Maentwrog hydroelectric plant is a hydroelectric plant in United Kingdom with a capacity of 30 MW, commissioned in 1928. It is operating and is owned by Nuclear Decommissioning Authority (United Kingdom).
Its owner, NUCLEAR DECOMMISSIONING LIMITED, is a single-asset company: its filed accounts to 2025-09-30 report fixed assets of — and net assets of £4,000.
Sources: asset record from Global Energy Monitor; financials filed by NUCLEAR DECOMMISSIONING LIMITED (company no. 11952605) with Companies House (Open Government Licence v3.0). All United Kingdom assets