Case Studies / Onshore Wind

Nysäter Onshore Wind Farm

Nysäter Wind consists of two wind park projects, Hästkullen (307 MW) and Björnlandhöjden (167 MW), located near the city of Sundsvall in Sweden.

Project Overview

Investment Year: 2018
Ownership Stake: 80%
Technology: 114 Nordex Wind Turbine Generators (104 x N149/4.0-4.5 and ten x N131/3900)
Industrial Partner: RWE

Energy Infrastructure Partners joined RWE Renewables (formerly E.ON) to finance the project before construction began in 2019. The project was developed by RWE, a leading European utility company and a global player in on- and offshore wind, who remain co-investor with a 20% stake in the project.

The scope of the ready-to-build project involves all aspects of construction from building roads and foundations to ultimately connecting the last turbine to the grid. This work is carried out by main contractor and turbine supplier Nordex, to be delivered turnkey in 2021.

With the benefit of owner-incentivized attention to wind farm performance and technical integrity, RWE is the operations and maintenance (O&M) service provider, under a responsibility regime that aligns incentives and mitigates both construction and operational risks.

A power purchase agreement stabilizes cash flows and enables long-term project financing

Power purchase agreements, or PPAs, lessen volatility risk from the electricity market by allowing for the sale of a portion of the asset’s future electricity production to a third party over a fixed number of years or decades at a pre-set price, resulting in the stabilization of cash flows. Working closely with a third party to develop a pay-as-produced power purchase agreement for Nysäter Wind resulted in an improved risk/return structure.

Two turbine models to suit varying wind conditions and terrain

Nordex is a Germany-based global supplier of onshore wind power systems. Two different models of Nordex wind turbine generators (WTGs) with varying heights are installed at Nysäter Wind. The 114 WTGs are comprised of ten model N131/3900’s and 104 model N149/4.0-4.50’s, both representing the latest technology with increased wind coverage and annual energy production.

The N131 turbine, with a nominal output of 3.9 MW, is better suited for locations with lighter wind conditions. The N131 has hub heights of 84 to 134 meters.

N149, the quietest turbine in its class

In comparison to the N131, the N149 turbine is installed at sites with low to moderate wind speeds, and achieves a 20% or greater increase in annual energy production compared to previous models. This efficiency makes the N149 the highest yielding WTG in the 4.0-4.5 MW segment; it is also the quietest turbine in its class. Hub heights of 105, 125 and 164 meters are placed to maximize yield in different locations.

The turbines are flexibly configured to adapt to local conditions and optimize energy yields. They can operate at temperatures down to -30 degrees Celsius, and each turbine has been carefully positioned to maximize efficiency and minimize the overall levelized cost of energy for the project.

Generating electricity for hundreds of thousands of homes

Nysäter Wind supports Sweden’s renewable energy targets as it works to become a “fossil-free” nation. Sweden has the highest share of renewable energy in the European Union, with renewable sources constituting more than 60% of total installed power generation capacity.

Although hydropower makes up the largest portion of renewable energy in Sweden, wind power is rapidly growing thanks to the availability of dependable wind speeds along the coastline.

Nysäter Wind will contribute to Sweden’s targets by producing enough energy to power as many as 300,000 homes per year1.

This is as much as the entire region of Västernorrland, in which the wind farm is located, consumes annually.

In addition, advances in wind turbine technology have dramatically increased efficiency during the past decade. In 2014 and 2015, the original permits for Nysäter Wind were granted with an anticipated scope of 150 turbines.

However, studies showed that by using more powerful turbines with efficient technology and increased hub heights, the same level of output could be achieved with only 114 WTGs.

1Assuming an annual average household consumption of 5000 kWh.