We are considering installing gas storage onsite. This will have no major impact on the model, other than incurring an initial capital cost, replacement cost and yearly O&M costs. We have simulated this using a hydrogen tank. Unfortunately, with the ‘Multi-year’ enabled the hydrogen tank is not supported. Is there another way we can model this?  

From what I can see, there is an economics section to enter system fixed capital and O&M. Is there a way to input replacement costs in the model as well? 

Two ways to do this: 

1. Convert the replacement cost into an annual cost by dividing it by the number of years until replacement. That could go into the System Fixed O&M cost. Furthermore, they could discount it, as it is a future cost.   

2. Use a hydrokinetic generator with power output set to 0 kWh. Then add capital, replacement & O&M costs. You do not need to add a resource (like you would with a hydrogen tank) and can run for multiple years.