Agree that proprietary chargers inside the parks are probably a no go, and SCs probably don't belong there in any case. SCs belong in the gateway towns outside the parks, i.e. West Yellowstone/Gallatin/Jackson/Moran/Groveland/El Portal/Lee Vining etc., with the highest possible amperage J1772s (commensurate with the electrical system limitations) usable by all inside.
I proposed, designed, spec'd and installed a PV lighting system in the Yosemite backcountry a couple of decades back, and had to deal with five separate park departments to do it, not including the concessionaire, so rapid response to proposals isn't to be expected. I started writing a proposal to install EVSEs inside Yosemite a couple of years ago, but decided to hold off submitting it as I thought it was still premature - short range BEVs were a poor choice to get there and lacked en route infrastructure, PHEVs didn't really need them (although running on electricity rather than gas inside the park is desirable; use of the hold button while outside the park en route is recommended), and Tesla had yet to put any SCs within easy range (Manteca will _partly_ solve this), so I've been holding on to it for a riper opportunity.
With Manteca soon to go live and longer range affordable BEVs (hopefully) appearing in the next two years with (hopefully) appropriate QC infrastructure at least between the Bay Area and the park, it may soon be time to install a modest number of pay J1772s in addition to the single free Clipper Creek that's now available in the Yosemite Village parking lot. Per Plugshare it's apparently regularly used by an employee's Volt, but he's happy to let you disconnect him if you need a charge.
Anyway, leaving aside the cover letter/executive summary explaining the rationale for more EVSEs for the benefit of the DNC at Yosemite President and the Park Superintendent (NPS is the permitting authority and has the final say on any changes in the park), here was a first draft of possible locations. Comments are welcome:
Option #1: Initial, lowest cost option.
Allow Level 1 charging from currently existing 120V/15A receptacles. Receptacles should be chosen which have no other load on the same circuit, and which allow the EV to park in such a way that no cords extend across pathways or through wet areas, for safety and liability reasons (see App.A, Link #3). Charging can either be free or preferably at a low flat rate (window sticker/hang tag etc. with expiration date to show payment) and should be available to all, not just hotel guests. there should be a minimum of two receptacles in each location. Such receptacles should be available in 3 general areas:
Yosemite Valley: Ahwanee, Yosemite Lodge, Curry Village, possibly Housekeeping camp and Yosemite Village.
Tuolumne Meadows: Tuolumne Lodge, probably Store/Gas station area for the Campground also.
Wawona: Wawona Hotel, Store/Gas station area, possibly the Pioneer History Center.
Option #2: Initial, dedicated pay L1/2 EVSEs plus Option #1 receptacles where L1/2 can't be afforded. Chargers should allow reserving in advance, and as above there should be at least two in each location, with maximum time limits on each EVSE. 4 areas:
Yosemite Valley: same locations as Option #1 but definitely including a pair of EVSEs in Yosemite Village parking. EVSEs at Curry Village and Yosemite Lodge parking lots should be located as close as possible to the Pines and Camp 4 campgrounds, respectively, to facilitate charging by people staying in those campgrounds.
Tuolumne Meadows: Same locations as Option #1, plus the Visitor center, Wilderness Permit center, Dog Lake/JMT trailhead lot.
Wawona: Same locations as Option #1, plus possibly the Campground, Mariposa Grove parking lot.
Crane Flat Gas station* and/or Big Oak Flat Entrance Station, possibly Tuolumne Grove parking lot.
Option #3: First Expansion: Multiple dedicated L1/2 EVSEs in all locations above, plus L3 Quick chargers at Crane Flat* and possibly Wawona and El Portal. Add L2 EVSEs at Glacier Point.
Option #4: Full Expansion: Multiple dedicated L1/2 EVSEs at all above locations, all park campgrounds/parking lots where power is currently available and people are likely to spend at least 30 minutes, including Lower Yosemite Falls, Tioga Pass, White Wolf.
* I did some on the ground recon of possible locations along Tioga road two years ago, and found that the Crane Flat gas station gets its electricity from a big diesel genset, so consider it ruled out. One possibility might be PV panels in the Tuolumne Grove parking lot, perhaps something like this:
Here Now: The World's First Portable, Self-Contained Solar EV Charging Station | PluginCars.com
so it can be moved for winter. It wasn't clear to me how the Yosemite Institute facility in Crane Flat gets its power, but if they are tied to the grid then possibly EVSEs can be put there.