...Tokyo Gas Co., Ltd.'s (Tokyo Gas) A1 ratings reflect its strong market position in liquefied natural gas (LNG) transportation and distribution in the greater Tokyo area, Japan's (A1 stable) largest metropolitan area, which encompasses Tokyo, with a solid earnings base from its gas utility business, a regulated pipeline business, and business opportunities from the deregulated electric utility sector. At the same time, the deregulation of the Japanese gas retail market has made revenues less predictable, leading the company to seek diversification and growth in non-utilities businesses. In addition, the growing investments needed to meet the company's decarbonization goals make it hard for it to reduce debt, and raise its execution risks over time....