Fiscal year 2026 brings multiple major institutional reforms to Japan's electricity market: capacity market price cap increases, significant renewable energy surcharge hikes, balancing market rule updates, and the launch of Chubu region electricity futures.
The imbalance fee (インバランス料金) is the core settlement mechanism underpinning Japan's simultaneous supply-demand balance requirement. This article examines its operating principles, the post-2022 calculation methodology, the policy rationale behind raising the corrected imbalance price cap (C value) from ¥200 to ¥300/kWh in April 2026, and how climate, electricity demand, and grid supply-demand dynamics collectively drive imbalance price volatility.
With the large-scale integration of solar and wind power, output curtailment has become a core challenge in Japan's power system management. This article analyzes curtailment trigger conditions, compensation calculation methods, differences under FIT/FIP schemes, and practical response strategies for power generators.
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