Mars Hill is a 42MW onshore wind power project. It is located in Maine, the US. The project is currently active. It has been developed in single phase. Post completion of construction, the project got commissioned in March 2007.

Project Type Total Capacity (MW) Active Capacity (MW) Pipeline Capacity (MW) Project Status Project Location Project Developer
Onshore 42 42 Active Maine, the US First Wind Holdings; James W. Sewall


The project was developed by First Wind Holdings and James W. Sewall. JPMorgan Chase and TerraForm Power are currently owning the project.

The project generates 127,000MWh electricity and supplies enough clean energy to power 18,000 households, offsetting 47,900t of carbon dioxide emissions (CO2) a year. The project cost is $82.95m.

Development Status

The project is currently active. The project got commissioned in March 2007.

Power Purchase Agreement

The power generated from the project is sold to New Brunswick Power under a power purchase agreement.

Contractors Involved

Reed & Reed was selected to render EPC services for the wind power project.

GE Renewable Energy was selected as the turbine supplier for the wind power project. The company provided 28 units of 1.5sle turbines, each with 1.5MW nameplate capacity.

About James W. Sewall

James W. Sewall Co (Sewall) is an energy consulting company. It offers engineering, geo-spatial and forestry consulting services. The company provides service such as utilities infrastructure mapping and asset management, structural and traffic engineering, surveying, aerial photography and photogrammetric mapping, forest management and management planning. It also offers natural resource mapping, geospatial data acquisition and development, GIS services, web services, remote sensing, among others. Sewall caters solutions for government agencies, oil and gas, electricity, telecommunication, traffic and transportation, water and wastewater utilities, biomass, climate and weather, retail and commercial, and NGOs. The company operates through its regional offices located in Minnesota, Florida, Vermont, Georgia and South Carolina, the US. Sewall is headquartered in Old Town, Maine, the US.


All power projects included in this report are drawn from GlobalData’s Power Intelligence Center. The information regarding the project parameters is sourced through secondary information sources such as electric utilities, equipment manufacturers, developers, project proponent’s – news, deals and financial reporting, regulatory body, associations, government planning reports and publications. Wherever needed the information is further validated through primary from various stakeholders across the power value chain and professionals from leading players within the power sector.