Get our free book (in Spanish or English) on rainwater now - To Catch the Rain.

RCEA energy audit reviews/Coast Central Credit Union

From Appropedia
Jump to: navigation, search
Engr115 Page in Progress
Warning: Possibly Inaccurate Content
This page is currently being edited by students in Engr115 Intro to Engineering. The content should be considered inaccurate until this message is removed. Please refrain from making edits before December 22, 2009 unless you are a part of this class. Feel free to make comments using the discussion tab.

Coast Central Credit Union

 The Coast Central Credit Union is a financial institution in Eureka and the surrounding areas. Coast Central Credit Union has 19 ATMS and 11 member service branches throughout Humboldt County, and the Eureka branch worked with Redwood Coast Energy Authority (RCEA) in getting light retrofits for the building which over time have saved money and CO2 emissions. (this last sentencce is what you should be focusing onin the introduction.  What is the purpose of THIS page W.11) 

Redwood Coast Energy Authority

The Redwood Coast Energy Authority' mission statement says: "The Redwood Coast Energy Authority’s (RCEA) purpose is to develop and implement sustainable energy initiatives that reduce energy demand, increase energy efficiency, and advance the use of clean, efficient and renewable resources available in the region" taken from the RCEA webpage. (Plagarism.  Should be in quotes.  -10). All of RCEA’s funding comes from contracts and grants, bringing resources to Humboldt County that would not otherwise be available.  The RCEA currently has projects to retrofit local businesses' office lighting in Northern Humboldt county(CT5).[1]

The Retrofit

In April 2008 the RCEA retrofitted the Coast Central Credit Union's (CCCU) office space lighting and replaced the existing lights with brighter and more energy efficient light fixtures in the office.(CT6)


The installation cost for the light upgrade made by RCEA was $2,176.19 After an instant rebate of $919.86 given for working with RCEA(where was the money from originally?), the Coast Central Credit Union ended paying $1,256.33 for the retrofit.

Estimated Savings from the Retrofits

The RCEA estimated that the Coast Central Credit Union would benefit in the following ways: (redundant in table.  keep table.  You should list this information first.  What was expect then what actually happened) 

  • They would save $797.70 per year
  • Their CO2 emissions reduced by 2,487 lbs/year
  • They would reduce energy use by 4,784 kWh/year
  • They would reduce power use by 1.854 kW

Retrofit Outcomes

According to the site manager Gerry Davis "The retrofit was a great success! The new lights are wonderful, now it is always bright enough in the office." (W10) At the office they are pleased (W9) with the new lights because the older lights that they had been using "were not bright enough at times" and now they can always "easily work under bright new lights" commented Gerry Davis. Light use habits did not change significantly after the retrofit, lights are turned on from 9-5 and during that time they are more content with the lights than prior to the retrofit.

RCEA savings table.jpg

Look at the difference

In the year before RCEA's retrofit the average energy used by the coast central credit union was about 2800 kWh(kiloWatt hours) each month. Over the months since the retrofit the energy consumption at the office has steadily decreased to 1360 kWh, as shown in Figure 1, and as a result the CCCU saved $191 from last August's energy bill. ( C2 This paragraph is not describing the table to right).

Actual Savings from the Retrofits

RCEA audit KWH table.jpg
After a year the Coast Central Credit Union found that:
  • They saved 1,367 dollars in a year(in eletrical costs)
  • Their CO2 emissions reduced by 4,255 lbs/year
  • They reduced energy use by 8,200 kWh/year


As seen in Figure 2, the total energy used in April 2007 to April 2008 was 37,150 kWh. The energy used between April 2008 and April 2009 which was after the light upgrade was 28,960 KWh. The difference of the two gave the total amount energy saved of 8,200 kWh. This figure (value) is actually much higher than the projected amount of (of what?) kWh saved from the retrofit, the amount Redwood Coast Energy Authority said was about 4,784KWh (W12). Figure 2 shows the amount of kiloWatt hour used from Septemeber 2006 to June 2009.(the table is not useful)

CO2 saved

Using the pounds CO2 per kWh from RCEA's estimation we (W4) derived a lb to kWh ratio of .519. (A3) We used with the total energy 8,200KWh to calculate the reduction in pounds of CO2 which was 4,255 pounds of CO2.

Money saved

Using the RCEA's average price per kWh of $.16676 (A4) and multiplying it to the amount of kWh saved is $1,367/year and $114 a month. Which is significantly greater savings from the projected RCEA estimates (W16). At this rate of saving it will only take 11 months for the Coast Central Credit Union to make back the money invested into new light fixtures. (Total cost of the retrofit/monthly savings=Time to break even~$1,256.33/$114/month=11 months)

RCEA audit KWH graph.jpg





Redwood Coast Energy Authority

Union2.jpg Coast Central Credit Union