New York Times: When Imperium Renewables opened a plant in Washington state in 2007, it claimed to have built the largest biodiesel facility in the country. Now, like so many others in the biodiesel industry, Imerium`s plant sits idle. Its big tanks are leased out as a storage facility for biodiesel made elsewhere. I spoke earlier this week with John Plaza, Imperium’s founder. He has been through it all. Last year Imperium had to pull out of an initial public offering, and it lost a …