The tariff is higher becoz MR has to fill the pockets for continuous power supply. All premium services come at a cost, but great value for money. Imagine how much more you have to spend on purchasing, running and maintaining UPS, batteries, generators and the tension and headaches. Even the tariff is higher it is worth it.
But it is not a permanent solution, what if tomorrow MR opponents move the courts to end the discrimination and include Bahria Town in the load-shedding net.