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Criterion Details

PD-17 Energy Efficiency

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Project Development Scorecard

  • Rural Basic
  • Urban Basic
  • Rural Extended
  • Urban Extended


Reduce energy consumption of lighting systems through the installation of efficient fixtures and the creation and use of renewable energy.

Sustainability Linkage

Triple Bottom Line

Reduction of energy consumption and conversion to renewable energy sources support the environmental and economic sustainability principles by reducing the demand for fossil fuel generated energy, reducing emissions, and reducing in long-term energy costs.

Background & Scoring Requirements

Scoring Requirements

Requirement PD-17.1

1 point. Evaluate Energy Needs and Implement Alternatives

Evaluate energy needs for the project and implement alternatives to reduce power consumption while still meeting lighting and safety standards. These alternatives could include reduction of lighting; retrofit or installation of energy efficient luminaires, beacons, and traffic signal equipment and lamps; replacing signs with retro reflective signs to eliminate sign lighting; and installation of renewable energy sources.

Requirement PD-17.2

1-6 points. Reduce Total Energy Consumption

Reduce the energy consumption on the project through the installation of energy efficient lighting; the use of cut-off or full cut-off fixtures; and signal fixtures (e.g. LED lighting, induction lighting, or other new technology that is Underwriters Laboratories Inc. (UL) listed for the intended use) and through the installation of autonomous, on-site, renewable power sources (e.g., solar panels). All lighting facilities and systems considered for this criterion must be appropriate for the project. This means that installing pedestrian safety lighting on a project with no pedestrian accessibility will not be awarded credit. Similarly, lighting for new and/or improved driveways and parking lots are subject to the credits only if they are included within the project scope and budget boundaries. 

Points are awarded based on the percentage of reduced power use. To determine this reduction, compare the annual power consumption for the baseline condition to the power consumption for the energy efficient electrical system design. Calculations for power consumption should be based on the following assumptions:

  • The baseline condition should be calculated using the existing electrical system and assuming new improvements were to be constructed with high-pressure sodium (HPS) luminaires with cut-off optics.
  • The baseline condition should be based on the lighting system operating 12 hours/day and 7 days/week.
  • The two designs must both meet the same lighting standards.
  • Wattage used for energy consumption shall be based on luminaire "input wattage" not lamp wattage.
  • Consider contributions by renewable energy sources as a reduction in the power required.
  • Do not include power savings associated with daylight sensors and activity level sensors.

Use Table PD-17.2.A to calculate the number of points awarded based on these calculations.


Requirement PD-17.3

1 point. Establish Auditing Plan

Establish a plan for auditing energy use after the project is complete, as part of operations and maintenance.


None referenced.

Case Studies & Criterion Examples

TxDOT - Embedding INVEST in Contracting for the Corpus Christi Harbor Bridge: The Texas Department of Transportation (TxDOT) used INVEST during the procurement process for the Harbor Bridge Project in Corpus Christi. TxDOT’s request for proposals (RFP) required that bidders describe how their proposal would meet a “Platinum” rating on the INVEST PD module and a “Silver” rating on the INVEST OM module. The sustainability score, along with price and other factors, was part of the total score for selecting among the four bidders. This provided a strong incentive for bidders to achieve high sustainability at low cost. The winning bidder committed to a range of sustainability practices that will bring tangible benefits to the community.

Arizona DOT - Using INVEST to Integrate Sustainability: The Arizona Department of Transportation (ADOT) decided to use all three modules of INVEST – System Planning, Project Development, and Operations and Maintenance – to help the agency meet its sustainability goals across the transportation life cycle.  ADOT used INVEST to integrate and advance existing sustainability efforts and to push forward new efforts.  INVEST’s comprehensive sustainability framework and criteria helped ADOT institutionalize sustainability across the agency and with local partners through inclusion in manuals, trainings, and awards.  This case study focuses on ADOT’s use of the Project Development module.

Arizona DOT - LED Life-cycle Costing Analysis and Life-cycle Assessment: The Arizona Department of Transportation (ADOT) is engaged in the early stages of converting existing it’s High Pressure Sodium (HPS) roadway lighting system to Light Emitting Diode (LED). The existing roadway lighting system operated and maintained by ADOT features more than 28,000 luminaries with an operating cost of approximately 4 million dollars. The conversion is expected to produce energy, greenhouse gas emission, and cost savings over the lifespan of the LED system due to reductions in electricity demand and maintenance.

Scoring Sources

The project is considered to have met this criterion if the requirements above can be reasonably substantiated through the existence of one or more of the following documentation sources (or equal where not available):

  1. Documentation of energy usage evaluation and reduction plan. 
  2. Calculations documenting energy usage if the roadway project was to be constructed with high-pressure sodium (HPS) luminaires and fixtures, the expected energy usage as designed, and the resulting energy savings as a percentage of calculation no. 1. 
  3. Contract documents and/or cut sheets of the luminaires being installed on the project. 
  4. Sample cut sheets and specifications for each technology installed on the project that shows the expected wattage of the component(s) used or generated. 
  5. Documentation of plan for auditing energy use after construction.