Smart Grid News and Analysis

IoT World Forum 2018
IoT World Forum 2018

Siemens Rolls Out Smart Grid Remote Terminal Units for Decentralized Energy Resources


With the Sicam SGU, Siemens’ Smart Grid Division has launched a communications-capable field device on the market. The unit can be used to connect distributed energy resources to a grid control or energy management system by means of communications technology. Used as an input/output (I/O) unit, Sicam SGU allows power companies and public utilities to control and monitor decentralized power generation facilities and power consumers via the smart grid remote terminal unit. In particular, it can be used for bundling decentralized energy sources into a virtual power plant, for demand-response applications, and for setting up micro-grids.

Balancing out power generation and power consumption at all times is a bigger challenge for the control system in smart grids, with their many renewable energy sources and controllable loads, than in conventional grids. To meet this challenge, the system requires communications-capable I/O units such as the Sicam SGU to control and monitor the field level. To communicate with a control system such as Spectrum Power or the DEMS energy management system developed by Siemens, the field device uses an integrated mobile communications module or an Ethernet connection. Decentralized power generation facilities or power consumers can then be controlled via the device’s six I/O ports.

The integrated GPRS mobile communications card is also a cost-effective alternative to a fiber optic connection or to a separate external modem. Equipped with this card, Sicam SGU is able to connect distributed, renewable energy sources to control and energy management systems of all types. For example, the remote terminal unit can be used as a decentralized energy resources (DER) controller for virtual power plants in order to communicate with the energy management system. The Sicam SGU is also suited for integrating renewable energy sources in micro-grids. As a compact remote terminal unit, Sicam SGU enables the implementation of applications for energy flow control or data collection in local and distributed networks. In both cases, the IEC 60870-5-104 communications protocol is used for communication. When the Sicam SGU is utilized as a field device for demand-response management systems, it uses the interoperable, data-protected OpenADR (Automated Demand Response) communications protocol.

Siemens ensures that the required data privacy is maintained for all applications of its new remote terminal unit. A connection to a closed VPN (Virtual Private Network) based on IPsec (Internet Protocol Security) enables encrypted data transmission. When used without a mobile communications module, TLS (an integrated encryption protocol for secure data transmission via the Internet) establishes end-to-end data security for the OpenADR communications.

Energy-efficient, eco-friendly solutions for setting up intelligent power supply networks (Smart Grids) and the associated service are part of Siemens’ Environmental Portfolio. Around 43 percent of its total revenue stems from green products and solutions. That makes Siemens one of the world’s leading providers of eco-friendly technology.

The Siemens Infrastructure & Cities Sector (Munich, Germany), with approximately 90,000 employees, focuses on sustainable and intelligent infrastructure technologies. Its offering includes products, systems and solutions for intelligent traffic management, rail-bound transportation, smart grids, power distribution, energy efficient buildings, and safety and security. The Sector comprises the divisions Building Technologies, Low and Medium Voltage, Mobility and Logistics, Rail Systems and Smart Grid. For more information please visit

The Siemens Smart Grid Division (Nuremberg, Germany) offers power providers, network operators, industrial enterprises and cities an end-to-end portfolio with products and solutions to develop intelligent energy networks. Smart Grids enable a bidirectional flow of energy and information. They are required for the integration of more renewable energy sources in the network. In addition, power providers can run their plants more efficiently with data gained from Smart Grids. Software solutions that analyze data from Smart Grids will continuously gain importance. Thereby, the division uses in-house developments in addition to systems from software partners. For further information please see: