You will pay for all projected solar electricity generation over a set duration (e.g. 20 years), locked in at a set rate per kWh. (energysage.com)
All that need be kept in mind is that wind and solar electricity generation runs independent of customer demand. (notrickszone.com)
The way they enact this program, so that the liable entities (the utilities) do not have to build this solar capacity themselves is to attach a Renewable Energy Credit (REC) to each MWH of solar electricity generation in the state. (solar-estimate.org)