NACH-5632-EN - Cummins Power Generation

The Wayzata Bar & Grill. The liquor store is around the corner to the left.
Emergency Standby Power
Case History
Where:
Wayzata, Minnesota
What:
GGLB 150 kW natural gas
powered generator set
2 OTPC automatic transfer switches
PowerCommand® 2100 control
Distributor:
Cummins NPower, St. Paul, Minnesota
Application:
Provide standby power for Wayzata lift
station and municipal restaurant
Primary choice factors:
Previous successful experience with
Cummins Power Generation systems
Desire to have a single supplier for
easier service and support
City of Wayzata,
Minnesota, saves money
with a double-duty standby
generator set from Cummins
Power Generation
The village of Wayzata (pronounced
Why-ZETT-ah) enjoys a picturesque
location on the northeastern shore
of beautiful Lake Minnetonka, west
of Minneapolis. Like most towns it has
a sewer system with lift stations to carry
wastewater to treatment facilities.
Unlike most towns, it also has a
municipally owned restaurant and liquor
store, known affectionately to the
locals as The Muni, but officially known
as the Wayzata Bar & Grill and Wayzata
Wine & Spirits. These city entities share
an innovative solution for standby power.
CNA110067_WayzataMunicipal_CaseHistory 1
WAYZATA
MUNICIPAL CASE
HISTORY
2
2/22/13 12:04 PM
JOB # CNA110067
DATE 2.22.13
CLIENT
Cummins
NAME
Wayzata Municipal Pump Station Case History
TRIM
8.5" x 11"
BLEED
.125"
FOLDED
N/A
FILE CREATED AT
100%
COLOR C M Y K | PMS485
C
M
Y
K | 485
INITIALS
CD
Brien S.
AD/DS
Benson H.
CW
Don F.
AM
Christie G.
PM
Tamara M.
STAGE: FINAL
DATE
Background:
City redevelopment project
required bigger wastewater
lift station
A substantial redevelopment project in the town
was going to bring hundreds of new apartments,
additional office space and a small hotel. All of
that required an expanded wastewater system
with larger lift stations.
Mike Kelly, City Engineer for Wayzata, at the GGLB generator set.
One of the larger lift stations would handle
wastewater for about half the town. Reliable
standby power to run the station in the event
of a grid power outage was essential because
without power, wastewater would start backing
up into homes in 20 minutes. The city of Wayzata
does have a number of portable generators that
can be used to power lift stations. But having a
permanent emergency generator at this larger
lift station would save precious time and provide
peace of mind.
Partnering again
Wayzata already had several systems from
Cummins Power Generation, including one
providing standby power at its water treatment
plant. For the new lift station generator, the
city wanted to stay with Cummins for several
reasons. There would be just one company
to call for service. Continuing with the same
supplier would make it easier for city maintenance
staff to perform routine maintenance and
troubleshooting tasks. Systems from the same
company have similar designs and often use the
same replacement parts, even if they are different
models or sizes. And the city was happy with its
relationship with Cummins.
An innovative use
for extra generator capacity
discussions with Cummins NPower, the local
distributor, it was determined that a 150 kW
model would be the closest-size generator to
ensure adequate handling of the lift station load.
Then, inventive thinking on the part of city staff
led to the realization that the extra 25 kW of
capacity could be put to good use providing
standby power for the coolers and cash registers
at the city’s restaurant and wine shop, since
The Muni was located close to the site of the
new lift station. One generator set could thus
serve two different city functions at a lower total
cost of ownership. Doug Abrahamson, a sales
engineer with Cummins NPower, worked with city
engineering staff to develop the detailed 60-page
design specifications for the novel double-duty
backup system.
Smooth installation
The Model GGLB generator set and two separate
automatic transfer switches were installed in
December 2010 without any problems. The
generator runs on natural gas (it can also run
on propane). A 400-amp OTPC transfer switch
serves the lift station and a 125-amp OTPC
switch serves The Muni. A PowerCommand
2100 digital control handles monitoring, metering,
voltage regulation, digital governing and generator
set control functions for the entire system.
The city staff calculated that the new lift station
would need 125 kW of standby power to take
over in the event of a utility power outage. In
www.cumminspower.com
©2013 Cummins Power Generation
CNA110067_WayzataMunicipal_CaseHistory 2
2/22/13 12:04 PM
Saving money upfront and later
The innovative solution saved money on the
installation, since only one generator set had to be
purchased and installed. Fewer replacement parts
and less ongoing maintenance cost also reduce
total costs.
From left: The electrical service for the lift station, including the
automatic transfer switch, the electrical panel for nearby streetlights,
the generator set and another electrical service panel.
Mike Kelly, City Engineer for Wayzata, said,
“All the profits from The Muni go directly to
support city services. So it’s important for us to
keep expenses down. Using the same generator
system for both the lift station and The Muni is
a good example of how we can be smart with
needed expenditures and still get the emergency
protection we need.”
A positive emergency experience
The OTPC automatic transfer switch for the lift station.
The city has had to use the standby power
system only once, when utility power was lost
for four hours. The Cummins Power Generation
system performed exactly as desired: the critical
lift station continued to operate, and The Muni
was able to take care of existing customers during
the outage. “It was as good an experience
as we hoped for,” said Kelly.
“It was as good an experience
as we hoped for.”
— Mike Kelly, City Engineer
Mike Kelly at the OTPC automatic transfer switch for The Muni.
www.cumminspower.com
©2013 Cummins Power Generation.
All rights reserved. Cummins Power Generation
and Cummins are registered trademarks
of Cummins Inc. “Our energy working for you.™”
is a trademark of Cummins Power Generation.
NACH-5632-EN (02/13)
CNA110067_WayzataMunicipal_CaseHistory 3
2/22/13 12:04 PM