04-06-15 JDA - Laserfiche WebLink

Home Browse Search

TCAAP Energy Integration Resiliency Framework Energy Source Implementation 27 3.1.3. Economic Analysis 3.1.3.1. PV System Components Solar PV power plants are simple in their operation. The main components of a solar PV plant include PV Modules, racking, inverters, transformers, combiner boxes, DC cabling and AC cabling. The modules convert the solar irradiance to DC power. A collection of modules are electrically wired together to form what is referred to as a “string.” Multiple strings are combined together into a single DC output in a combiner box. All outputs from the combiner boxes in a block are run to a central skid where they are connected to the inverter. The inverter converts the DC module power into AC power and feeds the AC output through a medium-voltage (MV) transformer. This transformer steps-up the inverter voltage to the solar arrays main collection system voltage. The inverters and medium-voltage transformers are often co-located on a platform referred to as the power conversation station, sometimes referred to as a skid. If a site has a local substation, then all the outputs from the skids feed into the substation where a generator step-up unit outputs the main interconnection voltage. Racking is an integral part of any solar plant as it provides the support for the modules. In addition to proving a fixed point to which the modules are attached, racking serves as the means to optimize the angle between module surfaces and the solar irradiance. This angle has significant impacts on a solar plant’s energy production. There are two main classes of racking systems, tracking and fixed-tilt, the latter of which was used in this layout. 3.1.3.2. Capital and Operations and Maintenance Costs The upfront capital construction costs are incurred during the development and construction of the plant. These costs include material costs, installation costs, contractor markup, and project indirect costs. The capital costs are impacted by relative system size (larger systems have the benefit of economies of scale), project location, and a collection of market factors. Project capital costs are commonly presented as a cost per installed watt basis ($/W). This allows for project costs to be expressed independently of system size and provides for an easy comparison of costs for systems with difference characteristics. In addition to the cost of the solar PV array, the existing Primer Tracer site will need to have the existing infrastructure removed and the site will need to be redeveloped, before the project can be constructed. The land acquisition is expected to occur through a public benefit sale from the U.S. Government if the County acquired the property. If the MNARNG took possession it would be included in their license and remain in the ownership of the U.S. Government. The cost of the land acquisition is anticipated to be $0 due to the nature of the site and the proposed usage. It is assumed that there will be no property taxes levied against the properties as the land owner will be a government entity. The estimated cost to remove the existing infrastructure and redevelop the 40