EISA Section 142 Statutory Requirements for Increasing Alternative Fuel Use

Section 142 of the Energy Independence and Security Act (EISA) of 2007 (42 U.S.C. § 6374e(a)(2)), emphasis added, says:

"[N]ot later than October 1, 2015, and for each year thereafter, each Federal agency shall achieve at least a 20 percent reduction in annual petroleum consumption and a 10 percent increase in annual alternative fuel consumption, as calculated from the baseline established by the Secretary for fiscal year [FY] 2005."


The applicability of Section 142 of EISA is the same as the Energy Policy Act (EPAct) of 1992. See the Applicability page to determine which agencies and vehicles are subject to the EPAct 1992 requirements and which vehicles may be exempted.

FEMP Resources and Best Practices

Calculating Alternative Fuel Use

What fuels are classified as alternative fuels?

Person plugging in an LPG vehicle.

Alternative fuels are defined by Section 301 of the Energy Policy Act (EPAct) of 1992 (42 U.S.C. 13211(2)); the Secretary of Energy may expand this definition to include other fuels by rule. As of the date of this guidance, the following fuels are defined or designated as alternative fuels:

  • Methanol, denatured ethanol, and other alcohols
  • Mixtures of 85% or more of methanol (M85), denatured ethanol (E85), and other alcohols with gasoline or other fuels
  • Natural gas and liquid fuels domestically produced from natural gas (e.g., compressed natural gas [CNG] and liquefied natural gas [LNG])
  • Liquefied petroleum gas (i.e., LPG or propane)
  • Coal-derived liquid fuels
  • Electricity (including electricity from solar energy)
  • Biodiesel (B100)
  • Fuels (other than alcohol) derived from biological materials
  • Hydrogen
  • P-Series fuels.

P-Series fuels are clear liquid fuels with octane ratings between 89 and 93, designed for use in flexible fuel vehicles and containing 35% natural gas liquids, 45% ethanol, and 25% biomass-derived fuel. See 64 FR 26822 (May 17, 1999).

What types of fuels are included in the calculation of alternative fuel use?

Fuel that is counted in calculating alternative fuel use includes:

  • All alternative fuels used in all vehicles in the United States, including vehicles considered exempt under the alternative fuel use requirements
  • Biodiesel component of biodiesel blends greater than 20% used in all vehicles in the United States, including vehicles considered exempt
  • All electricity used in EVs and LSEVs in the United States.

Fuel that is not counted in calculating subject petroleum fuel use includes:

  • Petroleum (gasoline, diesel, and the diesel component of biodiesel blends) used in any vehicle.
  • Alternative fuels used in vehicles outside the United States.

How do you count electricity used in electric vehicles toward alternative fuel use?

All electricity used to charge electric vehicles (EVs) (from the grid, including electricity generated at the Federal site) will be counted toward agencies’ alternative fuel use requirements. Currently, all electricity consumed in battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs) counts toward an agency’s alternative fuel consumption. Agencies may also count all electricity consumed in an agency’s LSEVs toward meeting its alternative fuel use increase requirements.

It is important to note that electricity generated in a hybrid electric vehicle (HEV) or PHEV by the internal combustion engine or regenerative braking system, which recharges the vehicle’s battery, is not counted toward agency alternative fuel use requirements, although it does support petroleum reduction goals by improving vehicle efficiency.

How do you measure and report electric vehicle energy consumption?

Dashboard of an electric vehicle.

To receive alternative fuel use credit for the electricity used to charge BEVs, LSEVs, and PHEVs, agencies will have to report EV electricity consumption in Federal Automotive Statistical Tool (FAST). Reporting electricity use by EVs may be a challenge for fleet managers. The most comprehensive way to monitor electricity consumption from an EV is through the vehicle interface and web application or through aftermarket telematics, such as GSA’s telematics solution. Since electricity used to charge EVs is frequently reported as electricity consumed by a facility, electricity consumption for EVs should be metered separately from facility consumption. This can be done at dedicated EV charging stations through a separate utility meter or "smart" electric vehicle supply equipment (EVSE) unit. Other methodologies may also be appropriate for calculating EV electricity use if no other options exist, such as estimating electricity consumption using the vehicle fuel economy rating and electric miles traveled.

Electricity consumption (kWh) is equal to Fuel economy (kWh/mile) divided by Electric miles traveled (miles)

Federal agencies are responsible for the accurate measurement and reporting of electricity used in BEVs, LSEVs, and PHEVs. To review alternative options for calculating EV energy consumption, please review the Electric Vehicle Technology Overview video from FEMP.

​How are biodiesel blends counted toward alternative fuel use?

Under the Section 301 EPAct 1992 definition of alternative fuels, biodiesel blends are not considered an alternative fuel. However, for biodiesel blends equal to or greater than 20%, agencies may count the pure biodiesel component of the blend toward agency alternative fuel use requirements.

How do you calculate the pure biodiesel component of biodiesel blends?

Start with the volume of biodiesel blends used in subject vehicles. Multiply this volume by the percentage of the biodiesel blend that is biodiesel. For example, B20 is a blend of 20% biodiesel and 80% diesel. If a vehicle uses 100 gallons of B20, 20 gallons count as pure biodiesel consumption toward agency alternative fuel use requirements.

How is alternative fuel use measured?

Alternative fuel use is measured in gasoline gallon equivalents (GGEs), which translate the energy content of fuel into units representing the energy content of one gallon of gasoline. The table below presents the fuel conversion ratio table to convert alternative fuel "natural" units to GGEs.

Alternative Fuel Use Conversion Ratios
Fuel TypeNatural UnitsConversion to GGE
B20gallons1.121 GGE/gallon of B20
B100gallons1.015 GGE/gallon of B100
CNGgallons at 2,400 psi0.18 GGE/gallon of CNG at 2,400 psi
gallons at 3,000 psi0.225 GGE/gallon of CNG at 3,000 psi
gallons at 3,600 psi0.27 GGE/gallon of CNG at 3,600 psi
hundred cubic feet0.83 GGE/ft3 of CNG
E85gallons0.72 GGE/gallon of E85
ElectricitykWh0.03 GGE/kWh of electricity
Hydrogenkg1.0 GGE/kg of hydrogen
LNGgallons @ 14.7 psi and -234°F0.66 GGE/gallon of LNG
LPGgallons0.74 GGE/gallon of LPG
R100gallons1.015 GGE/gallon of R100

Determining the FY 2005 Alternative Fuel Use Baseline

For most agencies, the FY 2005 alternative fuel baseline is simply the sum of total alternative fuel and the biodiesel component of biodiesel blends (20% and greater) used in all domestic vehicles in an agency’s fleet as reported in FAST for FY 2005. Federal agencies with extremely low alternative fuel use in FY 2005 (less than 5% of the agency’s total fuel consumption) must use a minimum alternative fuel baseline.

Methodology for Establishing a FY 2005 Alternative Fuel Baseline

The minimum baseline is the lesser of (1) 5% of total subject fuel (petroleum and alternative fuel) consumption or (2) the greater of 500,000 GGE or the amount of alternative fuel consumed in FY 2005.

The FY 2005 alternative fuel baseline for agencies with FY 2005 alternative fuel usage greater than the minimum baseline will be the FY 2005 level (see the table and figure below).

Methodology for Establishing the FY 2005 Alternative Fuel Baseline
The alternative fuel baseline will be the actual FY 2005 alternative fuel consumption if it exceeds the minimum alternative fuel baseline.
If not, the minimum alternative fuel baseline will be the baseline.

The minimum alternative fuel baseline is the lesser of:

• 5% of total subject fuel use (subject petroleum and alternative fuel usage)

• 500,000 GGE or the FY 2005 alternative fuel usage (whichever is greater)

Fleet handbook fuel baseline.

Example Alternative Fuel Use Baseline Calculations

The table below presents some example alternative fuel baseline calculations to assist agencies in determining their FY 2005 alternative fuel baseline.

Example Alternative Fuel Baseline Calculations (GGEs)
Total Subject Fuel Use5% of Total Subject Fuel UseMinimum GGE Level (Lesser of 5% or 500,000 GGE)Actual FY 2005 Alternative Fuel ConsumptionResulting FY 2005 Alternative Fuel BaselineMethod of Resulting Baseline
18,000,000900,000500,000800,000800,000FY 2005 alternative fuel consumption
16,250,000812,500500,000400,000500,000Minimum GGE level
18,000,000900,000500,0004,500,0004,500,000FY 2005 alternative fuel consumption
5,000,000250,000250,000100,000250,0005% of total subject fuel consumption
5,000,000250,000250,000400,000400,000FY 2005 alternative fuel consumption

Working with FEMP to Determine Your Baseline

Note that some agencies have requested and been granted changes to their baselines by the Federal Energy Management Program (FEMP). These baseline revisions were granted based on documentation submitted by agencies supporting inaccuracies with FY 2005 subject petroleum consumption figures in FAST. Each agency should review its FY 2005 alternative fuel consumption figures currently in FAST for accuracy and, if this number is found to be incorrect, work with FEMP to determine its appropriate baseline.

Determining Section 142 Alternative Fuel Use Compliance

To determine the alternative fuel consumption each year, agencies must sum together all types of alternative fuel consumed by their subject fleet, including biodiesel used in blends of B20 or higher. The agency will then compare this to the alternative fuel consumption requirement for that year to determine compliance.

Each Federal agency (subject to the alternative fuel use increase requirements) complies if it increases its annual alternative fuel use by at least 10% compared to a FY 2005 baseline by FY 2015 and to maintain that increased level for each year thereafter.

Example: Agency with FY 2005 Baseline of 100,000 GGE

The table and figure below show an example of an agency's target alternative fuel use increase requirements relative to its FY 2005 baseline.

Calculation of Example Alternative Fuel Use Increase Requirements Based on a FY 2005 Alternative Fuel Baseline of 100,000 GGE
Fiscal YearFY 2005 Alternative Fuel Baseline (GGE)Annual Alternative Fuel Use Increase Requirement (Percentage of FY 2005 Baseline)Required Increase in Alternative Fuel Use from FY 2005 Baseline (GGE)Minimum Alternative Fuel Use (GGE)
2005 (Baseline)100,000Not Applicable (Baseline)
2016 and onwards100,00010%10,000110,000
Line graph with a dot reading 100 starting at 100 alternative fuel use (Thousands of GGE) in the year 2005 and moving up to 110 in the hear 2015.

Example Alternative Fuel Use Increase Requirements Based on a FY 2005 Alternative Fuel Baseline of 100,000 GGE


To track compliance with the EISA Section 142 alternative fuel use increase requirements, Federal agencies are required to collect and report accurate annual vehicle fuel use data in FAST. These data will be used in FAST to automatically calculate annual compliance with the EISA Section 142 alternative fuel use increase requirements. Fleets must input annual vehicle data into FAST each year; the reporting period begins on roughly October 1 and closes in mid-December 15.

Agencies are required to collect and manage annual asset-level data (ALD) (per vehicle rather than aggregated fleet data) in a formal agency fleet management system, and submit relevant data managed in that system to FAST. Agencies must upload vehicle ALD from their fleet management system to FAST using a standardized file structure, which includes vehicle inventory, acquisition, cost, mileage and fuel use information for each vehicle. Agencies should ensure the required asset-level information in their fleet management system is finalized and reported to FAST well in advance of the mid-December deadline. Timely reporting will allow agency headquarters personnel ample opportunity to review the data for completeness and accuracy prior to final submission.