Biogas production and utilization is one project which has gone a long way not only in CALABARZON but in other areas of the country. Through the efforts of PSTC-Rizal, additional 22 biogas digesters were constructed in 2009 in Region IV. There are three newly operational digesters for Rizal, one newly renovated ; 12 in Batangas, six in Occidental Mindoro and one in Oriental Mindoro. Total project cost for the construction of digester was around P300,000.

To date, there are already 240 biogas digesters established through the assistance of DOST IVA. Project beneficiaries are LGUs, private farms and commercial hog raisers nationwide.