Exhibit A - Scope of Work.docx

DOCX document 24 KB Posted

Attached to
10-Year Capital Needs and Reliability Study
Solicitation number
S-R33123-00013779
Issued by
Wasco County, Oregon

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This document is an Exhibit A Scope of Work for Northern Wasco County Public Utility District (PUD), focusing on a comprehensive electrical system analysis and improvement plan. The scope of work covers a detailed review of the existing electrical infrastructure, including condition assessments of multiple substations such as Columbia Heights, Seufert, 10th Street, 2nd Street, Discovery, Gorge Switchyard, Dufur, Tygh Valley, and Three Mile. The document provides an in-depth examination of the current system's capabilities, load forecasting, and proposed system improvements, with recommendations categorized into short-term and future improvements, and prioritized as high, medium, and low priority projects.

The scope of work includes a thorough analysis of system load growth, feeder and substation load projections, and planning criteria such as equipment capacity, voltage drop, power factor, protection, reliability, and safety considerations. The document outlines specific technical assessments, including transformer outage analyses, distribution circuit evaluations, and field assessments of each substation. The recommended improvements are accompanied by planning-level cost estimates, suggesting a comprehensive approach to modernizing and expanding the electrical infrastructure for Northern Wasco County PUD. The analysis provides a strategic roadmap for system upgrades, addressing current limitations and preparing for future electrical demand and reliability requirements.

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Exhibit A Scope of Work Section 1 – Executive Summary

· Introduction

· Existing System Analysis

· Condition Assessment of Substations

· Recommended System Improvements – Year 1

· Recommended System Improvements – Future Years

· High Priority Projects

· Medium Priority Projects

· Low Priority Projects Section 2 – Introduction

· Overview of Northern Wasco County PUD’s Electrical System Section 3 – Study Overview

· Contributions

· Data Assumptions

· Distribution System Model

· Modeled Load Allocation Section 4 – Planning Criteria

· Introduction

· Forecasted and Projected Load Scenarios

· Equipment and Conductor Maximum Capacity/Loading

· Economic Conductor Selection

· Voltage Drop

· Power Factor

· Protection and Sectionalizing

· Reliability

· Load and Phase Balance

· Load Shifting Capabilities – Feeder Redundancy

· Age

· Safety

Section 5 – Existing System Review

· Power Transformers

· Substation and Line Voltage Regulators

· Capacity Limits

· Distribution Circuits

· Substation Transformer Outage Analysis

· Second Street Transformer 1 Out of Service – Feeders 11, 12, and 13

· Second Street Transformer 2 Out of Service – Feeders 14, 15, 16, and 17

· 10th Street Out of Service – Feeders 23 and 24

· Columbia Heights Out of Service – Feeders 23 and 24

· Seufert Out of Service – Feeders 41 and 42 Section 6 – Assessment of Existing System Conditions

· Columbia Heights Substation

· Field Assessment Summary

· Seufert Substation

· Field Assessment Summary

· 10th Street Substation

· Field Assessment Summary

· 2nd Street Substation

· Field Assessment Summary

· Discovery Substation

· Field Assessment Summary

· Gorge Switchyard

· Field Assessment Summary

· Dufur Substation

· Field Assessment Summary

· Tygh Valley Substation

· Field Assessment Summary

· Three Mile Substation

· Field Assessment Summary Section 7 – Load Forecast

· Introduction

· System Load Growth

· Feeder Load Growth

· Substation Load Growth

Section 8 – Future System Analysis

· Introduction

· Proposed System Improvements

· Short-Term System Improvements

· Proposed Substation Additions

· Feeder Improvements Section 9 – Recommended Plan

· Recommended System Improvements – Year 1

· Recommended System Improvements – Future Years

· High Priority Projects

· Medium Priority Projects

· Low Priority Projects

· Planning Level Cost Estimates

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