A public consultation on the long-term solution to tariffs paid under the non-domestic Renewable Heat Incentive (RHI) is to begin within the next three weeks.Legislation to cut RHI tariffs was approved by the NI Assembly in January 2017 after overspend from the scheme emerged. Tiered and capped tariffs were initially introduced for one year until a longer-term solution was found, but this was extended for another 12 months in March 2018.