Despite significant catastrophe losses during the first half of 2010, including the Chilean earthquake, reinsurance rates continued to decline at the July 1, 2010 reinsurance renewal, according to a newly released report from Guy Carpenter.

The report found that U.S. property rates decreased by as much as 15 percent, with pricing for the year down 12 percent. Meanwhile, across the energy and casualty sectors, conditions were flat or down, though the Deepwater Horizon rig disaster has the potential to put upward pressure on rates.

Predictions of an active hurricane season have had only a slight impact on June and July renewals, with quoting behavior firmer than expected, but if the forecasts are right, there is a greater chance the marketplace will look very different at the January 1, 2011 renewal, Guy Carpenter said.

It went on to explain that while the Deepwater Horizon loss is potentially a market-changing event, it is geared principally towards energy and liability exposures. Reinsurers will be hard-pressed to justify rate increases for clients writing traditional marine cargo/hull accounts, it suggested.

Reinsurers’ quotes on international placements were unaffected by the Deepwater Horizon loss, as accounts were underwritten separately based on specific account losses and exposures.

However, marine excess of loss pricing is expected to increase substantially for reinsurance buyers with energy exposures. Increases of greater than 10 percent were seen for deepwater drilling risks similar to those of the Deepwater Horizon, Guy Carpenter said.

Check out I.I.I. background information on reinsurance.