How would $800M in deductions cover $2.3B income to the tune of a 0% tax rate? Wouldn't they still be on the hook to pay taxes on $1.5B or is it not that simple?
EDIT: Oh, apparently tax credits aren't pre-tax. So if their tax liabilities on $2.3B were $300M then they'd owe $0.
$2.3 billion was the income, not the tax bill.
Presumably $500M accelerated depreciation and $300M of tax credits covered the effective tax bill on $2.3B income.