NOVELTY - An isolated Geobacter strain capable of effective utilization of an organic compound selected from pyruvate and 3-12C metabolic precursors of pyruvate as an electron donor, and having a functional mutation in a gene encoding a repressor of an enzyme of the tricarboxylic acid cycle, is new.    USE - The strain and methods are useful for improving electricity production of microbial fuel cell, where the microbial fuel cell is used to power environmental sensors, electronic devices or electric vehicles; generating electrical power at waste facility; improving in situ bioremediation of contaminated site; and for making isolated adapted strain of electricigenic microbe that can use alternative organic compound as electron donor, where the alternative organic compound is not preferably used as electron donor by parent strain of the electricigenic microbe (all claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a method of improving electricity production of a microbial fuel cell comprising providing a fuel cell comprising an anode connected to a cathode through a conductive connection, and further connected to a load; providing an anodophilic Geobacter strain that can use an organic compound selected pyruvate and 3-12C metabolic precursors of pyruvate as an electron donor; and providing the corresponding organic compound, where the oxidation of the organic compound by the Geobacter strain results in improved generation of electricity in the fuel cell; (2) a method of generating electrical power at a waste facility comprising providing a waste compartment enclosing an anode, the anode being connected to a cathode through a conductive connection, and further connected to a load for power generation at the waste facility; providing an isolated anodophilic Geobacter strain capable of effective utilization of an organic compound selected from pyruvate and 3-12C metabolic precursors of pyruvate, and adding to the waste compartment the Geobacter strain and a amount of a waste product located at the waste facility, the waste product comprising the selected organic compound, where the organic compound selected from pyruvate and 3-12C metabolic precursors of pyruvate in the waste product is oxidized by the Geobacter strain, thus generating electrical power at the waste facility; (3) a method of improving in situ bioremediation of a contaminated site comprising providing an anode and a cathode in the soil at a location in the contaminated site, where the anode and a cathode are each connected to the respect terminals of an electrical supply; adding to the soil of the location at least a sufficient amount of an organic compound selected from lactic acid, its salts, lactate esters, poly-lactate, or mixtures thereof for use as an electron donor for a contaminant found in the groundwater or soil of the location; adding an isolated Geobacter strain capable of effective utilization of lactate as an electron donor to the soil of the location, where the strain is added optionally before, after, or during the addition of the organic compound, where the Geobacter strain uses the added organic compound as an electron donor for reduction of the contaminant as the electron acceptor, thus improving in situ bioremediation of the contaminated site; (4) a method of making an isolated adapted strain of an electricigenic microbe that can use an alternative organic compound as an electron donor where the alternative organic compound is not preferably used as an electron donor by a parent strain of the electricigenic microbe, comprising: (a) providing a first vessel that contains a first culture, the first culture comprising the parent strain of the electricigenic microbe, and a first growth medium that includes a preferred organic compound as an electron donor and a corresponding electron acceptor; (b) inoculating a second vessel that contains a second growth medium that includes an alternative organic compound that replaces the preferred organic compound as an electron donor and a corresponding electron acceptor with an aliquot of the parent strain of the electricigenic microbe to form a adapted culture; (c) monitoring a growth rate of the adapted culture, noting the start of the exponential phase, and continuing until the growth rate is in mid or late exponential phase; (d) setting n=1, where n is an integer from 1 to 100, inclusive; (e) n=n+1; (f) transferring an aliquot of the adapted culture to another vessel that contains the second growth medium to inoculate a nth adapted culture; (g) monitoring the growth rate of the nth adapted culture, noting the start of the exponential phase, and continuing until the growth rate is in mid or late exponential phase; (h) repeating steps (e)-(g) unless either the time period from inoculation until the start of the exponential phase of the nth adapted culture is more than 0.4 x the time period from inoculation until the start of the exponential phase of the n-1 adapted culture; or the increase in the growth rate of the nth adapted culture compared to its predecessor is less than that of the n-1 adapted culture compared to its predecessor, or the doubling time of the nth adapted culture in the second growth medium is greater than or equal to the doubling time of the parent strain in the first growth medium; and (i) isolating the adapted strain of the electricigenic microbe from the nth adapted culture; and (5) an adapted strain of Geobacter sulfurreducens produced by the method, where the strain is identified as strain ZMS-253, ZMS-353, or strain ZMS-453.