The €800m ($856m) deal includes acquisition costs and the capital required for constructing the projects.
Located in Sweden’s Kramfors and Sollefteå municipalities, the four projects are expected to start exporting power to the country’s national grid in 2025.
RPC will also be responsible for the procurement and construction management of the four onshore wind farms.
The projects are expected to collectively produce enough clean energy to power 182,000 homes.
The deal is RPC’s third so far this year and has increased its onshore wind portfolio across Sweden and Finland from 317MW to 845MW.
In addition to its onshore wind capacity, the company has a 4GW solar photovoltaic (PV) pipeline in Spain.
RPC CEO Bob Psaradellis said: “Today marks a landmark moment and the biggest deal to date for RPC, but it also forms part of a long-term strategy to invest in post-subsidy renewable power and storage infrastructure across Europe.
“We set out to bring a new approach to investing in, owning and operating renewable energy assets and we see our relationship to projects very much over the long term, which is why we continue to have strong conviction in renewable energy despite the current volatility in the market.
“Increased renewables capacity in Europe in a post-subsidy world is good for energy security and for the energy transition.”
The name of the seller has not been disclosed, but they were advised by Newsec Infra.
Newsec Infra managing partner Omid Ashrafi said: “We are delighted to sign the deal with RPC and work alongside the team to enable the construction of this high-quality 528MW portfolio.”
Last March, RPC partnered with Spanish solar PV developer Benbros Solar to develop 14 solar energy projects across Spain.