During the two years that followed, two new boilers were installed (numbers 3 and 4) which, along with 5 and 6, exceeded the output that the old generators from the original Tejo Power Station could withstand.
W kolejnych dwóch latach zamontowano dwa nowe kotły (numer 3 i 4), które, razem z 5 i 6, miały większą moc niż stare generatory pierwotnej elektrowni.