Duke Energy Florida 8-K Other Events

Nuclear Electric Insurance Limited (NEIL)

As of May 31, 2011

$214

($103)

($46)

$65

$375

($67)

$146

($162)

($M)

($M)

Deductible:

$10 million

Insurance limits

Primary:

$500 million

Excess:

$1.75 billion

Total:

$2.25 billion

Deductible:

12 weeks

Insurance limits

52 weeks:

$4.5 million per week

71 weeks:

$3.6 million per week

Total:

$490 million (thru Aug-12)

1

Repair Costs

Replacement Power Costs

EXHIBIT 99.1