autoconsumir

To consume something one has produced oneself — most common in energy and agriculture: la casa autoconsume la energía que genera con sus paneles solares. Also used, less often, for a system consuming itself, e.g. eroding its own resources.

• La casa autoconsume gran parte de la energía solar que genera. — The house self-consumes most of the solar energy it generates.
• El huerto familiar autoconsume casi toda su producción de verduras. — The family garden consumes almost all of its own vegetable production.
• La industria corre el riesgo de autoconsumirse si no diversifica. — The industry risks consuming itself if it doesn't diversify.

Using autoconsumir for ordinary consumption of store-bought goods — it specifically means consuming what you produced yourself, a distinction that matters in energy and farming contexts.