TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Microorganism: In the electrogenic microorganism host cell (C1), each heterologous electrogenic pathway gene encodes an electrogenic pathway protein or its portion. The microorganism is a bacterium from the genera Geobacter, Shewanella or Escherichia coli strain (preferably BL21 strain cell, especially DE3 strain cell). The microorganism comprises at least one of the Shewanella oneidensis MR-1 gene selected from MtrB, MtrC, MtrD, MtrE, MtrF and/or OmcA; and/or at least one of the Geobacter gene selected from OmcS and/or OmcZ. The microorganism (C1) further comprises the Shewanella oneidensis MR-1 gene MtrA. Recombinant Methods (claimed): The method for obtaining the electrogenic microorganism (C1), involves: expressing in a host cell at least one of the Shewanella oneidensis MR-1 gene selected from MtrB, MtrC, MtrD, MtrE, MtrF and/or OmcA, and/or at least one of the Geobacter gene selected from OmcS and/or OmcZ. The expressing involves transforming the host cell with a nucleotide comprising a polynucleotide sequence of at least one gene selected from MtrB, MtrC, MtrD, MtrE, MtrF, OmcA, OmcS and/or OmcZ; which involves transforming the host cell with the expression vector pOmcA, pACYCOmcA, pACYCMtrDEF and/or pACYCMR-1 (preferably expression vector pACYCOmcA, pACYCMtrDEF and/or pACYCMR-1). The method further involves expressing in the host cell the Shewanella oneidensis MR-1 gene MtrA. The method involves a step of confirming that the host cell (C1) is an electrogenic microorganism after expressing at least one gene in the cell by using the host cell (C1) in a microbial fuel cell and determining that the power density obtainable in the microbial fuel cell is greater than the power density obtainable in a microbial fuel cell comprising an equivalent host cell not comprising the at least one gene. EXAMPLE - Cloning and Expression of Shewanella oneidensis MR-1 gene was carried out as follows. The decahaem outer membrane c-type cytochrome OmcA gene having defined sequence containing 2208 base pairs (SEQ ID NO:1) as given in the specification from S. oneidensis MR-1 was inserted into pUNI-PROM vector that allowed for constitutive expression from tat promoter, to form construct pOmcA. The cytochrome maturation genes were considered essential for expression of cytochrome and so plasmid pEC86 was used, carrying genes that encode for cytochrome c maturation (Ccm) proteins. The constructs were transformed into BL21 (DE3) E. coli cells. For expression of cytochrome maturation genes and OmcA, cells were taken from selective antibiotic agar plate and transferred to 100 ml liquid culture of Luria Bertani (LB) media. This was done with final concentration of 20 mu g/ml chloramphenicol (Cm), and 40 mu g/ml ampicillin (Amp), and left for 16 hours at 37 degrees C, with agitation at a rate of 180 rpm. The dense culture (1 ml) was then used to inoculate fresh 100 ml of LB with Cm and Amp at same concentrations. This culture was held at 37 degrees C, 180 rpm for 16 hours and 30 ml of this culture was tested in microbial fuel cell (MFCs). The plasmid chosen for expression was pACYCDuet-1 since it had T7 promoter and therefore tightly regulated expression, as well as two Multiple Cloning Sites (MCSs). The sites chosen for insertion of gene fragments into pACYCDuet-1 were the AscI and NotI sites present within MCS1. The genes were cloned into plasmid using T4 DNA ligase and transformed into E. coli DH5 alpha cells. The cells were plated out onto 20 mu g/ml Cm LB agar plates. The DNA collected from positive colonies was transformed into BL21 DE3 to allow for expression of proteins within isopropyl ~ beta -D-1-thiogalactopyranoside (IPTG) inducible strain. Single colonies were picked off plates and transferred into 100 ml LB media with 20 mu g/ml Cm and left at 37 degrees C, 180 rpm for 16 hours. The developed culture (1 ml) was taken and used to inoculate 100 ml of LB media, again with same antibiotics and left at 37 degrees C, 180 rpm until it reached an OD 600 of 0.4. Once culture reached this point it was induced using 1 mM IPTG and left for further 12 hours at 37 degrees C, 180 rpm to allow culture to fully develop. Microbial fuel cells comprising transformed cell cultures were then formed as follows. A single colony of transformed BL21 DE3 strain was taken and added to 10 ml LB plus 20 mu g/ml Cm and 40 mu g/ml Amp in 50 ml falcon tube. This was put in shaking incubator at 37 degrees C, 180 rpm for 16 hours. This culture (1 ml) was taken and added to fresh 10 ml of LB with same concentration of antibiotics and allowed to grow for 16 hours under same conditions as starter culture. Alternatively, if IPTG was used for induction, 1 ml of the first culture was taken and added to fresh 100 ml of LB with same concentration of antibiotics and allowed to grow until OD600 of 0.5 was achieved under same conditions as the starter culture. At this point, IPTG was added to culture to give final concentration of 0.5 mM and flask was moved to 25 degrees C, 150 rpm overnight. Next day, OD600 of all cultures was noted, using LB as blank and culture was spun down at 2800 rpm for 10 minutes. The supernatant was removed and culture was gently re-suspended in fresh LB to OD600 of 5. MFC device was constructed by using pure carbon fiber veil cut into 2x 10 mm oblongs with total surface area of 200 mm2. A Nafion (RTM: proton exchange membrane with carbon and platinum cathode side) (PEM) was used. Both anode and cathode sections had 1 mm x 2 mm section of copper tape attached to provide conductive appendage for attachment to interface and resistance box and then data acquisition device. The OD600 5 culture (200 mu l) was then extracted using 1 ml syringe and injected into MFC device and into anode chamber. The device was connected to resistance box by attaching crocodile clips to conductive copper tape of each compartment. The data acquisition began as soon as clips were attached with resistance set at 33 M Omega until samples had stabilized. The resistance of samples was then decreased every 500 seconds in following increments with readings noted before each change: 33, 15, 5, 2, or 1 M Omega , and 470, 200 and 100 K Omega . The maximum power density was calculated. This provided more information than voltage output as it allowed resistance at which greatest power output was achieved. The point of external resistance at which this occurred was equal to internal resistance of MFC. An increase in power density in MFC of 23% (mW/m2) or 600% ( mu A.m-2) as compared to untransformed BL21 DE3 cells was observed. These demonstrated that electrogenic behavior could be engineered in non-electrogenic cell and provided electrogenic E. coli which could be readily studied, manipulated and used industrially.