I would lean towards this for "Windenergieanlagen". "Anlage" is frequently translated as "plant" in a technical context, and certainly, there are some quite good search engine hits for this phrase.

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Note added at 7 mins (2003-08-12 04:52:14 GMT)
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Hmm, a rather interesting result from the Laixicon technical dictionary:

http://www.tecnologix.net/laixicon/

It renders \"Windenergieanlage\" as \"wind energy CONVERTER\".

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Note added at 9 mins (2003-08-12 04:54:12 GMT)
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Just looked up \"Windkraftanlage\" in Laixicon. It offers two suggestions: \"windmill\" (so I suppose you could say \"wind turbine\" in this context) and \"wind energy converter\" again.

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Note added at 13 mins (2003-08-12 04:58:15 GMT)
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Then there\'s this entry from Eurodicautom:

\"Subject Electrical Engineering - Electronics (EL)
Mechanical Engineering (MG)


(1)
TERM Windkraftanlage

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE
(2)
TERM Windturbine

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE
(3)
TERM Windenergieanlage

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE
(4)
ABBREV WEA

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE
(5)
TERM Windmühle

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE
(6)
TERM Windmotor

Reference Ernst;v.König,p.180;BMFT,P.59;VDI-Statusbericht,p.87

Note {NTE} WINDENERGIE


(1)
TERM wind turbine

Reference Webster;Sharing the Sun,Vo.7,p.191

Note {NTE} WIND ENERGY
(2)
TERM wind engine

Reference Webster;Sharing the Sun,Vo.7,p.191

Note {NTE} WIND ENERGY
(3)
TERM wind motor

Reference Webster;Sharing the Sun,Vo.7,p.191

Note {NTE} WIND ENERGY\"

What both Eurodicautom and Laixicon show is that \"Windkraftanlage\" and \"Windenergieanlage\" are pretty well synonymous. Both basically mean \"wind turbine\", I think. But if you want to distinguish between them, maybe call one a \"wind turbine\" and the other a \"wind energy converter\" or \"wind engine\" - something like that.