1592953596000 1312632483000 term-59812 1616541270557 1312632554000 1616290121713 adlib fitz-online adlib-term-59812 7663fbf4-83dc-3247-9b10-87e851462ba4 2 1 thermal gradient power plants, ocean thermal gradient power plants, ocean term reference term-59815 adlib-term-59815 7e1f51c5-8496-34d1-927c-c9d2a9ed6dc3 ocean thermal energy conversion plants