SB Energy is the U.S. renewable energy development subsidiary of SoftBank Group, the Japanese technology and investment conglomerate led by Masayoshi Son. Established in 2018 to deploy capital from SoftBank's Vision Fund into U.S. clean energy infrastructure, SB Energy develops, builds, and operates utility-scale solar and battery storage projects across the United States. The company has grown to over 2 gigawatts of operating capacity and maintains a development pipeline exceeding 10 gigawatts.
SB Energy operates as a wholly owned subsidiary of SoftBank Group, giving it access to SoftBank's global investment network and balance sheet — a significant advantage in securing project financing and navigating the capital-intensive development process. Unlike many independent developers who must raise external equity for each project, SB Energy benefits from a well-capitalized parent willing to take a long-term view on clean energy infrastructure returns.
SoftBank Group's foray into clean energy reflects Masayoshi Son's long-standing personal conviction that renewable energy — particularly solar — would become the dominant and lowest-cost source of electricity globally. Son has spoken publicly for over a decade about solar's transformative potential and was an early advocate for large-scale solar development in Japan following the Fukushima nuclear disaster in 2011, when he lobbied aggressively for Japan's feed-in tariff program.
The U.S. push through SB Energy is part of a broader SoftBank clean energy strategy that spans Asia, where the company has also invested in large-scale solar and wind projects in India (through SB Energy India, which was sold to Adani Green Energy in 2021) and has explored a massive "Asia Super Grid" concept connecting renewable resources across the continent. In the United States, SB Energy focuses on markets where merchant solar and storage economics are most attractive and where data center demand from SoftBank's technology portfolio investments concentrates.
SB Energy's U.S. portfolio is concentrated in ERCOT (Texas), MISO (Midwest), and CAISO (California) — the three largest wholesale electricity markets with the most active solar and storage development activity. The company has developed large-scale solar projects in Texas and Indiana, with battery storage co-location becoming an increasingly important element of new project designs.
SB Energy's projects are typically sold to utilities, cooperatives, and corporate buyers under long-term power purchase agreements. The company has secured PPAs with Microsoft, Toyota, and other large commercial and industrial energy buyers seeking to meet renewable energy procurement goals. SB Energy's affiliation with SoftBank's portfolio of technology companies — which includes significant investments in AI infrastructure, data centers, and semiconductors — positions it as a natural supplier to SoftBank-affiliated entities with growing clean energy needs.
In 2021, SoftBank sold its Indian renewable energy subsidiary — SB Energy India — to Adani Green Energy for approximately $3.5 billion. At the time of the sale, SB Energy India had approximately 1.4 gigawatts of operating capacity and 4.9 gigawatts of contracted capacity under development, making it one of India's largest independent solar developers. The transaction crystallized significant returns for SoftBank's Vision Fund and allowed the company to redeploy capital into its U.S. operations.
The India sale demonstrated SoftBank's willingness to monetize clean energy assets at the right price and recycle capital into new development opportunities — a model that may inform the eventual strategic path for SB Energy's U.S. platform as its operating asset base grows and matures.
SB Energy's growth strategy is closely tied to the surge in U.S. electricity demand driven by data centers and AI infrastructure — a sector where SoftBank has made some of its largest investments, including a $100 billion U.S. investment pledge announced by Masayoshi Son in late 2024 focused heavily on AI and energy infrastructure. The company is well-positioned to serve the clean energy needs of SoftBank's broader investment portfolio, creating a potential captive offtake channel that independent developers lack.
The Inflation Reduction Act significantly improved U.S. solar and storage economics for SB Energy's project pipeline. The company is actively expanding its pipeline through greenfield development and opportunistic acquisitions of early-stage projects, targeting positions in interconnection queues across ERCOT, MISO, and PJM where near-term capacity additions will be needed to serve load growth.
SB Energy's primary risk is parent dependency — its financial strength, strategic direction, and capital access are entirely contingent on SoftBank Group's priorities and financial condition. SoftBank has historically been willing to significantly restructure or exit investments when its overall balance sheet comes under pressure, as demonstrated during the 2020–2022 period when Vision Fund losses led to aggressive portfolio monetization. A shift in SoftBank's investment thesis or financial condition could materially affect SB Energy's capital availability and development ambitions.
As a private company with a well-capitalized parent, SB Energy provides minimal public financial disclosure. Its project pipeline figures, returns on deployed capital, and balance sheet leverage are not publicly available. The company's long-term trajectory — whether it pursues a public listing, asset monetizations similar to the India sale, or remains a wholly owned infrastructure platform — is unclear.
This profile was compiled from publicly available information including:
SB Energy corporate website — Company overview, project portfolio, and press releases.
SoftBank Group annual reports and investor presentations referencing clean energy investments.
Industry reporting on SB Energy's U.S. project development activity and the SB Energy India — Adani Green transaction.
This profile is for informational purposes only and does not constitute investment advice, a recommendation, or a solicitation to buy or sell any security.