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Vējš savu spēku gūst no Saules, kas nevienmērīgi apsilda zemeslodi. Temperatūras atšķirības izraisa gaisa spiedienu atšķirības, kas savukārt izraisa gaisa masu kustību. Vēja enerģiju izmanto vēja elektrostaciju darbināšanai. Vēja enerģija ir viens no atjaunojamajiem enerģijas avotiem.
Lai arī tas ir tīrs un ekonomisks degvielas veids, vēja potenciāls ir acīmredzami nenovērtēts. Un ne tikai valstiskā līmenī, bet arī mājsaimniecībās. Ņemot vērā galvenokārt mazo patērētāju (ne lielos vēja parkus!), ir daudz iespēju alternatīvai enerģijas ražošanai.
Igaunijā gada vidējais vēja ātrums ir 4...5 m/ sek, pārsvarā pūš rietumu un dienvidaustrumu vēji un visvējainākais mēnesis ir decembris, kad vēja vidējais ātrums uz salām pārsniedz 7 m/ sek. Mums ir daudz īpaši perspektīvu vietu vēja enerģijas ražošanai, kur gada vidējais vēja ātrums ir 5...6 m/ sek!
