Debt-heavy Pengrowth Energy Corp. is in talks to sell approximately $500-million in Alberta oil and gas assets to Infor Acquisition Corp., the latest sign of financial companies stepping up for energy assets, according to people familiar with the matter. Story Fairfax Financial Holdings Ltd. is preparing a bid to acquire New Zealand-based insurance company Tower Ltd. in a deal valued at about $140-million , according to people familiar with the sale process.