The policy's closure will have a disproportionate impact on Scotland, according to Scottish Renewables.
The assessment reveals the Government's decision could increase the UK's carbon emissions by 63 million tonnes.
The Impact Assessment was published as part of a suite of documents for the new Energy Bill.
It counts the costs and benefits of the early closure of the Renewables Obligation, despite government still not having published the grace periods for projects that should fall outwith the scope of this policy.
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The assessment shows:
• Lifetime CO2 emissions could be up to 63MtCO2e, higher than they would otherwise have been.
• Under the central estimate, total lost benefit to communities would be around £1m a year.
• Under the central estimate, there would be around a £0.30 (0.05%) reduction on the average annual household electricity bill.
Michael Rieley, Senior Policy Manager at Scottish Renewables, said: "We have consistently argued that this policy can only hinder the UK's efforts to meet binding climate change targets, and the government has now admitted their decision could increase the UK's carbon emissions by 63 million tonnes."
"The decision to close support for onshore wind has caused a ripple effect of uncertainty throughout the renewables industry, removes one million pounds a year from local communities and may only end up saving 30 pence on the annual household electricity bill."
Mr Rieley added: "What we need now is for the UK Government to set out fair and reasonable grace periods as soon as possible for those projects that will fall outwith the scope of this decision."
(LM)
