Private hydropower schemes are "on a cliff edge" in Wales due to a decision to withdraw business rate relief for some projects from April, according to the British Hydropower Association.
It wants the Welsh government to follow Scotland's example where the rate relief scheme was extended until 2032.
In Wales, it is estimated it would cost less than £500,000 a year.
The Welsh government said over half of Wales' energy needs were met through renewable sources.
It said this included a 2% contribution from 363 hydropower projects, and it had "no evidence of any projects ceasing to operate due to unsustainable costs".
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