The Dollars and Cents of My Home Energy Audit

My wife and I have a townhouse at Crown Harbor over by Crab Cove. In a series of blog posts, I outlined the process we followed in 2011 to make some energy improvements to our home:

• A Modest Proposal: Results of My Home Energy Audit
• A Modest Proposal: Improvements based on My Home Energy Audit

In 2013, we signed up for green energy supplied by the city of Alameda.

• I've reduced my carbon footprint with Alameda Green

I entitled the modest proposal blog posts based on the fact that we wanted to spend a modest amount of money in exchange for modest savings. As the years have passed, I shared the monetary results. If I wanted to be really accurate, I could have expressed the energy reduction in terms of units of energy (e.g., kilowatt hours) instead of dollars. I mention this because by signing up for Alameda Green, we volunteered to pay more for our energy in exchange for not polluting the planet. Had we not done that, our dollar savings reflected in the calculations that follow would have actually greater than what is shown; however, for the sake of simplicity, I am just using the dollar amounts.

Here is what we spent in 2011:

Here are the incentives we took advantage of:

• From Pacific Gas & Electric (PG&E), we received a rebate of $1,216.
• With the help of Advanced Home Energy who performed the work, we also filed a rebate request with the Alameda Municipal Power Company. We received a check for $2,300 from Association of Bay Area Governments.
• In addition, as part of filing 2011 taxes, taxpayers could get a credit by completing Form 5695 — the Residential Energy Credit Form. The Federal Tax program limited the credit to $500 per residence, and since we had already received $450 for the installation of our tankless hot water heater in 2009, we got a $50 credit that time.
• In June 2012, we received another rebate from PG&E for $201.
• In July 2012, we received another rebate from Alameda Power for $82.

When I combine our expenses with our incentives, I get:

Our condo is 1,977 square feet. We have been watching our electric and gas costs since we first moved in, particularly since the work was completed in April 2011.

Various factors affect our results like: average daily temperature, price increases from year to year (particularly for the green energy), how much company we have, and how long our showers are. Variations aside, we have seen reasonable savings and have now come out ahead.

Given our $1,581 out-of-pocket expenses, we have more than recouped our investment by accumulating $2,445 of savings and are actually $864 ahead.

If you look at our minimum and maximum payments, you can see what the best case scenario would look like for the years to come.

As I noted in my original blog post, we undertook this project, not for the money, but because we felt our house was broken. When you borrow money to pay $646,000 for a townhouse, another $1,581 to make it right doesn't seem all that wrong. From now on out, it's all additional savings per year, so it makes sense from both an environmental and financial standpoint.