Adding concise background to the sentence: The Finnish paper, packaging, and forest products company, Stora Enso Oyj, announced a significant investment today.

Identifying key sentiment signals: The company's decision to invest EUR 137 million in building a power plant at its Ostroleka facility reflects confidence and optimism in future growth and sustainability.

Synthesizing enhanced sentence: Stora Enso Oyj (OMX: STERV) revealed today its plan to invest EUR 137 million (USD 176.6 m) in the construction of a new power plant at its Ostroleka facility, demonstrating a strong commitment to future expansion and environmental stewardship.