. The projected RMB 5 trillion investment refers to total grid fixed-asset investment, not the addressable market for secondary circuit equipment.
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