据日本放送协会NHK：日本制钢计划到2029财年总投资约8,680亿日元，用于引进电炉。

Group 1 - The core point of the article is that Nippon Steel plans to invest approximately 868 billion yen by the fiscal year 2029 to introduce electric furnaces [1] Group 2 - The investment is aimed at modernizing production processes and enhancing efficiency in steel manufacturing [1] - The introduction of electric furnaces is expected to align with global trends towards more sustainable and environmentally friendly production methods [1] - This strategic move may position Nippon Steel competitively in the evolving steel industry landscape [1]