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Much of the time it will refer to revenue generated on an annual basis.

For example, all wind energy companies might spend $1T this year as an investment, but only bring in $10B in revenue. That would be a $10B market.

But manufacturing and installing wind turbines would be $1T/year revenue, since that's where their investment goes.

$1T in manufacturing not in power generation which is the more important and relevant part of the equation.

That would be $1T in cumulative revenue, not $1T/year of revenue.

It is a large number. But it's a different large number from the headline.