Dealing with craziness is tricky.
One thing that is your friend is statistics. If there is any info out there that can counteract his claims. It will take a while but people trust statistics (to pay bills I work part time as a research scientist and can use statistics "effectively"). For instance, exploding wind turbines - "Oh really, xyz source showed that "my brand" wind turbines had a better safety record and lower failure rate than "his brand" wind turbines." Or "That is surprising since "my brand turbines" have the best safety or longevity or whatever rating of any wind turbine according to this "reputable" source." The potential customer is going to be impressed by the stats and probably tell other people.
You don't have a signature with a website (perhaps you don't have enough posts). If you don't have one get one pronto. Scoring well in local search will bypass your competitor for the many people who do a web search when interested in a product. Load your site with sourced stats.
With a website to get a better quality score try to get inbound links and "expert status". Think about writing for other websites. Two places to start are HARO (help a reporter out) and Blogger Link Up.
From the Blogger Link UP most recent email
"3) Alternative Energy Blog wants your content! Green? AltEnergy?
Industry insights? We want em!
Name: Kevin Rockwell
Blog or Website URL: http://www.alternativeenergyhq.com
Email: [email protected]
Oour post rules are that the content need s to be 350 words or
longer, the content is about the Alternative Energy field (solar,
wind,bio diesel, wave,carbon credits,hybrid cars, electric cars,geo
thermal,hydrogen fuel, bio fuels). We welcome industry experts and
we conduct interviews. We allow up to two links in the lost back to
your URL. Images are welcome.
Previously published OK?: Yes"