The effects of climate change are already impacting people’s quality of life worldwide. Evidence highlights the urgency in action to counteract this on-going process. Europe aims at fostering the green transition becoming climate neutral by 2050. The envisioned pathway encompasses an overhaul of the energy system including an increase in renewable energy production and end-user energy efficiency. The EU further recognizes the fundamental role of citizens and communities in addressing an effective transition. Within this framework, energy communities (EC) and peer-to-peer (P2P) energy trading are emerging as new opportunities for boosting green technologies in renewable energy and the smart grid sector, and for rising citizens’ awareness of the theme. However, the implementation of P2P ECs in Europe entails complex legal challenges that cannot be solved only through sector-specific regulation. This open letter critically presents the experience gained in the H2020 NRG2peers project about the knowledge advancement in the regulatory context of the project pilot sites. These are located in four EU ecosystems (from innovators to laggards) that are: the Netherlands, Spain, Slovenia, and Italy. Each EC involved in the NRG2peers project is thus facing different challenges related to its specific socio-economic condition and energy market framework. These barriers need to be overcome and new tools will be delivered during the NRG2peers project. Moving from the lessons learnt at the pilot sites, both roadmaps at the regulatory level and an advisory app are under development to support the uptake of the next generation of European peer-to-peer Energy Communities.

Buildings are great contributors to global GHG emissions, because they are responsible for direct and indirect emissions. In light of increased renewable energy share in the electricity mix, it is crucial to boost residential electrification for building decarbonization. Consequently, building regulation ought to send the proper signals to the market to encourage electrification and avoid establishing new fossil fuel-based infrastructure, which may lock in future interventions and seriously compromise climate change mitigation. This paper studies short-term residential electrification with electric water tanks in Spain using a parametric analysis considering several water heater configurations with various sizes and management strategies, using different draw-off profiles, actual time-dependent electricity prices, and CO₂ factors. The results demonstrate significant GHG savings when substituting fossil fuel boilers for any water heater configuration. However, current electricity prices are such that technology change is only cost effective for low hot water demands (1–2 people) and the provided fossil fuel supply is completely removed from dwellings. The exploitation of implicit demand response increases cost-effectiveness. The analysis of Spanish regulation shows that some elements of current policies on energy efficiency in buildings hamper residential electrification, consequently policy changes are proposed.

Renewable energy sources such as PV solar or wind power are intermittent and non-dispatchable. Massive integration of these resources into the electric mix poses some challenges to meeting power generation with demand. Hence, improving power generation forecasting has raised much interest. This work assesses the market value of enhanced PV solar power generation forecasting. Then, we analyse the different agents present in the electricity system. We link the studied agents to the proposed market values based on both analyses. Improving the accuracy of RES forecasting has massive potential as the sector grows and new agents arise. It can have reactive values like reducing imbalances or proactive values such as participating in intraday markets or exercising energy arbitrage. However, accurate forecasting can also lead to opportunistic values that can be exploited by malicious agents if they are not adequately regulated.