Noble Energy's investments in West Africa began in the early 1990s and now represent a significant component of our international portfolio. Our production activities began with our 34 percent working interest in the Alba field, offshore Equatorial Guinea. In addition to natural gas and crude oil production, related operations include an LPG processing plant where liquids are recovered and a methanol plant. Recent exploration success on Block O and I is driving liquid production and cash flow increases for Noble Energy.
We are actively engaged in additional development programs offshore Equatorial Guinea, with operated working interests of 45 percent in Block O and 40 percent in Block I. We also have a 50 percent interest offshore Cameroon in the YoYo mining concession and Tilapia exploration block. Over the last few years, we have achieved tremendous exploration success in the region, discovering a combined 334 MMBoe, net to Noble Energy, in multiple oil and gas-condensate reservoirs.
In 2009, we sanctioned the Aseng oil project (formerly Benita) in Block I and brought it to production in November 2011, seven months ahead of schedule. The associated floating production, storage and offloading (FPSO) vessel, is capable of processing 80 MBbl/d of oil and 170 MMcf/d of natural gas. Alen, a condensate gas-cycling project (formerly known as Belinda) sanctioned in 2010, commenced production late in the second quarter of 2013 and is ramping to full operations. We are also progressing additional liquid discoveries and integrated gas monetization efforts for our natural gas discoveries.