# High-density polyethylene and Run-of-river and small hydro

Their prices have moved together.

Source page: https://www.materialinsights.org/links/high-density-polyethylene-and-run-of-river-and-small-hydro/

[High-density polyethylene](https://www.materialinsights.org/chemicals/hdpe/) (chemical) and [Run-of-river and small hydro](https://www.materialinsights.org/energy/e_small_hydro/) (energy): 1 relationship.

## How they are linked

### 1. Price link: pipe input

*Cost and price · Weak · Both ways*

Small and micro hydro schemes often use plastic pipes made of HDPE for penstocks. The resin proxy and turbine index show little link, with monthly moves at 0.09 and yearly moves at -0.11.

- **0.09** monthly change correlation
- **-0.11** 12-month change correlation
- **0.44** fitted elasticity

Built from the site data on production routes, energy flows, industry value chains, input-output tables and prices.