Six European Union countries, including Germany and the Netherlands, have warned that they cannot accept other member states' attempts to lower further the level at which the bloc will cap gas prices, according to an email seen by Reuters. The group, which also includes Austria, Denmark, Estonia and Luxembourg, laid out their red lines on the proposed EU-wide gas price cap, which countries are aiming to approve at a Dec. 13 meeting of energy ministers in Brussels. The European Commission last month proposed a price cap that would kick in if the front-month contract on the Dutch Title Transfer Facility exceeds 275 euros/MWh for two weeks and is also 58 euros higher than a Liquefied Natural Gas (LNG) reference price for 10 days.