Pakistan, despite having the sixth largest coal reserves in the world equivalent to 185.5 billion tons, has less than one percent share in Pakistan's power generation, compared with a world average of 40 percent. Thar coal can provide the cheapest power tariff in Pakistan after hydel, making it a preferred fuel source. An acceptable balance between the utilization of Thar lignite to its maximum while mitigating the environmental degradation is warranted. An environmentally smart technology selection model was developed which compares significant environmental, economic, technological and operational parameters and yields their impact on power tariff for four alternate plant configurations. Sub-critical, super-critical, ACFB, PFBC and IGCC combustion technologies, sorbent injection, spray dry scrubbers and wet scrubber technologies for SO2 removal, low NOx, selective non-catalytic and selective catalytic reduction technologies for NOx removal and electrostatic precipitators, and baghouse filters for particulate emission were contrasted. The parameters, which included efficiency, load range, load change rate, startup time, availability, technology maturity, suitability and complexity, available plant sizes, power consumption, emissions, waste production and disposal, capital and O&M cost were applied to alternate plant configurations to Thar coal mine mouth power generation plant at pre-combustion, combustion and post combustion stages, and their consequent impact on power tariff was calculated. The configurations that complied with World Bank and Pakistan EPA guidelines are recommended.