Biofuels firm Imperium seeks $345 million IPO

Imperium Renewables expects to complete in July its Grays Harbor refining plant, capable of producing 100 million gallons of biodiesel annually.

Imperium Renewables, the Seattle-based biodiesel company building a large refinery in Grays Harbor, wants to raise up to $345 million from a public stock offering to finance a major expansion into the fast-growing alternative-energy market.

By Benjamin J. Romano

Seattle Times technology reporter

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