During the Spanish Civil War he was a combatant in the republican army.
After the war he left his job as an accountant for the study Estudios Chamartín, where he participated in the creation of several short films. In 1947 he began collaborating with Editorial Bruguera, for which he created
Don Pío (1947), Calixto (1947),
Gordito Relleno (1948) and
Don Berrinche (1948, about a man who was always angry). He was involved in several magazines of the publisher, especially
At this time, he worked with his friends Cifré and Escobar in a rented studio. They liked to catch red pine mushrooms in autumn and joke about it among themselves.
In 1957, together with these and other cartoonist of Bruguera, Carlos Conti and
Eugenio Giner, he created an independent company that began publishing a new journal,
Tío Vivo, keeping the typical schemes of Bruguera magazines. For this magazine, Peñarroya draw new characters, such as La familia Pi (very similar to his Don Pío) After the economic failure of Tío Vivo, he returned to Bruguera, for which continued creating characters, such as Floripondia Piripí (1958),
Pepe, el hincha (1962, about a fanatic of a very unlucky soccer team),
Pitagorín (1966, about a kind and gifted child) and Rudesindo el bucanero (1966). He also created new series for the magazine "Tele Chico".