Tables and data files in the State Energy Data System (SEDS) supply a new year of data each production cycle. The latest data may be preliminary and, therefore, revised the following cycle. Changes made to production, consumption, and price source data for historical years are also regularly incorporated into SEDS.

Listed below are changes in SEDS content beyond the standard updates (beginning with the 2006 cycle). Only years with changes beyond the standard updates are shown.

Production

Renewable Energy

Fuel Ethanol
Fuel ethanol production is now disaggregated from renewable energy production. Estimates for 1981 forward are calculated using State-level data on production and production capacity and national-level data on production. Estimates of State-level biomass inputs to the production of fuel ethanol, in billion Btu, are also calculated.

Consumption, Prices, and Expenditures

Total Energy

Beginning in 1980, supplemental gaseous fuels, which are accounted for both in the fossil fuels from which they are derived and in natural gas, are removed once from total energy consumption for the residential, commercial, industrial, and electric power sectors to prevent double-counting. In addition, beginning in 1981, the industrial sector consumption includes energy losses and co-products from the production of fuel ethanol in the U.S. total. Individual State estimates are not available because reliable State allocators have not been identified.

Natural Gas

Natural gas consumption estimates in Btu are revised to include the small amount of supplemental gaseous fuels that are commingled with natural gas. Price and expenditure estimates are also based on this definition.

Nuclear

For 2007, nuclear fuel prices are computed using plant-level fuel cost and net generation data extracted from the Ventyx Velocity Suite.

Petroleum and Fuel Ethanol

Fuel Ethanol
The method for estimating fuel ethanol blended into motor gasoline by State is revised beginning in 2005. The State estimates are now based on several data series: (1) prime supplier sales of conventional and reformulated gasoline; (2) production of conventional and reformulated gasoline with and without alcohol; (3) a standard ethanol-to-motor-gasoline “blend ratio” of 10 percent for all States except California and Minnesota; and (4) estimated fuel ethanol “product supplied.” See Section 5 of the Consumption Technical Notes for detailed information.

Liquefied Petroleum Gases (LPG)
In 2000, the general sales tax rates were corrected in the computation of prices of LPG consumed by the industrial sector. For 2000, 2005, and 2006, the prices of LPG consumed by the petrochemical industry that are not available from the data source are now assigned the U.S. average price. 

Lubricants
The method of estimating U.S. lubricant prices described in Section 4 of the Price and Expenditure Technical Notes cannot be used for 2007, as the 2007 Economic Census data for lubricating oils and greases were not available when the lubricant data were processed. Instead, the 2007 U.S. lubricant price is estimated by applying the 2006-to-2007 growth rate of the composite refiner acquisition cost of crude oil, published in EIA Petroleum Supply Annual, to the 2006 price.

Motor Fuel Taxes
Corrections are incorporated in the average tax rates for motor gasoline and diesel from 2004 through 2006 and liquefied petroleum gases for 2004 and 2005, which causes revisions to the corresponding transportation, commercial, and industrial sector prices.

Production

Coal

The Btu conversion factors for coal production for some States are adjusted for all years to account for the production of metallurgical coal, which has a higher Btu content than steam coal used in electric power generation.

Natural Gas

The Btu conversion factors for natural gas extraction loss for 1970 through 1980 are revised using the same methodology employed for all other years.

Renewable Energy

Waste
The definition of waste is revised to exclude non-renewable waste (municipal solid waste from non-biogenic sources, and tire-derived fuels) beginning in 2001. Because this portion is mostly derived from fossil fuels, which are already accounted for, it is removed from total energy to eliminate the previous double counting. See article, “Methodology for Allocating Municipal Solid Waste to Biogenic and Non-Biogenic Energy,” on the Renewable & Alternative Fuels website under “Analyses.”

Consumption, Prices, and Expenditures

Natural Gas

Beginning in 1980, natural gas consumption in Btu is revised to remove supplemental gaseous fuels (SGF). Since SGF are mostly derived from fossil fuels, which are already accounted for, they are removed to eliminate double counting in total energy consumption. Price and expenditure estimates are also based on the new definition. Consumption estimates in physical units continue to include small amounts of SGF, as reported by the data source.

Petroleum

Distillate Fuel Oil
Beginning in 1997, the methodology for assigning a residential price estimate to a State without a price in the Petroleum Market Annual is simplified by assigning the State its corresponding Petroleum Administration Defense (PAD) district or subdistrict price.

Kerosene 
Kerosene consumed by all sectors for 1984 is revised to incorporate the use of unadjusted sales in the estimation methodology. The revised data are available in the EIA Petroleum Navigator but were not published in Petroleum Marketing Monthly.

Petroleum Coke
Beginning in 1993, State-level aluminum production capacity data, which are used as State allocators for petroleum coke use in the industrial sector other than refineries and combined-heat-and-power plants, have been adjusted to account for under-utilization of the plants.

Motor Fuel Taxes
Corrections were made to the average tax rates for motor gasoline and diesel for 2004 and 2005, and those for liquefied petroleum gas for 2002 through 2005. The corresponding transportation sector prices are revised. Commercial and industrial prices for motor gasoline, which are the same as those for the transportation sector, are also affected.

Renewable Energy

Fuel Ethanol
Fuel ethanol consumption is now allocated to the commercial, industrial, and transportation sectors using the motor gasoline consumption share for each sector. Previously, all fuel ethanol consumption was assigned to the transportation sector.

Waste
The definition of waste is revised to exclude non-renewable waste (municipal solid waste from non-biogenic sources, and tire-derived fuels) beginning in 2001. Because this portion is mostly derived from fossil fuels, which are already accounted for, it is removed from total energy to eliminate the previous double counting. See article, “Methodology for Allocating Municipal Solid Waste to Biogenic and Non-Biogenic Energy,” on the Renewable & Alternative Fuels website under “Analyses.”

Real and Nominal Gross Domestic Product by State

Real gross domestic product (GDP) by State (beginning in 1977), and nominal GDP by State (beginning in 1970), from the U.S. Department of Commerce, Bureau of Economic Analysis, are incorporated into SEDS for the first time. The real GDP data are used in SEDS to calculate total energy consumed per chained (2000) dollar of output by State. The nominal GDP data are used in SEDS to calculate total energy consumed per nominal dollar of output by state. The GDP data used in SEDS through 1996 are based on the Standard Industrial Classification (SIC), while the GDP data used in SEDS for 1997 forward are based on the North American Industry Classification System (NAICS). See the SEDS Technical Notes for more information on data sources, estimation procedures, and assumptions.