294 

 

 

ENERGY GENERATION & RECOVERY 

 

Indication of management commitment (e.g., standard operating procedures; board/executive 
management renewable energy conversion policy, including quantitative goals developed and shared with 
stakeholders)   

 

Internal energy sources evaluated (e.g., biogas, hydropower, heat in wastewater), and/or renewable 
energy sources evaluated on an ongoing basis (e.g., solar, wind, co-digestion)  

 

Recovery of digester gas in a combined heat and power (CHP) system, and boilers in place (for process 
and building heating)   

 

Conversion of digester biogas to electricity and heat, and/or transportation fuel Yes   

 

Solar panels, wind turbines, heat recovery, in conduit hydro, and/or hydroelectric power generation 
systems installed   

Additional Activity Descriptions (OPTIONAL) 
MCES management established a goal of advancing renewable energy in the Twin Cities metropolitan area 
equivalent to 10% of MCES fossil fuel based energy purchases in 2015 by 2020.   We are currently participating 
in solar photovoltaic projects that will generate about 10MW of solar energy on MCES-owned land.  Through a 
local government collaborative, MCES will be participating in about 6MW of solar energy generated on sites not 
owned by the Council.  

The Metro Plant produces steam from sludge incineration. Steam is used to generate electricity or provide heat 
to plant buildings. When the objective is power generation, a 4.7 MW condensing steam turbine is used and 
when the objective is building heat, the steam passes through a 0.83 MW non-condensing turbine generator, 
before being distributed throughout the plant.

 

MCES added anaerobic digestion at the Blue Lake Wastewater Treatment Plant in 2012. Digester gas replaces 9 
million BTU/hour of natural gas demand. 

Current project under design at the Empire Wastewater Treatment Plant to install a 1000 kW combined heat and 
power (CHP) engine.  The CHP engine will convert the plant’s digester gas to electricity (equivalent to 1/3 of the 
plant’s total power demand) and heat (equivalent to 40% of the plant’s heat demand).  
In Collaboration with a local district energy company, MCES is evaluating a neighborhood district energy/cooling 
system that recovers heat from sewage. 
Approximately 90% of biosolids are source of renewable energy (steam, electricity, biogas) 
 
In process of installing Combined Heat and Power generator to further utilize digester biogas 
 
 
 
Your Performance Measure(s) 

 
 
 
Your Results (quantitative or qualitative) 

MW renewable energy advancement in the 
region by MCES 

MCES is committed to participating in solar projects that will 
generate energy equivalent to about 10% of MCES total energy 
usage.   

MMBTU/yr of energy generation 

In 2015, MCES generated 61 MMBTU of energy from its turbines.  

 
 

 

WATER REUSE 

 

Board/executive management reuse strategy established 

 

Communications and outreach plan developed and implemented