California Rule 21 Solutions

Electric Rule 21 interconnection by the California Public Utilities Commission mandates the interconnection standards for a select set of renewable generators. These interconnection requirements would require Inverters to support IEEE 2030.5 and need to connect to Utility SCADA Systems directly or through an Aggregator initially for monitoring purposes and later for control as well. The requirements also mandate compliance to cyber security requirements as specified by the SIWG and in the CSIP.

ASE has combined its over 35 years of expertise in working with utilities and OEM’s to design a secure and cost effective solution to meet these interconnection standards. Further ASE has partnered with its parent company Kalkitech and its Energy IoT Division to provide a comprehensive solution for Rule 21 that addresses the data collection, protocol and security at the Edge as well as data collection and integration at the Utility or Aggregator level as well.

Our IEEE 2030.5 Aggregator Client, KALKI.IO Device Management & Head End and Intel ODM Partnerships enable Inverter manufacturers, Utilities, Developers and System Integrators a comprehensive set of tools, software and hardware to be compliant and lead the pack in CA Rule 21 projects.

  • IEEE 2030.5 Gateway Edge Software that supports Modbus, DNP3, IEC 61850, DLMS and IEEE 2030.5 with X.509 support and Cyber security support
  • Edge Hardware that supports Modbus, DNP3, IEC 61850, DLMS and IEEE 2030.5 with X.509 support and cyber security support. The hardware also comes with Digital I/O and Analog I/O to monitor hardwired inputs or take control action.
  • Aggregator Software that support IEEE 2030.5 Server and Client, in addition to DNP3, SunSpec Modbus, IEC 61850, DLMS etc., that can  integrate with the renewable generators, batteries etc., as well as Utility SCADA Systems over IEEE 2030.5 or other Utility SCADA Protocols
  • Remote device management with monitoring & control dashboards for managing and maintaining the renewable generators and storage.
SyncConnect IEEE 2030.5

IEEE 2030.5 Aggregator Client Architecture

Data Collection

  • Real-time and historic data acquisition
  • Proven Interoperability with sensors, controllers, measurement devices and protection relays
  • A large library of protocol support for standard and legacy protocols


  • TLS 1.2 based communication security
  • Secure role-based access control using x.509 PKI standard

Data Processing

  • Real time streaming and data processing
  • User configurable data processing
  • Event handling, and time-based data
  • ML and AI integration


  • Large deployment, monitoring and management support
  • Scales with large number of devices and data
  • Scales with edge device resources
  • Containerized services

Data Storage

  • Store data periodically or on event basis
  • Time series database for optimal performance
  • Database management options


  • Remote configuration and settings
  • Over the air firmware and patches updates

Data Distribution

  • Amazon AWS
  • Azure
  • MQTT
  • OPC UA
  • Google Cloud


  • Deployable on your hardware and OS
  • Peer-to-peer data transfer capability
  • Choose best of bread hardware suitable for your application
  • Integrate with local/remote SCADA systems as well as cloud platforms


IEEE 2030.5 Aggregator Client Edge Gateway Software SyncConnect have ready made templates to connect with standard inverters available in market and also support for standard protocols such as IEEE2030.5, SunSpec Modbus, DNP3 and IEC61850-90-7 which helps user to integrate any inverters, string combiners, weather sensors, battery controllers or meters seamlessly. It also supports commonly used utility protocols like IEC-60870, DNP3.0, DLMS-COSEM to connect with grid operator. SyncConnect enables secure connectivity with each device remotely for configuration and maintenance purpose. SyncConnect runs in any standard Linux OS based hardware/ Virtual Machines/ Containers.

IEEE 2030.5 Client Gateway can be deployed within an Inverter, in a Controller or as a standalone gateway using any off-the shelf hardware. With support for X.509 certificate, strong NERC/CIP compliance configuration support, support for TPM and TLS 1.2 this is ideal for faster go to market. Given the support for IEEE 1547, IEEE 2030.5 and IEC protocols and security requirements together with integration capability with multiple devices, SyncConnect is ideal for building a single unit that can be deployed not just for the Rule 21 market but world-wide. More information on SyncConnect Gateway Software is available here



SYNC200 Embedded Protocol Module

SYNC200 embedded protocol gateway boards with support for 40+ protocols including IEEE 2030.5, DNP3, SunSpec Modbus, IEC61850 with many to many conversion engine is ideal for supporting California Rule 21 and IEEE 2030.5 Aggregator Client to your Inverters and Storage Controllers.

With support for Cloud Connectivity to Azure, AWS and IBM Cloud IoT infrastructure and generic MQTT support and support for device management framework, SYNC200 is the ideal embedded module for DER interconnections. SYNC200 supports X.509 certificate and TLS1.2 and can be configured to be compliant with NERC/CIP.


SYNC2101 IoT Controller

SYNC2101 is a compact, rugged and secure hardware that supports IEEE 2030.5, SunSpec Modbus, DNP3 and IEC 61850. It supports native Digital I/O and Analog Inputs with a comprehensive Logic Programming Engine based on IEC 61131. The SYNC 2101 controller can be used to communicate directly with Utility SCADA or head-end over native TLS 1.2 connections or over DNP3 both for monitoring and also to do control action.

With support for Cloud Connectivity to Azure, AWS and IBM Cloud IoT infrastructure and generic MQTT support and support for device management framework, SYNC200 is the ideal embedded module for DER interconnections. SYNC2101 supports X.509 certificate and TLS1.2 and can be configured to be compliant with NERC/CIP.


Rule 21 Aggregator software based on is a scalable SaaS / Cloud solution that supports IEEE 2030.5 Server and Client as well as OpenADR. Further it supports SCADA / Utility protocols like DNP3, ICCP and OPC UA and REST/JSON API’s.  The Aggregator will act as a Cloud Gateway for IEEE 2030.5 or DNP3 or Modbus devices enabling many to many protocol conversion and data aggregation. Depending on the agreement between the Utility and Aggregator or the Renewable Developer the Aggregator software can be configured to the appropriate protocol or interface.

With strong PKI and X.509 infrastructure in aggregator platform customers can install and integrate their own specific PKI system to Support for SunSpect mandated PKI system is easily possible.

Aggregator provides remote monitoring and management of solar generation plants and its associated components by securely connecting with inverters, weather stations, irradiance sensors, revenue meters and batteries as required for the deployment.


Supports multiple makes of inverters and revenue meters

Edge Storage and analytics to mitigate internet/ communication loss

User friendly interface with single line diagram, dashboards, report & alerts

REST API for building additional applications


Rule 21 implementation will result in a large number of small solar generators getting connected to the Utility Grid and communicating to the utility directly or through an Integrator. It is humanly impossible to manage, maintain and keep up to date these systems. Further cyber security audit and analysis of these systems also need to be done routinely.

Our Device Access Pack provides remote configuration and management access for field devices by securely extending the connectivity between device’s programming port and engineering tool over a public/private network. Device Access pack also can be used to acquire data from a device over a wide number of utility, industry and IOT protocols supported.


Secure on demand connection between device and a remote workstation for device configuration and troubleshooting acquire data from devices over 100+ industrial and utility specific protocols

Role based access control on device data and configuration access