There’s the FSP
I'll be happy to meet with you if you're ever interested. I'm about 15 mins from Concord and 30 mins from Manchester.
The closest really active group that I know of that is somewhat concerned around many of the same issues than Peak Prosperity is the Free State Project (google). It's a libertarian organization, so they tend to be rather ignorant/irrelevant about the environment, but they are very concerned about the economy and energy (although indirectly, they don't tend to believe in peak oil). They also share the survivalist attitude many in here do and are of course very concerned about our liberties. Just a thought.