The European Commission on Wednesday opened investigations into two business groups bidding for a public contract to build and operate a solar panel plant in Romania. The probes “aim to preserve Europe’s economic security and competitiveness” in the strategically important solar panel sector, EU Internal Market Commissioner Thierry Breton said in a statement. The EU’s executive arm is investigating after preliminary checks found foreign subsidies may have helped the bidders unfairly compete for the contract. The first group under scrutiny involves LONGi Green Energy Technology Co., Ltd, a Chin…