Public data shows Japan’s energy storage system market reached 16.2 GW in 2025, with a projected expansion to 30.4 GW by 2034. Driven by targets for renewable energy grid integration and growing demand for grid stability, large-scale energy storage projects are being rolled out at a rapid pace, while leading Chinese energy storage enterprises have launched substantial market deployment in Japan.

Despite robust market growth, the rollout of grid-side energy storage facilities lags far behind the installation of wind and solar power assets. The Japanese market, characterized by stringent standards, high asset value and high entry barriers, imposes extreme requirements on supply chain delivery capabilities for Chinese energy storage manufacturers.

Specializing in international logistics for new energy sectors, Sungreen Logistics has accumulated extensive practical experience and project track records in large-scale energy storage logistics. The company’s New Energy Division maintains efficient operations and persistent technical breakthroughs, consistently leading the industry in delivery schedules for large storage projects. Before the close of Q1 2026, the firm was awarded a 160 MWh large-scale energy storage logistics transportation contract for Client C’s shipments bound for Japan. In the niche segment of large energy storage project logistics, Sungreen Logistics has forged its own efficient workflow and built unmatched operational confidence.

Overlapping Core Challenges Create Severe Barriers for Overseas Project Delivery

The project covered the transportation of 32 units of 20HQ energy storage containers, each weighing up to 43 tons. Though seemingly a standard energy storage export order, the shipment faced daunting obstacles from the very start due to multiple special restrictions in Japan, including vessel load limits, port crane capacity, terminal operation regulations, oversize road permits and overland transportation rules, leaving significant uncertainties throughout the entire process.

Challenge 1: Terminal Crane Load Limits Force Complete Vessel Type Switch

Container vessels serving Japan’s trade lanes mainly call at major ports including Osaka, Tokyo, Yokohama, Nagoya and Kobe. Except for Yokohama, container gantry cranes at most other terminals only support cargo under 40 tons, making them incapable of unloading the 43-ton heavy energy storage containers. Standard container vessel solutions were therefore entirely unworkable. Balancing transportation costs and operational convenience, multipurpose heavy-lift bulk carriers became the only viable option.Furthermore, oversize road permits for inland transportation in Japan were tied to designated discharge terminals, resulting in an extremely limited pool of compliant vessels that meet load capacity, berthing and schedule requirements, making vessel selection highly difficult.

Challenge 2: Full Berth Restrictions Trigger 3-Month Permit Renewal Risk

The originally scheduled terminal berth was closed temporarily for maintenance, only accommodating small vessels under 100 meters in length. Alternative berths were inaccessible for oversize cargo transport due to local road controls, and no other berths matched the dimensions of the planned carrier. The original berthing plan was fully invalidated. Switching to a different port would require reapplication for oversize road permits, with a review cycle of up to three months – a delay that would directly miss the client’s delivery deadline.

Challenge 3: Scarce Compliant Vessels Lead to Unstable Sailing Schedules

Direct bulk and general cargo liner services between China and Japan run infrequently with volatile schedules. Vessels that simultaneously feature built-in heavy lifting cranes, compatible hull dimensions, proven track records handling energy storage containers and perfectly aligned sailing schedules are extremely rare. Compounding this issue, Japanese bulk cargo terminals are relatively small, with low call frequencies for large heavy-lift vessels, pushing up the difficulty of vessel scheduling and negotiation.

Challenge 4: Strict Terminal Operation Windows at Destination Port Bring High Risk of Port Detention

Loading and unloading operations at the destination terminal are only permitted during daytime hours on workdays, with all handling suspended at night and on weekends. Bulk carriers face potential arrival delays caused by multiple variables including port rotation schedules, maritime weather, cargo load volumes and terminal dispatching. Missing the designated handling window would incur substantial port detention charges, creating immense pressure for punctual delivery.

Challenge 5: No Temporary Ground Storage Allowed for Hazardous Cargo at Destination Port – Zero Margin for Error in Vessel-Truck Coordination

Stringent regulations govern heavy energy storage containers at Japan’s bulk carrier berths. Owing to ground load-bearing limits that prohibit temporary on-terminal storage, a direct ship-to-truck discharge model was mandatory: containers had to be immediately hauled to off-terminal yards upon unloading. Continuous transfer of all 32 energy storage units demanded seamless, high-tempo coordination among the carrier, terminal operator, trucking provider, storage yard and crane team, with no room for operational misalignment.

Challenge 6: Divergent Customs Classification Standards Increase Compliance Declaration Complexity

Four Iterative Logistics Schemes Shift Operations from Risk Mitigation to End-to-End Control

Confronted with interlocking, multi-layered project constraints, Sungreen Logistics immediately activated its emergency response protocol. Led by the General Manager of the New Energy Division, a dedicated project task force was assembled, bringing together core specialists from sales, marketing, customer service, transportation and overseas branches. Combining project pain points with Japanese site conditions, regulatory policies and operational standards, the team iteratively modeled four full-process logistics solutions, refining each version repeatedly before finalizing the optimal execution roadmap – transforming the team’s approach from reactive risk response to proactive end-to-end oversight.

“Japan’s energy storage market is defined by extreme rigor and zero tolerance for errors; every potential risk must be anticipated in advance. Converting all uncontrollable variables into predictable operational procedures is the ultimate test of a freight forwarder’s comprehensive capabilities.”

Berth Solution Eliminates 3-Month Permit Renewal Timeline

After in-depth cross-party consultations and repeated load calculations with shipowners, Japanese terminals and the consignee, the task force secured Berths 6 and 7 at the roll-on/roll-off terminal as the final berthing location. Coordination confirmed the berths can accommodate 130-meter large heavy-lift bulk carriers, with ground load-bearing capacity fully compliant for discharging the 43-ton heavy energy storage containers, while retaining alignment with the original operational workflow. Most critically, the designated berths eliminated the need for road permit reapplication, safeguarding the committed delivery window.

Locked Custom Heavy-Lift Vessel with Custom Stowage to Minimize Risks

”The Project Manager added: “Bulk carrier shipments inherently carry inherent operational risks. The core purpose of designing customized logistics solutions is to shift from passive damage control to proactive risk containment by identifying hazards upfront – this is the core value we deliver as a logistics solution provider.”

Regulatory Pre-Validation Aligns with Japanese Customs Clearance Rules

The company’s compliance team conducted in-depth pre-shipment policy research and liaised with Japanese customs authorities to confirm official declaration standards, securing formal classification of energy storage containers as “container equipment”. The team immediately discarded the original SOC declaration framework, simultaneously optimizing manifest filings, discharge plans and customs documentation to fully eliminate compliance risks stemming from divergent regulatory definitions and enable smooth, efficient clearance.

Negotiated Extended Operation Windows to Resolve Time Restrictions

To address the terminal ban on night and weekend handling, the task force maintained continuous communication with shipowners, terminal operators and the Japanese consignee, successfully securing approval for extended daily handling hours on workdays. This created ample operational flexibility for vessel berthing and cargo loading/unloading, further mitigating risks of costly overtime detention.

End-to-End Rigorous Control: Every Step from Pickup at Taicang Port to Delivery in Nagoya, Japan

Cargo Receipt at Taicang Port: Itemized Inspection with Full Archiving

On June 11, all 32 energy storage containers arrived at the terminal ready for loading. Dedicated on-site supervisors oversaw receipt procedures, conducting item-by-item inspections covering exterior condition, container ID markings, lifting foot structures, door locking mechanisms and tarpaulin lashing. All inspection records were filed in hard copy with photographic evidence retained, ensuring full cargo condition control from the point of origin.

On the morning of June 14, fog lifted at Taicang Port, and tugboats guided the contracted vessel to its designated berth. Loading was carried out using ZPMC gantry cranes with a rated safe working load of 61 tons, fully meeting operational load requirements.

”The Project Manager emphasized: “We collaborated closely with the shipowner to finalize the container positioning framework and prepared comprehensive contingency plans for cargo securing. The resulting three-tier securing system – vertical bottom fastenings, horizontal cross-group locking at the top, and diagonal bracing at both vessel ends – effectively counteracts capsizing and sliding forces generated by the vessel’s rolling and pitching at sea.”

The on-site project manager supervised all loading operations in person. All 32 energy storage containers were stowed flat on deck, each secured with base twist locks, linked horizontally via bridge locks, and reinforced with full-length diagonal bracing at both vessel ends. This three-tier securing system fully complies with classification society regulations and UN3536 stowage standards.

With a resounding ship horn blast, the vessel set sail bound for Japan.

Discharge at Destination Port: Special Lifting Gear Air-Shipped In Advance for Seamless Direct Ship-to-Truck Transfer

Prior to the vessel’s arrival, Sungreen Logistics’ overseas team deployed on-site staff to complete pre-operation preparations at the destination terminal. Standard lifting gear onboard bulk carriers lacked sufficient strength for energy storage container discharge, so custom lifting equipment was airfreighted to the port in advance. Once fitted to the heavy-lift vessel, the lifting gear delivers a safe single-hook working load of 60 tons within an operating radius of 3.7 to 16.0 meters, fully capable of unloading the 43-ton energy storage containers – the key rationale behind selecting a heavy-lift carrier for this shipment.

The vessel anchored offshore on June 18. Sungreen Logistics’ overseas team coordinated with terminal operators and the carrier to arrange pilotage and berthing, completing terminal and maritime authority onboard inspections before releasing all container securing lashings. On June 19, cross-party field coordination strictly enforced the direct ship-to-truck discharge model: containers were transferred to specialized low-bed trucks immediately after lifting without any interim on-terminal storage, and hauled directly to off-port storage yards. The overseas team oversaw all discharge activities to guarantee smooth, safe delivery of every unit.

9-Day Efficient Delivery Sets New Benchmark for Large-Scale Energy Storage Projects

From container receipt at Taicang Terminal on June 11 to full delivery completion at the destination port, the entire cross-border logistics cycle was completed in only 9 days. A cross-border task force of nearly 20 team members coordinated across two countries to resolve successive hurdles including berth capacity constraints, vessel sourcing, restricted handling windows and hazardous cargo storage regulations, successfully fulfilling the 160 MWh large-scale energy storage transportation assignment.

”The Project Manager commented: “From the moment the vessel berthed for loading through every milestone upon arrival in Japan, our team maintained round-the-clock efficient coordination. This seamless delivery was not a stroke of luck – it was the result of our team resolving each challenge one by one.”

The successful delivery of this 160 MWh large-scale energy storage project marks the largest energy storage project delivered in Japan to date. The shipment not only delivered fully on client expectations but also established a replicable operational benchmark for exporting heavyweight energy storage containers from China to Japan.

Japan’s energy storage market is poised for sustained expansion, with mass exports of 6.25 MWh energy storage containers scheduled for Q3. Rising market demands for high-end specifications, standardized processes and ultra-stringent compliance will continue to raise industry entry barriers for cross-border energy storage logistics. Sungreen Logistics will deepen its focus on new energy international logistics, target core pain points of energy storage export shipments, continuously optimize its end-to-end hazardous goods logistics service system and refine the professional operational expertise of its team. Through faster delivery cycles, customized professional solutions and comprehensive risk management capabilities, the company will support more domestic Chinese energy storage brands to capture global market share and empower the worldwide expansion of China’s energy storage industry.