A 110-foot-long lift vessel will periodically be located off the shore of Camp Pendleton in Virginia Beach, Va., during July to obtain core samples needed for Dominion Virginia Power to move ahead with its proposal to build wind turbines 27 miles off the coast.
According to Dominion, the U.S.-flagged Inez Eymard literally lifts itself out of the water to provide a stable platform for collecting the core samples. As weather permits, the vessel will conduct borings off Camp Pendleton during the month. The vessel's location will range from 300 to 3,300 feet from the shoreline while it collects data for the design of the underground electric distribution line.
The Inez Eymard, which usually works in the Gulf of Mexico, has spent the past few days working at both Camp Pendleton and at the turbine site 27 miles off the coast of Virginia Beach.
Dominion has received two Department of Energy grants totaling $51 million for its wind turbine demonstration project. If the project is approved, the company plans to build two 6 MW turbines and test design features intended to lower the cost of construction, reduce maintenance and withstand hurricane-force winds.
The company intends to use lessons learned from the demonstration turbines to guide the development of up to 2 GW of wind energy. Dominion also holds the lease on 112,800 acres of commercial wind area adjacent to the demonstration project.
To develop the demonstration project, Dominion is working with a team of national and international organizations recognized for their offshore expertise. The team includes Alstom Power; engineering, construction and services firm KBR; and the Commonwealth of Virginia Department of Mines, Minerals and Energy, which will hold the lease on the demonstration site.
The four borings at the turbine site will be collected approximately 330 feet below the ocean floor. The samples will be used to determine soil characteristics such as composition and strength to finalize the design of the wind turbine foundations.
Near shore, the vessel has finished two borings and has nine more to complete. The samples will be used to finalize the installation plan of the underground distribution line that will run from the turbines to Camp Pendleton, where they will be connected to Dominion's electrical grid. Each of these borings will be obtained approximately 80 feet below the ocean floor.
Dominion still needs to obtain several regulatory approvals. Based on approval by mid-2016, major construction would occur in 2017, and the wind turbines would begin operating later that year.