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The report also states a separate analysis by Alberta Finance shows the methane policy could scrap 1,000 jobs across the province.

The government rejects both estimates.

The briefing note also puts a steep price tag on the province’s plans to impose its carbon tax on large industrial greenhouse gas emitters.

This system of credits, formally called output-based allocations, could cost the energy sector $1.3 billion a year, beginning in 2018, the document states.

However, government officials said Tuesday total costs for all industries will fall well short of that level.

United Conservative Party MLA Don MacIntyre said the changes would deliver another hit to the Alberta oilpatch as it faces ongoing competitiveness pressures.

“Don’t treat environmental standards as a cash cow, and that’s what this government is doing,” MacIntyre said.

“This is simply another hammer blow, (on) a series of hammer blows.”

The NDP government says the data ignores several key policy measures the province has been working on with industry for months to phase-in the new emissions rules, provide investment to spur innovation by companies, and to protect trade-exposed industries.

Government officials peg the total compliance cost to all industrial sectors from the output-based allocation system at $874 million in 2018-19, rising to almost $1.2 billion two years later.

Environment Minister Shannon Phillips said she hadn’t seen the leaked note, but said the data is “quite outdated and contains inaccurate information.”