Poland's Bank Ochrony Srodowiska (BOS) said on Monday it has acquired PLN 90 million (USD 22m/EUR 21m) worth of green bonds of Polish energy group Polenergia (<a href="https://www.gpw.pl/company-factsheet?isin=PLPLSEP00013" target="_blank">WSE:PEP</a>), thus supporting the development of offshore wind energy.