Proposed Boiler MACT rule definition of “Energy Assessment:”

X. Energy Assessment:

i. Energy Assessment for facilities using 0.04 to 0.3 TBtu/year –

Includes activities undertaken to identify energy performance 

improvements in a system. This assessment shall consider a subset 

of the major components and functions of the energy supply and 

energy use system in the facility, including:

1. steam – boiler combustion management

2. boiler thermal energy recovery

3. condensate recovery

4. insulation improvements

5. steam trap improvements

ii. Energy Assessment for facilities using 0.3 to 1 TBtu/year –

Includes activities undertaken to identify energy performance 

improvements in a system. This assessment shall consider the 

components and functions in Xi, in addition to a large subset, but 

not necessarily all, of the major components and functions of the 

energy supply and energy use system in the facility, including key 

portions of the total steam or process heating systems in the 

facility.

iii. Energy Assessment for facilities using greater than 1 TBtu/year –

Includes activities undertaken to identify energy performance 

improvements in a system. This assessment shall consider all of 

the major components and functions of the energy supply and 

energy use system in the plant, including using the processes 

identified in the ASME steam and process heating standards.

Proposed Boiler MACT rule definition of “Qualified Energy Assessor:”

Y. Qualified Energy Assessor:

i. Qualified Energy Assessor to conduct an Energy Assessment for 

facilities using 0.04 to 0.3 TBtu/year – Qualified Energy Assessor 

for facilities using 0.04 to 0.3 TBtu/year shall have demonstrated 

capabilities to evaluate a limited set of the typical energy savings 

opportunities available in opportunity areas for steam and process 

heating systems, including, but not limited to: 

a. Boiler combustion management

b. Boiler thermal energy recovery

1. Conventional feedwater economizer

2. Conventional combustion air preheater

3. Condensing economizer

c. Boiler blowdown thermal energy recovery

d. Primary energy resource selection

1. Fuel (primary energy source) switching, 

2. Applied steam energy versus direct fired energy 

versus electricity
e. Insulation issues

f. Steam trap and steam leak management

g. Condensate recovery

h. Steam end-use management

Capabilities and knowledge includes, but is not limited to:

a. background, experience, and recognized abilities to 

perform the assessment activities, data analysis, and report 

preparation

b. familiarity with operating and maintenance practices for 

steam or process heating systems

ii. Qualified Energy Assessor to conduct an Energy Assessment for 

facilities using 0.3 to 1 TBtu/year – Qualified Energy Assessor 

for facilities using 0.3 to 1 TBtu/year shall have demonstrated 

capabilities in Yi, in addition but not limited to, evaluating a set of 

the typical energy savings opportunities available in opportunity 

areas for steam and process heating systems, including:

a. those opportunities evaluated for facilities using less than 

0.3 TBtu/year

b. additional potential steam system improvement 

opportunities including improving steam turbine operations 

and reducing steam demand

c. additional process heating system opportunities including 

effective utilization of waste heat and use of proper process 

heating methods

d. boiler-steam turbine cogeneration systems, 

e. gas turbine-heat recovery steam generation cogeneration 

systems

f. industry specific steam end-use systems

Capabilities and knowledge as defined in Yi.

iii. Qualified Energy Assessor to conduct an Energy Assessment for 

facilities using greater than 1 TBtu/year – Qualified Energy 

Assessor for facilities using 1 TBtu/year or greater shall have

demonstrated the capabilities in Yi and Yii, and also shall have 

demonstrated capabilities to perform a full assessment of energy 

savings opportunities available in opportunity areas for steam and 

process heating systems, technical expertise and tools to estimate 

cost and energy savings steam and process heating systems. 

Capabilities and knowledge as defined in Yi, in addition but not 

limited to, experience applying a systems approach in performing 

assessments.