Balancing market platforms enable system operators to procure reserve and ancillary services through transparent, competitive market mechanisms. Instead of relying only on administratively procured reserves or bilateral arrangements, qualified resources bid into standardized products that reflect system needs such as frequency control, supply-demand balancing, renewable forecast-error management and contingency response. These resources can include generation, pumped hydro, battery storage, self-generation and demand response, provided they meet technical performance requirements. 

As renewable penetration increases, balancing needs become more dynamic because system operators must manage larger forecast errors, shorter-term variability and unexpected changes in supply or demand. A dedicated balancing market helps create clearer price signals for flexibility, expands participation beyond conventional generators and can improve the efficiency of reserve procurement. By defining products according to response time, duration and operational purpose, the platform allows different technologies to compete to provide the flexibility services most suited to their capabilities. 

Main Outcomes of the Solution 

• Reliability and flexibility: Supports frequency control, supply-demand balancing and contingency response by procuring reserve products with defined technical requirements. 
• Affordability: Can improve procurement efficiency by allowing multiple resource types to compete to provide balancing services, helping reduce reserve procurement costs where markets are liquid and well designed. 
• Institutional efficiency and transparency: Creates standardized products, market rules and published trading information that improve transparency and neutrality in reserve procurement. 

Key Deployment and Scaling Factors 

1. Define balancing products clearly, including response time, duration, activation conditions, locational requirements and performance standards. 
2. Establish resource-neutral participation rules that allow generation, storage, self-generation and demand response to compete if they meet technical requirements. 
3. Develop market systems for bidding, clearing, dispatch, settlement, performance assessment and publication of trading results. 
4. Coordinate balancing market operation with transmission system operation, renewable forecasting, congestion management and imbalance settlement. 
5. Set transparent governance, monitoring and penalty arrangements to maintain market confidence and reliable delivery of contracted reserves. 
6. Ensure telemetry, metering, communications and cybersecurity standards are sufficient for near-real-time activation and verification. 
7. Align market rules with broader system planning and investment signals so flexibility providers can build credible revenue stacks.  

Case study 

Electric Power Reserve eXchange Balancing Market (2024), Japan 

Japan’s balancing market is used by general transmission and distribution operators to procure reserves for frequency control and supply-demand balancing. The market was established in April 2021 as part of broader electricity market reform to support cross-regional procurement of balancing capacity, improve transparency and reduce adjustment costs through competition.  

The market was introduced in phases. Tertiary reserve 2 began in fiscal year 2021, tertiary reserve 1 in fiscal year 2022 and, from fiscal year 2024, primary reserve, secondary reserve 1 and secondary reserve 2 were introduced, enabling market trading across all five product categories. Participation can include thermal generation, pumped hydro, battery storage, self-generation and demand-response providers that meet technical requirements.  

EPRX began operating the balancing market from April 2024, taking over from the earlier structure operated by Japan’s general transmission and distribution operators. Its role is to support stable, transparent and neutral market operation as the importance of balancing procurement grows with renewable integration and power-market reform.  

The case shows how a national balancing market can create a structured route for multiple flexibility resources to provide reserve services. By fiscal year 2024, Japan’s balancing market had introduced all five reserve product categories, covering response times from fast primary reserves to slower tertiary reserves. The market framework expanded participation beyond conventional thermal generation to include batteries, pumped hydro and demand-response providers, supporting more flexible system operation as renewable penetration and short-term balancing needs increase. 

References: 

1. 一般社団法人 電力需給調整力取引所 
2. Organization Overview | About the Electricity Supply and Demand Adjustment Exchange | Electricity Supply and Demand Adjustment Exchange