OSLO (Reuters) – Swedish utility Vattenfall posted a 21% drop in first-quarter operating profits as grid congestion negatively impacted power prices, the company said on Friday. Underlying earnings before interest and tax (EBIT) fell to 9.5 billion Swedish crowns ($968.2 million) from 12.1 billion crowns in the first quarter of 2021. “Vattenfall’s results came in lower than last year as transmission bottlenecks continued to exert a major negative impact on achieved prices,” the company said. Net profit for the January-March period fell to 6.1 billion Swedish crowns from 10.4 billion crowns a y…