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In order to assess the impact of power trade in the backdrop of falling Renewable Energy technology (RE) prices, we developed a power system model for each country in the South Asia BBIN sub-region (Bangladesh, Bhutan, India, and Nepal). High Trade and Low Trade scenarios are developed with unrestricted and restricted power trade possibilities respectively. Cost decline in RE increases Cross- Border Electricity Trade (CBET) from 13 TWh in 2019 to 976 TWh by 2050. The share of RE capacities in the total installed capacities for the region rises to 75% by 2050 under the High Scenario compared to 68% in the Low Scenario. Higher solar and wind mobilize more hydropower and reduce coal capacities and CO2 emissions. Thus, the electricity trade helps to reach higher utilization of power capacities and reduces costs and CO2 emissions, This material has been produced under the Climate Compatible Growth (CCG) programme. CCG brings together leading research organizations and is led out of the STEER centre, Loughborough University. CCG is funded by UK aid from the UK government. However, the views expressed herein do not necessarily reflect the UK government's official policies.