energy return on investment (eroi)

Single-Family Solar Energy Beats S&P 500 in 46 out of 50 American Cities

January 18, 2015 by NRDC Switchboard

Solar Energy Return on Investment

A just-released report finds that for owners of single-family homes, solar power's likely a better investment than plunking hard-earned cash into the Standards & Poor's 500 stock index; that index has returned about 6.6 percent per year over the last 25 years.[read more]

A New Wind Turbine Generates Back The Energy It Takes To Build It In Just 6 Months

July 2, 2014 by Joseph Romm

Turbine Return on Energy Investment

A new study finds that wind turbines have an energy payback of six months, which is comparable to the best solar photovoltaic systems. In other words, in their first six months of operation, large wind turbines produce the same total amount of energy that was needed to produce and install them.[read more]

The Cost of Production and Energy Return of Oil Sands

December 10, 2013 by Robert Rapier

Oil Sands and Energy Returns

This article continues the series covering my recent trip to the Athabasca oil sands around Fort McMurray, Alberta. This is an annual trip that the Canadian government hosts for energy journalists, and expenses for the trip were paid for by the Canadian government.[read more]

Diminishing Returns, Energy Return on Energy Invested, and Collapse

December 9, 2013 by Gail Tverberg

Diminishing Returns

We know that historically, many economies that have collapsed were ones that have hit “diminishing returns” with respect to human labor–that is, new workers added less production than existing workers were producing (on average).[read more]

Energy Efficiency Loans: Pensylvania Succeeds in Bundling Transactions

March 12, 2013 by Shari Shapiro

energy efficiency loans

People have been saying for years that energy efficiency loans should be able to be bundled and sold, a la mortgages and credit card loans, allowing private capital to invest in pools of energy efficiency loans.[read more]

How Crowdfunding Lowers The Cost Of Solar Energy

March 8, 2013 by Joseph Romm

solar energy

Funds raised from the crowd — in addition to providing attractive returns for investors — also have the potential to lower the cost of electricity from solar PV systems here and now.[read more]

EROEI Explained

December 22, 2011 by Robert Rapier

In this week’s episode of R-Squared Energy TV I present the first of several mini-presentations on energy topics of interest. The presentations will be short, 5 to 8 minute presentations with 3 to 5 slides each. This week’s presentation is on Energy Return on Energy Invested (EROEI). I believe there are a lot of misunderstandings from both proponents and opponents of EROEI methodology, and I attempt to clear up some of the misconceptions.[read more]

Non-proliferation Community Working To Hamper Innovation That May Reduce Both Cost and Power Consumption

May 29, 2010 by Rod Adams

I often suspect that the raison d'etre for the nuclear weapons non-proliferation community is to add barriers that restrict the beneficial use of nuclear energy. Many prominent spokespeople from that community can be counted on to make proclamations of worry for any innovation in the fuel cycle that improves performance, lowers costs, or...[read more]

Energy Internal Rate of Return (EIRR) Numbers from a Literature Review

May 21, 2010 by Tom Konrad

Jamie Bull at oCo Carbon Blog has conducted a literature review of Energy Return on Investment (EROI) for electricity generation technologies. He also calculated Energy Internal Rate of Return (EIRR), a concept I promoted here and here to incorporate the timing of energy flows. Timing of energy flows is as important as total energy...[read more]

TCASE 8: Estimating EROEI from LCA

March 8, 2010 by Barry Brook

The concept of energy return on investment (EROI), often called energy returned on energy invested (EROEI), is a simple and familiar one. Here is the short definition, from the Encyclopedia of Earth. To cite: ———————————————– Energy return on investment (EROI) is the ratio of the energy delivered by a process to the energy used...[read more]