OES Going Open Source
Autonomous Power Interchange System(APIS)

GitHub link here


Global environmental changes are increasing in severity, and there is even discussion of Climate Departure, which means an irreversible climate transition [1]. Furthermore, the spread of the new coronavirus from the end of 2019 has become a pandemic, with many countries going into a long-term lockdown, and economic activities have been greatly restricted. However, even with these restrictions on economic activities, the effect on climate change is very limited and there is a widespread recognition that qualitative changes are essential, rather than mere quantitative controls, in the industrial structure, especially in the structure of energy supply and demand[2, 3, 4]

Sony CSL have been researching and developing the microgrid, a power system that is decentralized, scalable, and moreover resilient to disasters. A microgrid utilizes decentralized, renewable energy sources, including solar and others, to generate, store and distribute power for use by a specific area while reducing greenhouse gas emissions. In addition, this is a highly resilient power system that is decentralized and autonomous, minimizing the distance over which power must be distributed and the impact of physical damage wrought by natural disasters. In order to maximize the benefits of the microgrid, Open Energy System (OES) has established a series of technology systems centered on direct current (DC) physical peer-to-peer (P2P) autonomous power integration technology, and has been conducting demonstration research at the Okinawa Institute of Science and Technology (OIST). The demonstration research at OIST was completed in March 2020, and based on the results of five years of stable operation, it was judged that the system was reaching a practical level.

At the same time, the fact that it is difficult to control climate change, even by limiting economic activities due to this pandemic, led us to the conclusion that this technology should be made available in open source form to accelerate its diffusion. On December 1, 2020, Sony CSL made its Autonomous Power Interchange System (APIS) -  the power interchange management software they develop, as open source. (Press Release)

Creating a Sustainable Power System

OES was developed as a  microgrids that will increase the adoption of renewable energy, and that are highly scalable and highly resilient to disaster. At its core, it is an autonomous power sharing system which allows distributed power systems to be interconnected and automatically adjust the power balance through IoT control.

What technologies did Sony CSL open-source?

The software that Sony CSL have now made open source has two important abilities.

The first is that it allows you to emulate the power interchange of a microgrid on your PC. If you are considering the adoption of microgrid technology, by using this software you can perform operation verification of power interchange under various parameters.

The second is the ability to control the actual battery systems that make up a microgrid. By setting up the software with the device drivers for each battery system, you can build a flexible microgrid with actual batteries that offers the following features.

  • Increased Resilience
    Each unit has its own battery system, and can operate independently
  • Increased Adoption of Renewable Energy
    Power distribution to each unit’s battery is regulated automatically, maximizing renewable energy generated within the microgrid, and minimizing power purchased from external sources
  • Microgrids: Easy to Build & Easy to Scale
    No limit to the scale of battery system you can connect, and units can easily be added to the grid later

Also, we plan to offer technical support to the people using this software.

Constituent Technologies

●Physical Peer-to-Peer (PP2P) Power Interchange

Achieves fixed quantities of power interchange between batteries through constant current control. Sends only the necessary amount of power according to certain rule. Allows fixed quantities of power interchange between specific users (batteries), which was difficult using voltage control, making it possible to perform PP2P power interchange: the trading of needed quantities and monetary amounts of power between users.

●Autonomous, Decentralized & Coordinated Control

Software with the same functionality is installed in each battery, and then this software determines power interchange between each battery system in accordance with agreed upon terms of trade (time slot, quantity, price, etc.). A flexible power trading system where you are free to set the power interchange terms for each battery, and to change those terms on the fly for each time slot.


In 2020, economic activity was significantly slowed to prevent the spread of COVID-19, but the resulting reduction in greenhouse gas emissions will be temporary [2, 3, 4]. If countries are to achieve carbon neutrality, further radical and continuing reductions of greenhouse gas emissions will be required. Sony CSL aims to contribute to the development of a sustainable society by offering technologies and creative environments for various stakeholders to come together and address the issues facing global society.

[1] Mora, C., Frazier, A. G., Longman, R. J. et al., “The projected timing of climate departure from recent variability,” Nature, 502, 183-187, 2013.

[2] Quéré, C. L., Jackson, R. B., Jones, M. W. et al., “Temporary reduction in daily global CO2 emissions during the COVID-19 forced confinement,” Nature Climate Change, vol. 10, 647-653, Jul. 2020.

[3] Forster, P.M., Forster, H.I., Evans, M.J. et al., “Current and future global climate impacts resulting from COVID-19, ” Nature Climate Change, vol. 10, 913–919, Aug. 2020.

[4] “Coronavirus: Green recovery ‘could prevent 0.3C’ of warming by 2050”

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