MEP: Mobility Energy Productivity Metric
NREL's Mobility Energy Productivity metric, or MEP, quantifies the ability of an area's transportation system to connect individuals to goods, services, employment opportunities, and other activities while accounting for time, cost, and energy.
In other words, the metric measures how efficiently connected a place is.
Focus on People
The Mobility Energy Productivity metric offers an innovative approach to characterize, measure, and inform the movement of people within a given location or region. The ability to quantify mobility using MEP has the potential to create more livable communities that offer transportation choices that are affordable and accessible, create economic opportunities, and lead to a higher quality of life for citizens.
Building on accessibility theory, the basis of MEP is the proximity and convenience of access to a variety of goods, services, employment opportunities, and other activities reachable by various forms of mobility. Therefore, a location with access to many opportunities via a variety of travel modes, within a short amount of time, and with low energy and the least cost will have a high numeric MEP score.
MEP can be used to track changes in mobility within a single city or given location over time. It can measure current levels of mobility at a specific location and then determine how various technological advancements, services (e.g., ride hailing, micromobility, electric vehicles, automated vehicles), and infrastructure investments (e.g., bike lanes, mixed-used development) may impact the mobility potential of that location over time.
When applied to major attractors such as airports (then dubbed the Airport MEP), it measures the ease of accessing an airport from anywhere in a city.
For more information about MEP, refer to the feature article A New Way To Measure Mobility Potential of Cities.
Focus on Freight
The Freight MEP quantifies the ease of shipping goods between cities or states via various modes. It can be used to quantify the productivity of current and future freight systems from the shipper’s perspective. It provides a mathematical framework for quantifying freight productivity—connecting freight demand to freight supply while accounting for inputs such as cost, energy, distance, time, logistics, and ease of shipping goods via various modes.
For more information about F-MEP, refer to the news article New Metric Quantifies Productivity of Freight Mobility Systems.
The following documents provide detailed information about the Mobility Energy Productivity metric. For NREL’s full collection of MEP-related documents, visit the Publications Database.
A Comprehensive Approach to Measure the Mobility Energy Productivity of Freight Transport: Preprint, Transportation Research Board Annual Meeting (2020)
Comprehensive Approach To Measure the Mobility Energy Productivity of Freight Transport, Transportation Research Record: The Journal of the Transportation Research Board (2020)
A Novel and Practical Method To Quantify the Quality of Mobility: The Mobility Energy Productivity Metric: Preprint, Transportation Research Board Annual Meeting (2019)
Novel and Practical Method To Quantify the Quality of Mobility: Mobility Energy Productivity Metric, Transportation Research Record: The Journal of the Transportation Research Board (2019)
Measuring Mobility Potential: New Metric Quantifies Mobility Energy Productivity, NREL Fact Sheet (2019)
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