Intense negotiations have concluded between the promoters of embattled renewable energy company Solar 21 and legal representatives of brokers and investors in the business that will give them a “greater return” worth up to €23 million more than originally offered. A letter sent on Wednesday by solicitors Crowley Millar to about 40 brokers it represents reveals the breakthrough between Solar 21, led by Michael Bradley, and representatives of investors. Both sides were locked in talks in order to agree a scheme of arrangement to try and return capital to investors who have put €240 million into the solar energy company…