Keene Housing: Harper Acres

Background

Harper Acres is a property with 112 residential units spread among 15 buildings. It was constructed in 1985 and has one master metered electric account servicing all of the facility’s energy needs, with the exception of a small amount of propane that services two buildings. The property had several needs after 30 years of use, but the most pressing opportunities for improvement were the outdated and inefficient lighting and HVAC systems. Keene Housing is fortunate that Harper Acres is serviced by a single commercial electric meter, because its comprehensive energy efficiency upgrades impacted the entire property including common areas, exterior lighting, and residential units.

Harper Acre’s HVAC system is part of the local utility HEATSMART “interruptible rate” program which permits the electricity provider to reroute power away from heating units during high demand times. The participation in this rate savings program is possible because the residential units utilize a combination of wall-mounted ductless and electric thermal storage (ETS) heating units which provide heating when electricity is rerouted from the primary heat pump systems. Unfortunately, the primary systems are old and inefficient and the ETS units are generally misunderstood and used incorrectly and potential saving opportunities are lost.

Solutions

Keene Housing took a multi-step approach to the upgrades over a two-year period. The planned first phase of the energy retrofit involved a comprehensive facility-wide lighting upgrade in order to fully capitalize on the utility program support the properties single utility meter configuration qualifies for. Keene Housing will retrofit all residential units, common area spaces, and exterior lighting with a combination of new lighting fixtures, lamps and lighting controls.

The state-of-the-art lighting technology will include:

LED exterior and decorative pendant mount luminaires
LED recessed canisters
2x4 LED recessed troffers
LED drum retrofit kits with occupancy sensors
Occupancy sensors in offices and other low-traffic areas
Astronomic time clocks on exterior fixtures

Keene Housing will substitute high-performance linear T8 lamps and ballast systems for the areas with less foot traffic, where the above measures would be less cost effective.

Keene Housing’s lighting retrofit is an attractive investment opportunity because it qualifies for incentives through the local utility’s commercial lighting program, a program which covers 50% of the implementation cost. These cost savings position the lighting retrofits as a low-cost first step toward reducing energy demands at the property. Keene Housing will install the retrofits over a period of two years using more than $90,000 in incentives from its utility; the remaining portion of the project costs were included in Keene Housing’s 2016 budget for capital upgrades. This project has a short payback period of 3.5 years, largely due to its use of incentives.

Since Harper Acres is serviced by a single electric utility meter type and account, it stands apart from the other properties Keene Housing owns that are serviced by multiple meter types and accounts.

ANNUAL ENERGY USE

ANNUAL ENERGY COST

ANNUAL WATER USE

ANNUAL WATER COST

ANNUAL PLANT ELECTRICITY USE

ANNUAL PLANT ELECTRICITY COST

IN BUILDING ENERGY USE

IN BUILDING ENERGY COST

ACROSS NETWORK USE

ACROSS NETWORK COST

ANNUAL EMISSIONS

USE

COST

Harper Acres

Keene Housing: Harper Acres

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Harper Acres