Technology group Wärtsilä said it plans to introduce another four methanol engines to its portfolio. In addition to the Wärtsilä 32 methanol engine launched last year, Wärtsilä will add the Wärtsilä 20, Wärtsilä 31, Wärtsilä 46F and Wärtsilä 46TS, available for deliveries at different points from 2025 onward.