In brief, the CFOR mandates that a minimum number of retail fueling stations provide a designated alternative fuel, for a given number of vehicles using that fuel. The station count mandate does not apply until the statewide number of vehicles utilizing a fuel is at least 20,000 vehicles. Station count estimates apply to a compliance year, defined as the May 1st through April 30th period, and are defined no later than 14 months prior to the start of the compliance year.
Applicable fuels are determined by the Executive Officer of the California Air Resource Board, by review of Department of Motor Vehicle records, and projected production volumes included by manufacturers in their vehicle emissions certification data. For each designated fuel, a fleet size estimate is calculated, according to the following formula:
Number
of
Vehicles
|
=
|
(Projected Sales for Corresponding Model Year
+
Sales for Previous Model Year)
|
+
|
Sales Two Model Years Prior
|
+
|
Total Vehicles Using the Fuel, Registered with the DMV as of July 30th, Two Years Prior
|
2
|
6
|
Provided an estimate of at least 20,000 vehicles, the process continues to determination of the Total Projected Maximum Volume (TPMV), essentially, an estimate of maximum demand for the alternative fuel.
The TPMV is determined as the sum of the Maximum Demand Volumes (MXDV), which are calculated separately for each model year and vehicle class. Model years considered are 1994 through the model year corresponding to the compliance year for which station count numbers are being calculated. Vehicle classes considered are passenger cars, light-duty trucks, and medium-duty vehicles. TPMV and MXDV are measured in gasoline-equivalent gallons per year for liquid fuels and in therms per year, for gaseous fuels.
For a given fuel, vehicle class and model year, the MXDV is calculated as the number of vehicles within that class and model year, using that fuel, multiplied by the average annual vehicle miles traveled of that group, with this product divided by the average fuel economy of that group. Thus, for a given fuel type, the TPMV is given by the expression on the following page.
Where:
TMPV = Total Projected Maximum Volume
PC = Passenger Cars
LDT = Light-Duty Trucks
MDV = Medium-Duty Vehicles
MY = Model Year, for model years 1994 through the model year corresponding with the relevant compliance year.
AVMT = Average Vehicle Miles Traveled for a vehicle class and model year
AFE = Average Fuel Economy for a vehicle class and model year
The number of required fuel outlets is calculated from TPMV.
Required Fuel Outlets
|
=
|
TPMV
|
-
|
Discounted Fuel Volume for Fleet Vehicles
|
+
|
Total Fuel Volume
from Vehicle Conversions
|
Fuel Throughput Volume per Station
|
As fleet vehicles are presumed to perform a majority of their refueling at a central, fleet location, a share of the fuel volume which fleet vehicles would require is removed from consideration. Likewise, in determining whether the 20,000 vehicle threshold has been reached, the same share of fleet vehicles is ignored. The share of fleet vehicles removed from consideration is determined by the Executive Officer of the California Air Resource Board, and is intended to represent the portion of fleet fueling performed at fleet stations. The CFOR specifies that no more than 75 percent of fleet vehicles shall be removed.
For liquid fuels, the Fuel Throughput Volume per Station is assumed to be 300,000 gasoline equivalent gallons per year, until the number of vehicles using that fuel is high enough that the CFOR requires more than 5 percent of all retail gasoline outlets to stock the fuel. At this point, the assumed Fuel Throughput Volume per Station is 600,000 GGEs. For fuels dispensed as a gas (e.g., CNG), the Fuel Throughput Volume per Station is instead a constant 400,000 therms, or 456,000 GGEs.195
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