We assume that the cost starts a US$ .21 per KWh, which is the value used in the US-EIA study, and then declines at a decreasing rate over time to reach US$ .13 per KWh in 2025. We use the cost curve for “Conventional Coal” from the US-EIA study for both natural gas and oil costs. The cost of “Conventional Coal” is used as the indicator cost for all coal production.