As general contractor, Hawaiian Dredging has been in charge of hiring related subcontractors and has been working on site since May 2008. The plant was designed by Chicago- based engineering and energy business consulting firm Sargent & Lundy, the turbine was provided by Siemens Corporation, the electrical contractor was American Electric, and Heide- Cook did the mechanical and plumbing work. In total there were 80 boilermakers, 45 electricians and a variety of masons and general laborers on site for the duration of the construction. Hawaiian Dredging self- performed more than 70 percent of the work, including two buildings about 40 feet high, two fuel tanks 60 feet high, three water tanks 60 feet high, and an exhaust stack 210 feet high. " We used a Triple 9 crane as our primary crane on this job," says secondary project manager Corey Saget. " We had two of these cranes on site for a critical tandem lift, which was slightly unusual, and it went smoothly." The cost of the generating unit is $ 164 million, including the associated transmission and substation improvements, such as an additional 138- kilovolt transmission line about two miles long adjacent to Campbell Industrial Park necessary to connect the new unit to the power grid more reliably, as well as the existing ones in the park operated by Hawaiian Electric. Hawaiian Dredging has also constructed infrastructure for a future combined- cycle turbine, to be added when it's deemed necessary to support the forecasted increasing demand for power. The regulatory commission approved an agreement between Hawaiian Electric and the Division of Consumer Advocacy ( as an agency of the state's Department of Commerce, the Division of Consumer Advocacy protects and advances the interests of Hawaii's consumers of regulated public utilities) that, after testing and certification, the new plant will be fueled 100 percent by renewable biofuel ( such as ethanol, a preferred clean fuel with very low emissions). After a competitive bidding process, Hawaiian Electric selected Imperium Services, LLC ( an affiliate of Imperium Renewables Hawaii), to supply biodiesel to drive the generating unit through 2011. Imperium has agreed to preferentially purchase sustainably grown Hawaii feedstocks, where available, for its planned Oahu biodiesel Hawaiian Dredging Construction for a few hours, due in part to the demand for electricity exceeding the supply on hand. With the completion of a new generating unit going online this summer, that type of blackout should be a thing of the past. On its Barbers Point Tank Farm site in Campbell Industrial Park on the island of Oahu, Hawaiian Electric Company has just constructed a 110- megawatt, simple- cycle peaking unit consisting of a combustion turbine generator and auxiliary systems to improve its electrical generation and transmission infrastructure. The industrial park itself is the largest in the state, a few square miles in size, on a southwestern coastal section of Oahu that used to be owned by the James Campbell Estates. It's a good location for an industrial park because the trade winds blow out to the sea, carrying any industrial odors with them, away from residential properties. The new generating plant was built by Hawaiian Dredging Construction, one of the oldest contracting firms in the state, founded in 1902. Industrial construction is just one of its specialties, which include high- rise and commercial buildings, heavy civil highway and bridge construction, waterfront installments and resort properties. " We've had a long relationship with local companies and utilities," says Hawaiian Dredging's senior project manager for the generating plant, Tom Valentine, who has worked for the company for nearly 20 years. " We've built most of the structure and infrastructure for Hawaiian Electric- three of the four power plants in this industrial park, and one of the two oil refineries here [ for Tesoro Corporation, a publicly traded independent petroleum company]. We've worked with Hawaiian Electric on the development stage of this new plant since June, 2007, in a design- assist capacity." The generating plant was in the planning stage as early as mid- 2005, when Hawaiian Electric applied to the Public Utilities Commission for permission to build it. At the same time, Hawaiian Electric filed an application for a community benefits package, locally known as " give- backs," for those in the neighborhood of the proposed plant. The commission approved the new generating unit in May 2007 and also approved a partial community benefits package in June 2007. August 09 www. bus- ex. com 147
Hawaiian Dredging Construction 148 www. bus- ex. com August 09 plant ( also likely to be constructed by Hawaiian Dredging) and to cooperate and comply with the Environmental Policy for Procurement of Biodiesel from Palm Oil and Locally Grown Feedstocks, prepared by Hawaiian Electric and the Natural Resources Defense Council. Hawaiian Electric notes that this new generating unit is primarily intended to supplement existing capacity during periods of peak use; however, it will also be operated during non- peak hours if other units are not reasonably able to serve system needs. " There has been a lot of development on the island," says Valentine, " and the demand curve for power was getting close to the capacity curve, so this peaking unit will be fi red up and energized at times of peak demand. During a typical day, power demand changes considerably, and since Hawaii lacks a major industrial base, the changes are more pronounced. Also, because we're isolated, we're not part of a grid shared by other states, so Hawaiian Electric has to constantly monitor and adjust the output of its generating capacity to meet the demand at peak times. And since it has been using older boilers, which are slower to fi re up, it has to predict a lot of the time. But this new peaking unit can come online and be operational in minutes." As far as biodiesel, Valentine explains, it currently has to be imported, while Imperium has its new biodiesel plant designed and constructed to produce the fuel locally. " A number of state agencies have been mandating the use of renewable fuels such as biofuel; in fact, Hawaiian Electric has a pilot project that involves converting some baseline boilers to biofuel, to see how well it works and how feasible it is to use in some of its other systems."