Turkmenistan isn't big on tourism. They don't grant tourist visas to anyone unless you have a guide, and they usually don't grant visas for October, when their independence day is (as one travel agency in Ashgabat claimed: "a lot of foreign dignitaries come to honor us, and we need to have high security). The crater is in the middle of nowhere and there's virtually no tourist infrastructure surrounding it.
Energy efficiency really isn't a concern there, as they are a major gas exporter and hugely subsidized gas is used to placate the public. Household utilities used to be free and every person/vehicle would have a generous quota of free gas, with over-quota gas still being extremely cheap (it was 6 cents per liter when I was there), though this is changing.