Great — here are top eco-friendly hotels across Sri Lanka (mix of proven conservation projects, strong renewable‑energy/waste programs, and community‑focused operations). I’ve listed the standout green features and a source for each so you can check details and current availability.

1. Jetwing Vil Uyana (near Sigiriya) — large wetland restoration project, biodiversity/research programs (loris conservation), extensive solar and water‑reuse systems; built to regenerate habitat rather than replace it. (jetwinghotels.com)

2. Heritance Kandalama (Dambulla) — iconic biophilic design that integrates with the escarpment and forest, long history of onsite recycling/education programs and community projects (paper from elephant dung, forest sanctuary). (cntraveler.com)

3. Jetwing Kaduruketha (Wellawaya / agro‑eco resort) — agro‑ecology/regenerative farming, native crop revival, low‑impact construction and community livelihood programs. (Part of Jetwing’s wider sustainability program.) (dailymirror.lk)

4. Jetwing Yala (Yala region) — big on renewable energy (large PV installations), onsite glass bottling to cut plastic, organic gardens and waste‑to‑energy/biogas practices. Good option for combining wildlife with measured sustainability credentials. (jetwinghotels.com)

5. Wild Coast Tented Lodge / Wild Coast (Resplendent Ceylon, Yala) — tented eco‑architecture, solar power supplying a large share of energy, greywater reuse and biogas from food waste, active conservation/community initiatives (leopard research). (lanka.guide)

6. Chena Huts by Uga Escapes (Yala) — small boutique huts built to blend into the landscape, onsite organic gardens, solar and LED energy measures, community projects and Travelife/other sustainable hospitality practices reported. (purebreaks.com)

7. Cape Weligama / Resplendent Ceylon properties (south coast) — several properties in this group have zero‑waste and marine plastic initiatives, community programs and renewable‑energy measures (good coastal eco options). (outlooktraveller.com)

Quick tips when choosing:

• Look for recent sustainability reports or third‑party certifications (EarthCheck, Green Globe, Travelife) on the hotel’s website before booking. (jetwinghotels.com)
• Prefer properties with measurable actions: on‑site renewable energy, water‑reuse/greywater systems, waste processing (compost/biogas), and clear community/conservation programs. (ceylontoday.lk)
• If wildlife viewing is a priority, check how the property manages tours (ethical viewing rules, limits on vehicle numbers/times) to avoid supporting harmful practices. (euronews.com)

If you want, I can:

• Narrow these by region (south coast, Yala, cultural triangle, hill country), price range, or travel dates.
• Check current sustainability certifications or latest guest reviews for 2–3 properties you’re most interested in.