TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: The method (M1) further comprises: producing 1-8C oxygenate from the electrocatalytically reducing the hydrocarbonaceous source; electrocatalytically electrolyzing water in a second fuel cell to produce hydrogen and providing the hydrogen produced in the second fuel cell to the first fuel cell; and reacting a portion of fuel composition to produce energy. The temperature of the first fuel cell is 25-90 degrees C during the electrocatalytic oxidizing of the hydrogen source and the electrocatalytic reducing of the hydrocarbonaceous source. The pressure of the first fuel cell is 0.1-0.7 MPa during the reducing of the hydrocarbonaceous source. In the method (M1) electrical energy is provided during an off-peak time, where the electrical energy is stored as chemical energy in the fuel composition. Preferred Components: The electrical energy is provided from a renewable source comprising an agricultural source, geothermal source, hydroelectric source, solar source, tidal source and/or wind source. In the energy storage system: the second fuel cell is a hydrogen fuel cell configured to provide the hydrogen to the first fuel cell from electrolysis of water; and the catalyst is platinum, palladium and/or rhenium disposed on a support and the support is silica-alumina, zirconium phosphate and/or carbon. In the energy source the second fuel cell is a hydrogen fuel cell configured to provide the hydrogen to the first fuel cell from electrolysis of water, and the carbohydrate is a 4-8C monosaccharide and/or 4-8C sugar alcohol.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The second catalyst comprises a metal disposed on a support comprising Bronsted acid site. The metal comprises cobalt, chromium, iron, iridium, molybdenum, nickel, osmium, palladium, platinum, rhenium, rhodium, ruthenium, tin and/or tungsten. The support comprises carbon, silica, alumina or zirconium phosphate (all preferred), zeolite, zirconia, titania, hafnia, zinc oxide, copper oxide, magnesium oxide, iron oxide and/or magnesia. The second catalyst: is platinum on zirconium phosphate, platinum on silica-alumina and/or platinum-rhenium on carbon; and comprises 4-20 wt.% platinum. The first catalyst comprises a metal comprising cobalt, chromium, iron, iridium, nickel, palladium platinum, rhenium, rhodium, ruthenium, osmium and/or tin.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The step of electrocatalytic reducing hydrocarbonaceous source produces fuel composition with 55% efficiency where hydrogen is used as the hydrogen source, and 10% efficiency where water is used as the hydrogen source. Preferred Components: The hydrocarbonaceous source is: gas or liquid; a biomass-derived compound, a compound comprising hydroxy and/or compound comprising ether, preferably bio-oil, carbohydrate, carboxylic acid, cellulose, furan, furfural, furfural alcohol, hemicellulose, lignin and/or their derivatives; water-soluble at a temperature of at least 5 degrees C; and is present at 0.1-50 wt.% in a solution. The carbohydrate is a monosaccharide, disaccharide, polysaccharide, sugar alcohol, starch and/or their derivatives, preferably fructose, glucose and/or xylose. The solution has a weight hour space velocity of 0.1-1000 hour-1 in the first fuel cell. The hydrocarbon fuel composition is gas or liquid, comprises a 1-8C hydrocarbon, has a research octane number of 80-100. The hydrocarbon fuel product comprises methane, ethane, propane, butane, pentane, hexane, heptane and/or octane. The hydrogen source is: gas or liquid; or hydrogen, water and/or 1-6C alcohol. EXAMPLE - No suitable example given.