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A 7.6 m diameter straight flow turbine was installed in an existing rockfill tidal dam at Annapolis Royal, Nova Scotia. Operation as an ebb-flow generator will yield 17.8 MW at heads of 5–6 m. Environmental consequences, and changes in design and operating mode, and remedial measures required to accommodate effects on agriculture and fish passage are outlined. The process of environmental impact assessment and integration is described and discussed.

The Annapolis Tidal Generating Station, i n service since August, 1984, was b u i l t t o demonstrate commercial operation of a large-diameter straight-flow turbine.The paper reviews experience to date relating t o performance, avai 1 abi 1 i ty and re1 i abi 1 i t y , hydraul i c seal s and auxiliaries, corrosion, marine fouling, and maintenance requirements.

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