ric ▁power ▁an ▁absolute ▁priority , ▁as ▁was ▁standard ising ▁electric ity ▁in ▁the ▁country ▁through ▁a ▁national ▁transport ▁network . ▁For ▁those ▁reasons , ▁since ▁ 1 9 5 0 ▁the ▁Te jo ▁Power ▁Station ▁was ▁class ified ▁as ▁a ▁reserve ▁power ▁station , ▁occup ying ▁a ▁secondary ▁position ▁to ▁support ▁the ▁electric ▁power ▁production ▁sector , ▁in ev it ably ▁beginning ▁its ▁decl ine . ▁ ▁Indeed , ▁on ▁ 2 1 ▁January ▁ 1 9 5 1 ▁the ▁Cast elo ▁do ▁B ode ▁Power ▁Station ▁was ▁officially ▁inaugur ated , ▁the ▁first ▁of ▁several ▁large ▁scale ▁hydro elect ric ▁power ▁plants ▁that ▁the ▁National ▁Elect r ification ▁Law ▁established ▁in ▁its ▁project ▁to ▁supply ▁electric ▁power ▁to ▁the ▁large ▁consumption ▁cent res , ▁such ▁as ▁Lis bon ▁and ▁Porto . ▁From ▁that ▁moment ▁on , ▁the ▁Te jo ▁Power ▁Station ▁became ▁a ▁reserve ▁plant , ▁limit ing ▁its ▁operation ▁to ▁years ▁of ▁dr ought ▁or ▁complicated ▁water ▁situations , ▁and ▁as ▁a ▁support ▁system ▁for ▁the ▁national ▁electric ▁grid . ▁However , ▁it ▁continued ▁to ▁produce ▁power , ▁although ▁operating ▁only ▁one ▁tur bo ▁set ▁and ▁two ▁high ▁pressure ▁bo ilers . ▁ ▁From ▁ 1 9 5 1 ▁to ▁ 1 9 6 8 , ▁it ▁worked ▁every ▁year ▁except ▁in ▁ 1 9 6 1 . ▁ 1 9 5 3 ▁was ▁an ▁especially ▁difficult ▁year ▁due ▁to ▁a ▁lack ▁of ▁water ▁supply , ▁which ▁meant ▁the ▁Te jo ▁Power ▁Station ▁had ▁to ▁work ▁for ▁almost ▁the ▁entire