modular bladder raisable wall and turbine combinations that may be employed in an existing dam bladders are labeled 51 similar to those illustrated in fig3 while turbine and generator combination are labeled 25 similar to those in fig1 also similar to fig1 dam wall 35 is shown turbine and generator combinations 25 are positioned to receive head power from the existing dam but have placed on top of them an additional head producing wall 21 fig6 shows a cross section view of fig5 taken along line 6 6 and illustrates that wall 21 is raisable in this embodiment with bladder 51 as previously described to create additional head the power generating cell depicted in fig5 and 6 may be preexisting within a dam structure or added to an existing dam fig7 shows a series of bladders 51 and walls 21 that may be moveable and placed in various positions with fixed turbine and generator combinations 25 or in combination with moveable turbine and generator cells depending on the circumstances any combination of power generating cell and raisable wall may be employed depending on the existing dam the terrain or flow characteristics of the body of water as shown in fig7 the inflatable bladder module may be inserted in different positions among the turbine generator cells in alternative embodiments the turbine and generator cells may also be moveable and configured with moveable.