I like the concept of green energy mining. I think Accelerator could really take off if mining on their site was really profitable. If they break even on the cost of setting up the facility, and can build their own electricity generators, either solar or hydro, then all mining for them is free. Maybe if trading ACC was to bid to be first in line to mine, but mining was really profitable, like 2-5x.
One of the advantages of mining is finding new coins that have a low hashrate. Maybe you could pay a small amount of ACC to have any coin you want added, with their custom pools and wallets. For example you could add pegascoin, achilles coin, or bismuth.