Various innovative solutions are necessary to make the integration of RES into the common energy system more flexible. Energy storage options are already widely used. It is possible to accumulate both electricity and heat.

Currently, the largest electricity reserves are stored directly in HPPs reservoirs, as well as in pumped hydroelectric energy storage (PHES). PHES operates in a similar way to HPPs by pumping extra water from the lower tank to the upper one. To better integrate solar and wind energy into the energy systems, pumped storage will not be appropriate. For now, electricity is stored in batteries. Although, they rapidly lose their maximum energy storage capacity and are still being improved.

In addition to batteries and energy storage in water reservoirs, other solutions for energy storage are being sought both for the short term and long term. Energy storage technologies such as compressed air storage, hydrogen production from renewable energy sources and energy storage in various household electrical appliances, including electric cars, are already being explored as potentially useful in the future. These technologies have not yet been put into practice. Energy storage opportunities are important in both commercial energy generation and energy generation for own consumption.

Currently, the most used solution for the use of surplus energy, especially in households, is grid transfer. If there are several households nearby or households and companies that generate their own energy, they can merge into one energy community. The Energy Community is an organised group of people who take steps to move their immediate surroundings towards the generation and use of clean energy on a non-profit basis. There is no limit to the scale of energy generation, it goes from a few solar panels to a wind farm. Energy communities most often unite the inhabitants of a city, municipal quarter, or street.

The main goal of energy communities is to promote the use of renewable energy in the vicinity of a specific place (village, small town, or city), to preserve the environment and to strengthen the economic potential. Energy communities are united by the fact that locally generated energy is primarily used by local people. For example, if solar panels are installed on an apartment building, then the energy generated is first used in communal buildings, and then it is used by the apartment owners of the existing house. If all the electricity generated is still not fully used, it is transferred to other nearby houses or to the grid.

To use the electricity generated more efficiently, it is also important to use smart technologies.

The smart technologies introduced can be as simple as hybrid technologies (using two or more RES technologies together), installation and synchronisation of storage or charging facilities, up to complex systems that control the consumption of all equipment in buildings or estimate the amount of energy generated from RES in accordance with the weather forecasts.

In the context of renewable energy, the latter will be most important, as when forecasting the amount of renewable energy, there is a greater chance of using it to the full, thus, reducing energy losses.