Gmail vs. Yahoo Mail Users: Who Spends More on Electricity?

Gmail vs. Yahoo Mail Users: Who Spends More on Electricity?

Opower Data Shows Yahoo Mail Users Spend $110 a Year More on Electricity Than
Gmail Users

ARLINGTON, Va., June 14, 2012 (GLOBE NEWSWIRE) -- Yahoo Mail users will spend
$110 more this year on electricity compared to Gmail users according to
Opower, the global leader in energy information software for the utility
industry. Based on the company's cutting-edge behavioral science and
patent-pending data analytics, Opower found that, on average, Yahoo Mail users
consume 939 kilowatt-hours (kWh) more than Gmail users, or about 11% more
electricity per year – a sizeable, statistically significant difference in

By analyzing consumer energy information derived from their work with more
than 70 utility companies – including 8 of the 10 largest in the U.S. – and
containing data from 40 million homes, Opower looked at the correlation
between email address and electricity usage across 2.8 million American
households around the country. About 1.15 million of those households are
Gmail or Yahoo users, and are spread out across 23 states and several distinct
climate zones.

According to Opower, the reason Gmail users consume less energy than those
with Yahoo Mail has to do with the users themselves. Opower's data indicates
that Yahoo Mail households are more likely to live in larger residences and
also use more electricity per square foot. In contrast, Gmail users tend to
live in cities, where dwellings are often more compact and energy-efficient.
In addition, Opower found that Gmail users are more likely to sign up for an
in-depth analysis of their home energy usage.

While Yahoo Mail users cannot simply switch email accounts to reduce their
energy consumption, they can adopt simple ways to cut back – such as turning
off computers at night, getting a programmable thermostat, or upgrading a
heating system – to make an impact on their utility bills. Opower's products,
which include easy-to-understand, printed Home Energy Reports delivered with
monthly utility bills, have helped consumers save more than $100 million to

"Making energy consumption relevant to consumers is something that Opower
strives to do every day," said Opower President Alex Laskey. "We hope that by
analyzing the data that we have on over 40 million homes and providing
insights about how Americans are using electricity, we can make the topic
interesting and inspire people to make changes in the way they consume

The correlation between email address and electricity usage is the inaugural
topic to appear in Opower's new corporate blog, "Outlier," which will provide
unique insight into how Americans use energy.

Read the post: []

Opower's blog will include posts in three sections: Outlier; Opower Labs,
featuring software development discussions from Opower's engineering team;
and, Our Thinking, with posts describing company initiatives and culture.

Energy data, provided by utility partners, is at the core of Opower's
platform: the data allows Opower to give families context on how their energy
use compares to similar neighborhood homes and insights into what actions
could help them save energy – and save money. Opower works with over 70
utilities in the US and UK, actively sends information to over 10 million
homes, and analyzes information from more than 40 million homes. Outlier will
aggregate that energy data to develop insights about American energy
consumption as a whole.

A Note on Methodology

Annual electricity usage of households is based on 2011 data. Of the 2.8
million household electricity customers with email addresses in Opower's
dataset, 1.15 million were Gmail or Yahoo users. The usage difference between
Yahoo users and Gmail users is statistically significant at the 99% confidence
level based on a t-distribution. Average cost per electricity in US during
2011 was $0.118/kWh (link:
( All data analyzed
for this article is completely anonymous and is treated in adherence to
Opower's Data Principles (

About Opower


Opower is the leader in energy information software, providing the utility
industry's only cross-channel platform proven to drive energy efficiency gains
on a large scale. Using cutting-edge behavioral science and patent-pending
analytics, the Opower platform enables utilities to provide targeted energy
data and advice to each customer. Over 70 utilities—including 8 of the 10
largest in the U.S. — partner with Opower to improve the effectiveness of
their energy-efficiency portfolios and motivate their customers to become more
energy efficient, while dramatically increasing the level of customer
engagement and overall customer satisfaction. Founded in 2007 and privately
held, Opower is headquartered in Arlington, Virginia, with additional offices
in San Francisco and London. For more information, please visit
and follow us on Twitter at @Opower

The Opower logo is available at

CONTACT:  Carly Baker
          571-384-1974 (direct)

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