There were some telling faces among the Brussels conference delegates. One was American wind energy pioneer Randy Tinkerman, who is back from a few years off the scene with a new company specialising in hydrogen production. Tinkerman praised his European colleagues for giving a "strong breath of sanity" and left them with a bit of advice: "European development should proceed with caution. It's scaling up rapidly to large machines. This will not be an easy or simple technological leap. Remember the strong lesson from the US: do not let the banks drive the engineering too fast." Tinkerman was making an oblique reference to the crash of Kenetech Windpower after a series of technology failures.