MANILA, Philippines - Meralco PowerGen Corp., the power generation arm of the country's largest power distributor, is in discussions for a $2-billion natural gas facility in the Philippines to be built together with a Japanese partner. On the sidelines of Metro Pacific Investments Corp.'s annual press briefing yesterday, MPIC and Meralco chairman Manuel V. Pangilinan said his group is currently in talks with Osaka Gas for the possible construction of a natural gas power plant which will have a generating capacity of between 1,200 to 1,500 megawatts (MW). "They (Osaka Gas) came over.