Ogasawara-Hahajima (Hahajima means "Mother Island" in Japanese) is located about 50 km south of Chichijima (Chichijima means "Father Island" in Japanese), which is 1000 km south of central Tokyo. It is a quiet, green island with a subtropical tree forest. At the 35th session of the World Heritage Committee held in Paris in June 2011, it was evaluated as meeting the "Ecosystems" evaluation criteria for a World Natural Heritage Site, and on June 29 of the same year, it was registered as a World Natural Heritage Site.
As part of the Tokyo Metropolitan Government’s efforts to realize a zero-emission island and Ogasawara Village’s efforts to realize a sustainable island in harmony with nature, Tokyo Metropolitan Government, Ogasawara Village, and TEPCO Power Grid have concluded an agreement, and the three parties are working together to implement the project. This demonstration aims to establish a power supply technology with 100% renewable energy and off-grid technology.
The system will basically consist of a combination of photovoltaic power generation sites and a battery energy storage system to supply 100% renewable energy. During the day, electricity will be supplied by photovoltaic power generation sites, and excess electricity will be used to charge a battery storage system. When there is a shortage of solar power generation, such as at night or in bad weather, electricity will be supplied via discharge from the battery storage system. If the battery charge is exhausted, diesel generators will supply backup power.
In this demonstration, solar power generation facilities, storage batteries combined with a new power conditioning system (PCS), and an integrated energy management system (EMS) to manage the entire distribution system will be newly installed in the existing distribution system. The following technological elements are necessary. They have been researched and developed in order to realize a 100% renewable energy power supply.
By incorporating these technological elements into existing distribution systems and establishing verification technologies, we aim to further expand the introduction of renewable energy and become an electricity transmission and distribution company that contributes to a sustainable society.
The United States Air Force (USAF) will celebrate the completion of a new microgrid on Saturday when officials host a ribbon-cutting ceremony at Yokota Air Base in Japan.
The base''s new 10.72-MW combined heat and power (CHP) microgrid is part of a $406 million infrastructure improvement project that also includes energy and water saving efforts. The completed project will modernize the energy resilience and security of the base, which is located roughly 30 miles outside of Tokyo and is a critical part of the U.S. military''s operations in the Pacific.
Schneider Electric began construction on the project in 2021.
The microgrid is capable of powering the entire base during an outage, enabling Yokota to disconnect, or island, from the utility grid with no impact on base operations. During normal operations, the microgrid''s controller allows the base to optimize its energy use, lowering costs and reducing emissions.
The Yokota Air Base project joins a growing list of U.S. military bases with microgrid installations, including Marine Corps Air Station Miramar, White Sands Missile Range and Kirtland Air Force Base.
"We are proud to partner with the U.S. Air Force in their efforts to enhance mission readiness through energy assurance, working alongside the Yokota Air Base team to implement new technologies and system upgrades that will dramatically improve efficiency, resiliency and environmental responsibility," said Annette Clayton, CEO of Schneider Electric North America.
The microgrid was developed and implemented by Schneider Electric under a 25-year self-funding energy savings performance contract (ESPC), which required no upfront investment from the base or American taxpayers. The energy savings provided by the new system will cover the cost of the contract over its life cycle.
It is expected that the CHP-driven microgrid will save the base $12.3 million a year and reduce carbon dioxide emissions by 33,000 metric tons annually, according to a release from Schneider Electric.
The US military is increasingly using ESPCs to develop microgrids in support of its energy resilience goals.
"ESPCs solve several challenges for our military: They make defense facilities more resilient to outages and secure from threats, while also helping to improve efficiency — all through a coordinated set of solutions," said James Potach, senior vice president of energy and sustainability services at Schneider Electric.
In addition to the new CHP plant and Schneider''s EcoStruxure microgrid controls and software, other system and building upgrades were made on the base as a part of the project.
Yokota''s energy management control system was upgraded to optimize mechanical, electrical and building systems across the base.
Additionally, more than 450 buildings were upgraded to reduce energy consumption by 75 million kWh per year and water consumption by 30 million gallons per year. Energy efficient LED lighting was installed across the base in addition to water conservation systems.
These efforts are expected to reduce the base''s annual energy and water costs by nearly 30%, according to Schneider Electric.
"The Yokota Air Base project is a great example of how to leverage traditional conservation measures in an ESPC and generate savings to fund resilience gaps identified in the Air Force governance process. This fence-to-fence holistic approach bundles lower payback opportunities with higher cost resilience requirements for critical missions to maximize the benefit for the installation," said Mike Ringenberg, United States Department of the Air Force, ESPC/UESC SME and program manager.
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I work as a writer and special projects editor for Microgrid Knowledge. I have over 30 years of writing experience, working with a variety of companies in the renewable energy, electric vehicle and utility sector, as well as those in the entertainment, education, and financial industries. I have a BFA in Media Arts from the University of Arizona and a MBA from the University of Denver.
A tiny, coral reef-surrounded island in southern Japan will be able to use renewable energy as its main source of power, thanks to a microgrid with battery storage technology at its heart.
Technology company Kyocera has entered a partnership agreement to build the microgrid with municipal governments of China-cho and Wadomari-cho, which are the two towns on Okinoerabujima, an island less than 100km2 in area and with a population of about 12,000 people.
The island, about 2,000km south of Tokyo, has a subtropical climate and is prone to typhoons, which cause frequent power outages. Both of its towns are reliant on imported diesel for electricity and in addition to the logistical difficulties and costs of bringing the fuel in, keep the region locked into a cycle of high greenhouse gas emissions.
Kyocera''s project is being supported by subsidies from the central government of Japan''s Ministry of Economy, Trade and Industry (METI) for promoting local cooperation through the use of renewable energy.
It will combine solar PV, wind turbines, battery energy storage and an energy management system (EMS) to balance supply and demand. No new power lines will be required, said Kyocera, which itself makes key equipment of the type that will be used, including battery storage and solar PV modules.
Kyocera told Energy-Storage.news that the sizing of the system or its components have not yet been determined for the project, which is at an early stage. Feasibility studies are underway and plans are expected to be created by March next year, with construction activities including installation of solar, batteries and EMS equipment to begin in April.
The company did say that the scale of electricity demand on the island is more than 10MW, and that "tens of megawatts" of solar power, wind, and "tens of megawatt-hours of storage batteries and electric vehicles are needed to decarbonise this island".
"Details of this entire system are being discussed," Kyocera said.
The company plans to build a small-scale microgrid system centred on public facilities, which have several hundred kilowatts demand. The microgrid will have "hundreds of kilowatts of solar power and hundreds of kilowatt-hours of battery storage," the company said.
As well as managing and integrating power from variable solar and wind sources, the microgrid will give the region resilient power during emergencies and natural disasters. Under the project agreement, Kyocera and China-cho and Wadomari-cho will create a local power company to maintain the facilities.
China-cho declared a climate emergency in September 2020, joining a handful of other Japanese local authorities to do so since the government of Nagano Prefecture in the north of the main Japanese island of Honshu was the first in 2019.
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