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Japan Grid-Scale Battery Storage — Operator Insights
LehmanSoft is a Japanese local battery aggregator and operator (運用代行). We own and run our own 2MW / 8.1MWh grid-scale battery in Saitama — trading on JEPX and entering the balancing market. These notes are for foreign IPPs, infrastructure funds and developers entering Japan's storage market and looking for a local operating partner.
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Grid-scale battery operation & aggregation service — JEPX, capacity and balancing-market optimization, by an operator that runs its own asset.
Japan's 2026 Balancing Market Overhaul: Price Cap Cut to ¥15, Required Volume to 1σ — How Battery Revenue Changes and How Multi-Market Operation Protects It
From the 13 March 2026 trading day, Japan's balancing market (primary through tertiary①) shifted to day-ahead, 30-minute trading, and the price cap for affected products was lowered from ¥19.51/ΔkW·30min to ¥15 (source: METI). Procured volume was simultaneously reduced from a 3σ to a 1σ basis. For grid-scale batteries that have relied on the balancing market as their main revenue source, this means a simultaneous decline in both unit price and volume. This article sets out exactly what changed, using primary sources, and then explains how multi-market operation defends revenue — written for battery owners and project developers.
AI-VPP Commercial Operation of a Grid-Scale Battery in Japan: Lessons From a Real 2MW/8.1MWh Site
How an AI-driven virtual power plant operator runs a real 2MW/8.1MWh grid-scale battery in Japan across JEPX and the balancing market—honest lessons for infra investors.
BESS Operation Outsourcing in Japan (運用代行): How Foreign Investors Choose an Aggregator and Operation Partner
A guide for foreign IPPs and infra funds on Japan BESS operation outsourcing (運用代行): aggregator licensing, tolling vs aggregation, and how to choose an operator.
How Grid-Scale Battery Storage Earns Revenue in Japan: JEPX, Capacity & Balancing Market Stacking
How grid-scale batteries stack revenue in Japan across JEPX, the capacity market, LTDA, and the balancing market — with 2026 rule changes explained.