The legacy Yokohama entry is Tokyo Gas's roughly 100 kW-class holonic energy-system research microgrid at its Yokohama Research Institute, commissioned for testing in 2006. It combined inverter-interfaced natural-gas and biogas cogeneration, solar, wind, two battery chemistries, a UPS and thermal equipment, and could transfer from grid-connected operation to an island supplied by a grid-forming 25 kW gas engine plus batteries. It is distinct from the much larger Yokohama Smart City Project. Tokyo Gas later began a separate virtual-power-plant demonstration at the same institute in 2020, using 50 kW of on-site PV and a 100 kW/255 kWh battery while coordinating remote generation through self-wheeling.
- Research status
- The original laboratory configuration is a historical R&D installation: construction/testing began in September-October 2006, and published trials document grid-connected power balancing and intentional islanding. Tokyo Gas still lists the Yokohama site, now called Yokohama Techno Station, as an active R&D base. A successor VPP demonstration began operation there in January 2020, but no public evidence found in this review confirms that all 2006 generators, batteries and thermal plant remain installed or provides post-2020 operating results. The original microgrid should therefore be classified as historically commissioned/tested, with current configuration and performance unverified.
- Historical classification
- CHP
- Reported capacity
- 100 kW
- Coordinates
- 35.44087, 139.63322
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