ECMPS Support

When using the LTFF methodology to determine heat input, the MHHI indicator should be "Y" for any hour in which a fuel is combusted that cannot be measured using a long-term fuel flow system. In those hours, the hourly heat input will be based upon the unit’s maximum-rated heat input rate.

There are two situations where this may occur:

-- For fuels that are normally measured using tank drop measurements, it may be impossible to obtain an accurate tank drop measurement because the unit operated for a very short time or used a very limited amount of fuel.

-- For secondary fuels that are not measured by a long-term fuel flow system.

If either situation might ever apply, it is also necessary to define a Substitute Data Code of MHHI in the HIT method record in the monitoring plan.