Here is the description from the NPS, and it is exactly as described:
No electricity, landline phone, or cell phone service is available in Tuolumne Meadows for the rest of the winter due to weather-related damage. If staying at the ski hut, you'll need your own stove, fuel, and light source.
The Tuolumne Meadows Ski Hut is now open for the winter season until the Tioga Road opens to traffic in the spring (usually sometime in May or early June). It sleeps 10 and is available at no charge on a first-come, first-served basis. Parties should always be prepared to camp out in case the hut is full, which happens on occasion, particularly in the spring.
The ski hut is the stone building facing the Tioga Road just west of the bridge across the Tuolumne River and right at the entrance to the Tuolumne Meadows Campground (in the summer, the building is the campground reservations office). It is approximately eight miles west of Tioga Pass, and sits at about 8,600 feet in elevation. A wooden sign out front indicates "SKI HUT."
The hut has a wood stove for heat, firewood is provided, and an axe is available for splitting wood. There are electric lights and electric hotplates for cooking—unless the power goes out, a not-too-unusual occurrence. An outhouse is located behind the hut and a dumpster for trash is located at the summer store just to the west. Snow will need to be melted for water and pots are provided for that purpose. Bring your own pans and stove for cooking. A large rodent-proof can is provided for storing food while staying in the hut.
The closest route to Tuolumne Meadows is a 16-mile ski up Highway 120 (closed to vehicles this time of the year) just outside the town of Lee Vining, and over 10,000 foot Tioga Pass—a one- or two-day trip under good skiing conditions, but possibly a much longer trip after heavy snowfalls. Numerous other backcountry ski routes of varying length and difficulty exist to access the Tuolumne Meadows area.