The Bay State Wind Offshore – Battery Energy Storage System is a 55,000kW energy storage project located in Massachusetts, US. The rated storage capacity of the project is 110,000kWh.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2018 and will be commissioned in 2021.


The Bay State Wind Offshore – Battery Energy Storage System is being developed by Eversource Energy, NEC Energy Solutions and Orsted. The project is owned by Eversource Energy (50%) and Orsted (50%).

The key applications of the project are renewables capacity firming and renewables energy time shift.

Contractors involved

Eversource Energy and Orsted are the owners. Eversource Energy, NEC Energy Solutions and Orsted are the developers. NEC Energy Solutions is the technology provider for the project.

Additional information

Bay State Wind is the owner & developer of the project. Bay State Wind is the 50-50 partnership between Orsted and Eversource, New England’s major transmission builder. According to an estimate, the energy storage project can help in saving about $158m per year, while enhancing grid stability by shifting energy delivery to meet demand profile. Bay State Wind has signed a letter of intent to work with NEC Energy Solutions to develop energy storage system for its 800 MW offshore wind farm.

About Eversource Energy

Eversource Energy (Eversource) is an energy holding company. The company distributes and transmits electricity and supplies natural gas and water. The company sources water from owned surface water reservoirs and groundwater wells and purchases water from other water suppliers. It procures electricity through short-term and spot purchases in the New England wholesale power market. Eversource also offers energy conservation and management solutions through interactive planning tools, energy saving tips, and energy usage information; and electric vehicle charging services. The company serves residential, commercial, industrial, municipal and fire protection and other customers in Connecticut, Massachusetts and New Hampshire. Eversource is headquartered in Springfield, Massachusetts, the US.

About NEC Energy Solutions

NEC Energy Solutions Inc (NEC Energy Solutions), a subsidiary of NEC Corp is a solar products company that manufactures and develops advanced batteries for backup power, electric grid, and lead-acid replacement applications. The company’s products include lead acid replacement batteries, component cells, and grid storage solutions. NEC Energy Solutions’ products find application in datacenter, medical, telecom, security systems, UPS systems, electric mobility, and other industrial applications. The company offers services such as operations and maintenance services, and grid integration and installation services. It provides its products through online resellers to customers in North America, EMEA, and the Asia-Pacific regions. NEC Energy Solutions is headquartered in Westborough, Massachusetts, the US.

About Orsted

Orsted AS (Orsted) is a renewable energy company. It develops, constructs, and operates offshore and onshore wind farms, bioenergy plants, solar farms, and energy storage facilities, and provides waste-to-energy solutions and smart energy products. The company produces heat and electricity using coal, natural gas, oil, biomass, wind and solar sources; and sells power and gas in wholesale and retail markets, and optimizes and hedges its energy portfolio. Orsted also owns and operates gas and power contracts, and originates and trades these for optimizing its portfolio; and operates Renescience plants, biogas upgrade facilities and biogas plants. It has operations in the UK, Denmark, Germany, the US, the Netherlands and other. Orsted is headquartered in Fredericia, Denmark.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.