Energy Conservation

Print
Press Enter to show all options, press Tab go to next option

Energy Savings Performance Contract

What is an ESPC?

According to the Oregon Department of Energy website, an Energy Savings Performance Contract (ESPC) is an agreement between an energy services company and a building owner. Oregon defines it as a public contract between a state agency and a qualified energy service company for the identification, evaluation, recommendation, design and construction of energy conservation measures, including a design-build contract, that guarantee energy savings and performance.

Background

The City’s past energy projects targeted street lights and large usage equipment within the water and wastewater utility.  This effort targeted the publicly owned facilities requiring an initial energy audit be completed to determine economically feasible projects.  Partnering with an Energy Services Company (ESCO) like Ameresco brings an expertise to the project with the experience and resources to help us identify and execute a fiscally viable project.

Buildings included in the ESPC were the Senior Center (dropped from the project), Police Department, Roberts Field (including the Air Rescue and Fire Fighting Building and Snow Removal Building), Public Works Complex, Waste Water Treatment Plant and Juniper Golf Course.  The total square footage of the buildings is 268,437 ft2 (that is without the Senior Center). 

Project Overview

Since 2015, the City of Redmond  has embarked on a $1.2 million Energy Savings Performance Contract (ESPC) to improve City buildings, enhance efficiency and reduce costs.   As part of the project, Ameresco conducted an energy audit on the more than 272,000 square feet of building space and identified energy conservation measures that the company will design, construct, commission, and verify.   Projects include comprehensive lighting upgrades, controls upgrades and the installation of two 10 kW solar photovoltaic systems at Roberts Field Municipal Airport.  These improvements are expected to enhance the comfort for the passengers and building occupants, and improve the light quality at the facilities.

The City of Redmond realized more than $100,000 annually in energy savings once the eleven projects were completed in late-spring 2015. In addition, the City leveraged the energy savings of the project to secure approximately $159,000 in utility incentives from the Energy Trust of Oregon.

The environmental benefits associated with the reduction of more than 1.2 million pounds of CO2 from this project was equivalent to planting 22,672 trees or eliminating 186 cars from the road annually.

Project Financials

The ESPC Project has a 90% energy savings guarantee.

Annual Energy Savings

Total

90% Guarantee Energy Savings

100% Annual Savings

90% Annual Savings

Electrical Savings

1,201,545 kWh

1,081,391 kWh

$91,176

$82,058

Electrical Savings

1,650 kW

1,485 kW

Included Above

Included Above

Natural Gas Savings

10,502 therms

9,452 therms

$8,844

$7,960

Total

 

 

$100,020

$90,018

Total guaranteed maximum project cost was $1,209,641.  The Energy Trust of Oregon offered $159,645 in utility incentives.  The net project cost was estimated to be $1,049,996.  This represents about a 25% reduction in energy usage of the facilities included in the study.

 1

Energy Projects at Each Building

The following are the list of measures and locations of the installations.

Police Department

Police Department Lighting Upgrade

This measure provides an upgrade to lighting throughout the facility.  Where possible, 3-lamp fixtures were replaced with 2-lamp, low wattage T-8 fixtures that provide comparable lighting levels with reduced electrical input. Exterior high metal halide lighting were replaced with improved high efficiency LED fixtures.

Public Works Complex

Public Works Warehouse DDC Controls AHU-1 and 2

This improvement integrated the control of AHU-1 and AHU-2 into the existing Automated Logic DDC system. Points list and sequences of operation to be developed during the project design phase. Control functions to include:

  • Morning warm-up with outside air dampers closed
  • Night low limit and high limit for heating and cooling (55°F /85°F).
  • Alarming and trending capability of all inputs and outputs.
  • Web accessibility and BACnet capability.
  • Full calendar time of day and holiday scheduling.

Public Works Warehouse Wall Heater Programmable Thermostats

The two restrooms within the Warehouse are each heated with a 2 kW electric wall heater connected to manual twist knobs for temperature control. The two locker rooms within the Warehouse are each heated with a 1.5 kW electric ceiling heaters with manual twist knobs for temperature control. The spaces are kept between 65°F and 70°F 24 hours a day.

This measure adds four (4) line-voltage programmable thermostats to the four electric wall heaters in the Warehouse restrooms and locker rooms.

Public Works Water Warehouse Programmable Thermostats

The training area within the Warehouse is heated with a 1.5 kW electric wall heater with a manual temperature control knob and a 1.5 kW wall mounted electric unit heater with a manual thermostat. The Water Warehouse floor is heated with two 5 kW electric unit heaters on manual thermostats. The spaces are kept between 60°F and 70°F 24 hours a day year round.

This measure adds a line-voltage programmable thermostat to the electric wall heater and three low voltage programmable thermostats to replace the manual thermostats in the Water Warehouse floor and training areas.

Public Works Water Department Well Office Thermostat

Electric heating in small control building is managed by two (2) manual dial thermostats connected to a baseboard and cadet heater respectively.

This measure replaces two (2) manual thermostats with 7-day programmable thermostats.

Public Works & Water Lighting Upgrade

This measure provides an upgrade to a portion of the lighting throughout the facility. Lighting occupancy controls will be added to reduce burn hours in key locations. Program start ballasts will replace existing ballasts as needed to accommodate occupancy sensor operation. Exterior metal halide lighting will be replaced with improved high efficiency LED fixtures.

Wastewater Treatment Plant

WWTP Programmable Thermostat for Office Areas

The electric furnaces serving the Lab/Office building are controlled by thermostats that are difficult to program, causing the facility to run in occupied mode 24 hours per day.

This measure adds two (2) programmable thermostats to replace the existing thermostats.

WWTP Garage Unit Heater Control

The garage area attached to the Lab/Office building is heated with two 15 kW electric unit heaters controlled by a manual temperature control knob. The space heating setpoint is kept between near 70°F 24 hours a day year round.

This measure adds a line-voltage programmable thermostat to replace the existing manual thermostat.

WWTP Lighting Upgrade

This measure provides an upgrade to a portion of the lighting throughout the facility. Program start ballasts will replace existing ballasts as needed to accommodate occupancy sensor operation. Exterior metal halide lighting will be replaced with improved high efficiency LED fixtures.

Juniper Golf Course

Juniper Golf Direct Digital Control Tune-Up

The three roof-top air handlers the clubhouse building are controlled by thermostats that are difficult to program, causing the facility to run in occupied mode 24 hours per day.

This measure adds three (3) programmable thermostats to replace the existing thermostats for improved scheduling and setback control and provides a review of equipment operation to address any deficiencies. The air handlers will undergo a full service and battery of diagnostic tests to confirm proper function.

Kitchen Hood Control

This measure will provide increased controllability of the exhaust system serving the restaurant kitchen. A variable frequency drive (VFD) will be linked to the existing 1 hp exhaust fan motor to all for the speed of the motor to be adjusted based on operating conditions. The speed will be regulated manually by the operator. The exhaust fan will be controlled by a timer to shut off when not in use.

Juniper Golf Lighting Upgrade

This measure provides an upgrade to a selected lighting throughout the facility. Program start ballasts replaced existing ballasts as needed to accommodate occupancy sensor operation. Exterior metal halide lighting will be replaced with improved high efficiency LED fixtures.

Roberts Field

Terminal DDC Upgrade

The Terminal HVAC systems are controlled by a Siemens Talon DDC system. The system does not have CO2 sensor or occupancy sensors, and therefore no demand controlled ventilation or occupancy standby control. The existing program sequences appear to be resulting in fan speeds near 100% of capacity full time on all of the large air handlers. The controls software is due for an upgrade. This EEM applies to air handlers 9F2, 7E2, 7F2, 7I2, and 6G2.

This measure provides several upgrades to existing Siemens Talon HVAC direct digital control system, including CO2 monitoring for ventilation control, occupancy sensors for vacancy setback control, software upgrades, and control program optimization. Software upgrades will be installed to improve operation and fix known Java incompatibility issues of the existing control software.

Air Rescue and Fire Fighting Building Direct Digital Control Upgrade

The ARFF facility is served by Carrier furnaces with fixed outside air volumes. The ARFF has two furnaces, F-1 (1,200 CFM) serves the residence area and F-2 (2,000 CFM) serves the main interior area. Each furnace is controlled by a digital thermostat. Two gas-fired radiant tube heaters condition the vehicle bay and manual thermostats.

This measure extends the existing Siemens Talon Web-based, open-protocol, DDC energy management and temperature control system at the Terminal to the ARFF primary furnace. New capabilities to include: remote temperature and schedule monitoring and control, vacancy setback control, and graphical interface with remote accessibility. Scope does not affect vehicle bays or dormitory area of the facility.

Snow Removal Equipment Building HVAC Control

The SRE facility is served by Carrier furnaces with fixed outside air volumes. The SRE furnaces, which are approximately 2,000 and 1,200 CFM, condition the office area the work area. The vehicle bay and shop area is freeze protected by four electric gas unit heaters and two gas-fired radiant tube heaters. All of the unit heaters and radiant heaters are on one manual thermostat.

This measure proposes extending the existing Siemens Talon Web-based, open-protocol, DDC energy management and temperature control system to the SRE. New capabilities to include: remote temperature and schedule monitoring and control, vacancy setback control, and graphical interface with remote accessibility. This scope also includes the installation of programmable thermostats in the vehicle bay and shop area to separate the infra-red radiant heaters from the unit heaters and to allow for scheduling of the heaters.

Roberts Field Lighting Upgrade

This measure upgrades selected fluorescent, metal halide, and incandescent fixtures in the Airport Terminal to high efficiency fluorescent and LED fixtures along with the addition of occupancy sensors to control applicable lighting circuits. Also included is replacement of existing exterior high pressure sodium and metal halide fixtures with LED lamps.

Air Rescue and Fire Fighting Building Lighting Upgrade

This measure upgrades selected fluorescent, incandescent, and metal halide fixtures in the Air Rescue and Fire Fighting Building to high efficiency fluorescent and LED fixtures. Also proposed is the addition of occupancy sensors to control applicable lighting circuits. Replacement of metal halide fixtures in vehicle bay with high output T8 fixtures and replacement of existing exterior high pressure sodium fixtures with LED lamps is also included.

Snow Removal Equipment Building Lighting Upgrade

This measure proposes upgrades for selected fluorescent and incandescent fixtures in the SRE building to high efficiency fluorescent and LED fixtures. Also proposed is the addition of occupancy sensors to control applicable lighting circuits. Replacement of existing exterior high pressure sodium fixtures with LED lamps is proposed as well.

Air Rescue and Fire Fighting Building Solar Photovoltaic System

This measure provides a 10 kW rooftop solar photovoltaic array, inverters, hardware, and electrical grid connections for on-site electricity generation.

Snow Removal Equipment Building Solar Photovoltaic System

This measure provides a 10 kW rooftop solar photovoltaic array, inverters, hardware, and electrical grid connections for on-site electricity generation.

City Wide Measures

PC Power Management

This measure will install enterprise level personal computer (PC) power management software to control and monitor PC power savings across the City’s machines. The software will be capable of round the clock PC power management and auto shutdown, proactively managing PC health and energy use.  It will remotely monitor and control the PC fleet, as well as enable security updates, without user data loss.