| Sandane Kommune |
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| Savon Voima Oyj |
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| SCA Graphic Sundsvall AB |
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| Scalar Energy AS |
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| Scandem Oy |
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| Scandinavia Energy System AB |
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| Scanenergi A/S |
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| Scener, OÜ |
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| Scener, SIA |
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| Scholt Energy Trading B.V. |
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|
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| Scottish Power Energy Management Ltd. |
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| SEFE Marketing & Trading Limited |
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| SFE Produksjon AS |
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| Shell Energy |
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| Shell Energy Europe Limited |
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| SIA "AJ Power" |
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| SIA Alexela |
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| SIA "IMLITEX LATVIJA" |
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| SIA "Willbrook Management" |
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| Sira-Kvina Kraftselskap |
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| Skagerak Energitjenester AS |
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| Skagerak Kraft AS |
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| Skara Kommun |
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| Skellefteå Kraft AB |
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| SKS Handel AS |
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| Skövde Kommun |
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| Slim met Energie BV | NieuweStroom |
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| SMART@ENERGY BV |
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| SmartestEnergy Limited |
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| Smart el i Sverige AB |
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