{"id":16621,"date":"2026-11-12T09:00:20","date_gmt":"2026-11-12T00:00:20","guid":{"rendered":"https:\/\/www.rts-pv.com\/en\/?post_type=blogs&p=16621"},"modified":"2026-11-11T12:24:46","modified_gmt":"2026-11-11T03:24:46","slug":"cybersecurity-for-solar-pv-and-battery-storage-japan-strengthens-grid-connection-requirements-from-2027","status":"publish","type":"blogs","link":"https:\/\/www.rts-pv.com\/en\/blogs\/16621\/","title":{"rendered":"Cybersecurity for Solar PV and Battery Storage: Japan Strengthens Grid Connection Requirements from 2027"},"content":{"rendered":"
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Japan Solar Update: No.226 (Nov 9 ~ 13, 2026)<\/h6>\n<\/div>\n
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Remote monitoring has become an important part of solar photovoltaic (PV) plant operation and maintenance (O&M), enabling operators to track power generation, identify faults, and manage equipment remotely. However, as renewable energy facilities become increasingly connected, the communication networks and IoT devices supporting these services can also become targets for cyberattacks. Recent industry initiatives and Japan\u2019s forthcoming grid connection requirements highlight the growing importance of cybersecurity in the renewable energy sector.<\/p>\n

Strengthening Security for Solar PV Remote Monitoring<\/h2>\n

On September 7, 2026, Tess Engineering and NTT DOCOMO BUSINESS announced an initiative to strengthen the security of communication infrastructure used for remote monitoring of solar PV installations.<\/p>\n

Tess Engineering provides services spanning solar PV system design and construction, 24-hour remote monitoring, and O&M. The company reported that a communication line provided by a customer had experienced a cyberattack that caused a significant increase in data traffic. This incident highlighted the need to protect not only the power generation equipment itself, but also the communication infrastructure supporting remote monitoring.<\/p>\n

The initiative uses docomo business SIGN\u00ae<\/em>, an IoT-oriented Network as a Service (NaaS) platform provided by NTT DOCOMO BUSINESS. The platform incorporates network-level threat detection and response functions. When suspicious communications are detected, monitoring personnel can be notified, and communications can be blocked remotely at the SIM level when necessary. The service also provides communication logs and data-usage visibility to support investigation and operational management.<\/p>\n

Tess Engineering is conducting initial operation and verification at solar PV plants it owns and operates. The companies aim to improve the security of remote monitoring by addressing risks associated with IoT routers and communication networks. Tess Engineering also plans to explore services that cover communication lines, network equipment configuration, and ongoing operation and maintenance.<\/p>\n

This initiative illustrates an important aspect of solar PV cybersecurity: protecting the monitoring network is a separate but complementary task to securing the control equipment installed at a power plant.<\/p>\n

Japan to Introduce JC-STAR Requirements for Grid-Connected Equipment<\/h2>\n

Alongside these industry initiatives, Japan is strengthening cybersecurity requirements for distributed energy resources connected to the electricity grid.<\/p>\n

The government is moving to incorporate the use of products certified under JC-STAR (Japan Cyber-Security Technical Assessment Requirements), Japan\u2019s IoT product security conformity assessment and labeling scheme, into grid connection technical requirements. Under the policy direction established through grid code discussions, relevant communication-enabled control equipment used in new grid-connected solar PV and battery storage systems will be required to obtain the JC-STAR \u26051 label or higher.<\/p>\n

The requirements are scheduled to apply to grid connection contract applications received from April 2027 for high-voltage and extra-high-voltage installations. For low-voltage installations below 50 kW, a transitional period is provided, with application from October 2027. The applicable date is linked to the grid connection contract application process, rather than the date on which the facility begins commercial operation.<\/p>\n

The scope focuses on equipment that uses Internet Protocol (IP) communications and has relevant monitoring or control functions. Depending on the system configuration, this may include power conditioning systems (PCS), energy management systems (EMS), output control devices, remote monitoring equipment, and communication gateways. Battery management systems (BMS) may also be relevant where they form part of an IP-based control system.<\/p>\n

Equipment that uses only serial communication and has no function for direct IP communication is generally outside the requirement. Equipment that supports both serial and IP communication, however, is covered. The requirement does not mean that every component in a solar PV or battery storage installation must be certified, nor does it require the wholesale replacement of all equipment at existing facilities.<\/p>\n

JC-STAR \u26051 establishes a baseline level of cybersecurity for eligible IoT products. Its use in grid connection requirements represents a shift toward making product-level security a formal consideration in equipment selection and project planning.<\/p>\n

Implications for Battery Storage and Other Renewable Energy Technologies<\/h2>\n

Cybersecurity is becoming increasingly important beyond solar PV. Battery energy storage systems (BESS), wind power, fuel cells, virtual power plants (VPPs), and microgrids all rely to varying degrees on communication and control technologies.<\/p>\n

Japan\u2019s policy discussions have also addressed the use of JC-STAR \u26051-certified products for grid connection of battery storage, wind power, and fuel cell systems. Further consideration is being given to higher security levels, including \u26052 and above, taking into account the specific threats and technical requirements associated with distributed energy resources.<\/p>\n

As more distributed resources are connected and coordinated through digital platforms, security risks may extend beyond individual devices to communication pathways, remote access, and interfaces between equipment and external systems. A certified product is an important starting point, but it does not by itself guarantee the cybersecurity of an entire power plant or energy management system.<\/p>\n

For operators, developers, and equipment suppliers, cybersecurity therefore needs to be considered throughout the project lifecycle, from equipment procurement and system design to network configuration, monitoring, incident response, and long-term O&M.<\/p>\n

Cybersecurity as Part of Reliable Renewable Energy Operation<\/h2>\n

The initiative by Tess Engineering and NTT DOCOMO BUSINESS demonstrates how network-level threat detection and response can help protect the communication infrastructure used for solar PV remote monitoring. Meanwhile, Japan\u2019s planned JC-STAR requirements address the baseline security of relevant communication-enabled equipment used in grid connections.<\/p>\n

These approaches address different layers of cybersecurity but share a common objective: supporting the safe and reliable operation of increasingly digitalized energy infrastructure.<\/p>\n

As renewable energy deployment and battery storage continue to expand, cybersecurity will become an increasingly important consideration alongside generation performance, cost, and maintainability. Protecting both the equipment and the networks that connect it will be essential to sustaining reliable renewable energy operations.<\/p>\n

\uff0aIPA: JC-STAR Certified Product List<\/a><\/h2>\n<\/div>\n","protected":false},"featured_media":16683,"template":"","blogs_category":[44],"class_list":["post-16621","blogs","type-blogs","status-publish","has-post-thumbnail","hentry","blogs_category-regulations-government-initiatives"],"acf":[],"yoast_head":"\nCybersecurity for Solar PV and Battery Storage: Japan Strengthens Grid Connection Requirements from 2027 | RTS Corporation<\/title>\n<meta name=\"description\" content=\"Based upon over 40 years of our experiences and accumulated knowledge in PV,RTS Corporation has been providing in RTS Corporation is a leading PV industry \/ market consultingcompany and has been supporting the growth of the PV industry for nearly 40 years.We provide an optimal consulting service for each client interested in the PV business.\u3000Weekly PV news is available at RTS PV Blog.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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