In its role, the manager will assume investment and portfolio management responsibilities, focusing on a set of immediate priorities, along with enabling the board and advisers to undertake and complete a comprehensive review of options for the company's future.
Current manager ThomasLloyd Global Asset Management, which this week lost a vote to oust the board, will help facilitate an orderly handover of information and responsibilities.
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The new manager brings a range of experience across solar and other renewable energy generation assets globally, including based in India and other Asian markets.
It will aim to offer "effective oversight" of the existing operating portfolio, including the construction of RUMS and the development of a solar project in Maharashtra, India.
The manager will also finalise the 31 December 2022 and 30 June 2023 valuations, 2022 audit and accounts and 2023 interim report, along with lifting the trust's share suspension as soon as possible.
The board aims to provide an expected timeline for these priorities "as soon as practicable" following the finalisation of the manager's appointment.
Octopus Energy Generation currently manages around £6bn AUM and oversees four investment vehicles classified as Article 9.
For its services, the manager will be paid a fixed fee of $1.35m, with an additional discretionary performance fee of up to $550,000.
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Sue Inglis, chair of ThomasLloyd Energy Impact, said: "The appointment of Octopus Energy Generation brings significant renewable energy infrastructure development, construction, investment and asset management expertise and listed investment company experience.
"These skills and knowledge, together with the strength and depth of the Octopus Energy Generation team immediately available to the company, will be critical in achieving the company's immediate priorities and enabling the lifting of the suspension in trading of the company's shares."
Co-head of Octopus Energy Generation's fund management team Matt Setchell added: "Being selected as the transitional investment manager is testament to our deep expertise in managing renewable energy projects globally.
"There is huge potential to make a truly positive impact through investing in green energy projects in Asia. Our teams in London and Singapore are ready to help the company achieve its immediate priorities thereby allowing it to resume its mission to accelerate the green energy transition and meet net zero."