See post about adjusting the axes YRuler and XRuler properties.
ax = gca;
ax.YRuler.Exponent = 0;
Your code:
%%%%Price in every part of the components of the facility
Panels=230000;
Batteries=123000;
MPP=15000;
Maintenance=116000;
OtherExpenses=73000;
Transformer=4000;
c = categorical({'Panels','Batteries','MPP','Maintenance','OtherExpenses'});
X = [Panels,Batteries,MPP,Maintenance,OtherExpenses];
%%%subplot one
ax1 = subplot(1,2,1);
p1=bar(ax1,c,X);
title(ax1,'PV facility cost (models B&C)');
ax1.YRuler.Exponent = 0; %ADD THIS !!!
%%%%subplot two
c1 = categorical({'Batteries','Transformer','Maintenance','OtherExpenses'});
Y = [Batteries,Transformer,Maintenance,OtherExpenses];
ax2 = subplot(1,2,2);
p2=bar(ax2,c1,Y);
title(ax2,'Fossil facility cost (model A)');
ax2.YRuler.Exponent = 0; %ADD THIS !!!
