Sustainable Development Capital LLP

Jonathan Maxwell, CEO and Founding Partner, leads the firm alongside a management team that includes Head of Investments and Head of Listed Funds. Investment decisions for SEEIT are made by SDCL's investment committee, which Maxwell chairs. Per the firm's website, the committee includes senior partners with backgrounds in infrastructure and credit.

SDCL focuses on energy-efficiency upgrades, distributed generation (solar, combined heat and power), and energy-storage projects. Typical ticket sizes range from £5M to £50M per project, with targeted internal rates of return in the mid-teens for private debt and lower double-digits for direct equity, per 2023 investor materials.

The firm originates proprietary deals through direct relationships with building owners, local governments, and industrial operators who need capital to execute energy retrofits. Founded by a former infrastructure banker, the firm also partners with energy service companies (ESCOs) that deliver projects and share upside. SDCL does not rely on auction processes for the majority of its deals.

SEEIT is a UK Investment Company listed on the London Stock Exchange (ticker: SEIT). It invests exclusively in energy-efficiency and distributed-energy assets, largely through long-term debt and equity positions in project special purpose vehicles. The structure allows investors to trade shares on exchange while the underlying portfolio holds illiquid infrastructure assets with multi-year cash yields.

Yes. SDCL has co-invested alongside UK and European pension funds in specific project SPVs, and SEEIT itself has participated in club deals. The firm states it typically takes operational control of co-invested assets, acting as lead investor and asset manager. Its proprietary sourcing gives it lead rights in many transactions.

SDCL is not a family office; it is an independent asset management firm. Capital comes from institutional investors including public pension funds, insurance companies, and high-net-worth individuals via SEEIT. The founding partners' own capital is co-invested, per the firm's marketing materials, but the firm does not manage a single-family or multi-family pool.

SDCL publicly states that energy-efficiency investments generate both measurable carbon reduction (verified by project-level monitoring) and contractual cash yields. The firm does not claim impact-first status; its stated investment objective for SEEIT is to generate a total return with long-term, inflation-linked income. The positive environmental outcome is treated as an attractive co-benefit rather than a concession.