The Department for the Economy says investment decisions were "beyond the bounds of the tariff".
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Conor Macauley
BBC NI Agriculture & Environment Correspondent
BBC News Renewable Heat Incentive Northern Ireland (RHI)
Parliament passes legislation for RHI cuts
Legislation making huge cuts to RHI boiler owners' payments clears its final hurdle in Westminster.
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Parliament passes legislation for RHI cuts
Legislation making huge cuts to RHI boiler owners' payments clears its final hurdle in Westminster.
RHI scheme could close or face big cuts
The Department for the Economy publishes results of a consultation on the future of the ill-fated green scheme.
RHI Inquiry: Day-by-day reports
Follow BBC News NI's day-by-day coverage of the public inquiry into the botched Renewable Heat Incentive.
RHI extension opposed 'to protect public'
Jonathan Bell denies opposing extension to the closure of the RHI scheme because it made him look foolish.
Bell was 'monster who had to be put to sleep'
Jonathan Bell is due appear at the RHI inquiry to give a second day of evidence later today.
Official 'does not recall' DUP spad RHI claim
Andrew McCormick says he would recall if DUP advisers said they did not want RHI raised at meetings.
Top DUP adviser 'involved in RHI cost delays'
Timothy Johnston is said to have told a colleague the controls would not be brought in, evidence reveals.
Featured Contents
Parliament passes legislation for RHI cuts
Legislation making huge cuts to RHI boiler owners' payments clears its final hurdle in Westminster.
RHI scheme could close or face big cuts
The Department for the Economy publishes results of a consultation on the future of the ill-fated green scheme.
RHI Inquiry: Day-by-day reports
Follow BBC News NI's day-by-day coverage of the public inquiry into the botched Renewable Heat Incentive.
RHI extension opposed 'to protect public'
Jonathan Bell denies opposing extension to the closure of the RHI scheme because it made him look foolish.
Bell was 'monster who had to be put to sleep'
Jonathan Bell is due appear at the RHI inquiry to give a second day of evidence later today.
Official 'does not recall' DUP spad RHI claim
Andrew McCormick says he would recall if DUP advisers said they did not want RHI raised at meetings.
Top DUP adviser 'involved in RHI cost delays'
Timothy Johnston is said to have told a colleague the controls would not be brought in, evidence reveals.
RHI scheme could close or face big cuts
The Department for the Economy publishes results of a consultation on the future of the ill-fated green scheme.
RHI Inquiry: Day-by-day reports
Follow BBC News NI's day-by-day coverage of the public inquiry into the botched Renewable Heat Incentive.
RHI extension opposed 'to protect public'
Jonathan Bell denies opposing extension to the closure of the RHI scheme because it made him look foolish.
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