CapacityControl (Power TAC factored customer 1.7.0 API)

```
public interface CapacityControl
```
Support for balancing market interactions between DU and customers/brokers.

Author:

John Collins

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`exerciseBalancingControl(BalancingOrder order, double kwh, double payment)`	Creates BalancingControlEvent, posts it on correct TariffSubscription instances.
`RegulationAccumulator`	`getRegulationCapacity(BalancingOrder order)`	Gathers up power usage data for the current timeslot that could be subject to a BalancingOrder.
`void`	`postEconomicControl(EconomicControlEvent event)`	Posts an EconomicControlEvent on the correct TariffSubscription instances.

- Method Detail
  - exerciseBalancingControl
```
void exerciseBalancingControl(BalancingOrder order,
                              double kwh,
                              double payment)
```
    Creates BalancingControlEvent, posts it on correct TariffSubscription instances. Up-regulation is represented by positive kwh (the market is getting more energy) and typically positive payment.
  - getRegulationCapacity
```
RegulationAccumulator getRegulationCapacity(BalancingOrder order)
```
    Gathers up power usage data for the current timeslot that could be subject to a BalancingOrder. Return value is in kwh.
  - postEconomicControl
```
void postEconomicControl(EconomicControlEvent event)
```
    Posts an EconomicControlEvent on the correct TariffSubscription instances.