BEIJING, Oct 13 (Reuters) - China"s export growth unexpectedly accelerated in September, as solid global demand offset some of the pressure on factories from power shortages, supply bottlenecks and a resurgence of domestic COVID-19 cases. Outbound shipments in September jumped 28.1% from a year earlier, up from a 25.6% gain in August. Analysts polled by Reuters had forecast growth would ease to 21%. China"s imports rose 17.6%, lagging an expected 20% gain in a Reuters poll and 33.1% growth the previous month. Following is a breakdown of China"s exports and imports with its biggest trade partners in September. Sept Exports Imports Balance Exports Imports Exports Imports ($bln) ($bln) ($bln) +/- % +/- % y/y +/- % m/m +/- % m/m y/y Japan 14.4 18.1 -3.7 15.2% 5.5% 3.5% 8.3% South Korea 12.7 19.9 -7.2 27.9% 13.3% -3.9% 7.2% Taiwan 6.7 24.0 -17.2 26.6% 13.4% 1.1% 4.8% European 44.5 26.0 18.5 28.6% 1.1% -3.8% 2.8% Union USA 57.4 15.4 42.0 30.6% 16.6% 11.0% 9.7% Australia 6.0 15.0 -9.1 23.8% 50.7% 1.6% -17.0% ASEAN 40.4 36.2 4.2 17.3% 17.3% 2.2% 10.4% (Reporting by Stella Qiu and Ryan Woo; Editing by Amy Caren Daniel) Our Standards: The Thomson Reuters Trust Principles.