* Costs to amount to between 105-115 billion euros * Regulator must approve grid costs borne by consumers (Identifies and names proposals for two additional lines) FRANKFURT, Jan 29 (Reuters) - Germany may need to double its renewable energy capacity by 2035 as Europe’s biggest economy goes electric in heating, transport and other sectors, grid operators said on Friday. Presenting their capacity planning through to 2035, the four high voltage transmission grid firms (TSOs) said that Germany will need to have renewable power capacity of between 233 and 261 gigawatts (GW) by 2035, compared wi...