---
title: "U.S. Energy Efficiency Indicator"
method: GET
path: "/markets/indicators/energy-efficiency/us"
tags: ["Market Indicators"]
---

# U.S. Energy Efficiency Indicator

`GET /markets/indicators/energy-efficiency/us`

Retrieve values of the U.S. Energy Efficiency Indicator, a macro indicator developped by Charles Gave to answer the question 'Is energy being transformed productively?'.

> This endpoint requires an API key.

References
* [Charles Gave, The General Theory of Portfolio Construction, Gavekal Books](https://web.gavekal.com/books/the-general-theory-of-portfolio-construction/)

## Response `200`

OK

- object
  - `energyEfficiencyIndicator` object, required — The historical and current values of the Energy Efficiency Indicator
    - `energyEfficiencyIndicatorComputationDate` string, required — The computation date of the current value of the Energy Efficiency Indicator, in format YYYY-MM-DD
    - `energyEfficiencyIndicatorRegion` string, required — The region for which the Energy Efficiency Indicator is provided; always equal to "unitedStates"
    - `energyEfficiencyIndicatorValues` object[], required — The historical and current values of the Energy Efficiency Indicator
      - `date` string, required — The end-of-month date of the data used to compute the values of the Energy Efficiency Indicator, in format YYYY-MM-DD
      - `energyEfficiencyRatio` number, required — The (logarithmic value) of the Energy Efficiency Indicator; base 1.0 for date "1946-01-31"
      - `energyEfficiencyRatio1yma` number, required — The value of the 1-year simple moving average ofenergyEfficiencyRatio; the first 12 values have been computed using an expanding window from 1 month to 12 months
      - `energyEfficiencyRatio7yma` number, required — The value of the 7-year simple moving average of energyEfficiencyRatio; the first 84 values have been computed using an expanding window from 1 month to 84 months

## Other responses

- `401` — Access to the endpoint is not authorized

## Changes

- **2026-08-13** `6f06b5c1e6e5` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/portfoliooptimizer/apis/portfolio-optimizer/changes/markets/indicators/energy-efficiency/us/get.md)

---

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