Statements of successfull STO-makers
Our common target is to tackle all the challenges and take advantage of the opportunities to achieve a real sustainability, both for the municipal administration and the neighbors of our municipality. In this point, Solar Thermal Energy is a very important potential for our municipality. The Solar Thermal Obligation will contribute to regulate, guide and enhance the development of these systems, increasing the use of energy coming from renewable resources and reducing CO2 emissions.

Mrs. Adela Martínez Cachá - Deputy Mayor for Environment and Urban Quality at the City Council of Murcia (SP). Vice-President of the Local Agency for Energy and Climate Change  of Murcia.

Today, energy is a part of everyday life! As leaders in our community, we have the obligation to set an example of good practice in the areas of energy saving and renewable energy use, so that citizens would acknowledge the importance of each gesture intended to contribute to the health of the planet.

Eng. Lucian ILIESCU – Mayor of Giurgiu Municipality (RO)
“Solar thermal has enormous potential and low costs. Our challenge in Lazio is to convince people of the advantages deriving from its use.”

Mr. Filiberto Zaratti - Regional Minister for Environment and Cooperation among Peoples, Lazio Region (IT)

Solar energy will be
the “sun of energy”!

Professor Eduardo de Oliveira Fernandes - Secretary of State for Environment (Portuguese Government, 1984-1985), Secretary of State to the Minister of Economy for Energy and Innovation (Portuguese Government, 2001-2002), former Chairman of the Commission for Buildings Thermal Regulations at the CSOPT  (Portuguese Ministry of Public Works, 2002-2006)

Our justifiably ambitious climate protection goals are reachable. However, this needs active combatants. With the provided regulations we found a passable way for on one hand making an effective contribution to reducing CO2-emmissions and on the other hand not overburden the single citizen. People do follow, because they feel, that we have to act for protecting the climate.

Tanja Gönner - Minister for the Environment of the State of Baden-Württemberg (DE)

STO Database
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Renewable Heat Law Baden-Württemberg
Federal State of Baden-Württemberg

In November 2007 the parliament of the state of Baden-Württemberg approved its Erneuerbare-Wärme-Gesetz Baden-Württemberg (Renewable Heat Law Baden-Württemberg). Initially it effects only new residential buildings started after 1. April 2008, for which house builders are obliged to cover 20 % of the yearly heat demand with renewable heat sources. Beside the use of solar thermal, geothermal, biomass and ground coupled heat pumps the law also foresees alternative measures such as improved house insulation, cogenerators or the connection to district heating networks fed by RES or cogenerators. Starting from 1. January 2010 the law will also effect existing residential buildings.
The regulation of this law for new buildings was replaced by federal law EEWärmeG (see separate case study) on 1 January 2009.

Building Code of Carugate (Province of Milano)
City of Carugate (Province of Milano)

In 2003, the small (less than 15,000
inhabitants) Municipality of Carugate adopted a new building regulation which promotes energy efficiency in general.
In particular, following the model of Barcelona “Solar Ordinance”, the use of solar thermal systems to produce at least 50% of the domestic hot water demand was introduced as a mandatory measure for new buildings.



Italian national law on energy efficiency in buildings

The Law no. 192 (August, 19th 2005), modified and integrated through Law no. 311 (December, 29th 2006),  is the implementation, at national level for Italy, of the EC Directive 2002/91/CE, about energy efficiency in buildings.
This law foresees minimum requirements for energy efficieny and the use of renewables in new and refurbished buildings..

Portuguese Regulation on Thermal Performance of Buildings (RCCTE)

The RCCTE imposes the usage of solar thermal collectors for hot water production if there are favourable conditions for exposure (if the roof or cover runs between SE and SW without significant obstructions), in a basis of 1m2 per person (the total can be reduced up to 50%).
Other important requirements of the Portuguese STO defined within RCCTE are the following:
- For performance calculation of such systems, the product certification according to the European Standards is needed.
- This performance calculation is done using a programme developed by INETI, the SolTerm code.
- The installers of these systems must also be certified installers.
- The solar system must be guaranteed by a six year maintenance contract, covering the whole solar thermal system.

Modification of the building code of the City of Rome.
City of Rome.

This ordinance, issued by Rome City Council in 2006, introduced some modifications in the city building code, dealing with energy and water saving measures, as well as renewable energies.
The text of the ordinance could be downloaded from:


Regional obligation in Lazio for solar thermal systems and water saving in buildings.
Region Lazio

The herein described Law no. 15 foresees the mandatory use of solar thermal energy and the rational use of water in buildings. Its scope includes both new and under refurbishment buildings.
The law itself does not go into details regarding specific measures to be applied, leaving to the Municipalities the duty to apply the law in details.
The text of the law could be downloaded from:

Local Building Energy Standards in Ireland.
Some Counties of Ireland.

Starting at the end of 2005, a number of progressive local authorities introduced building energy standards as part of planning requirements in their jurisdiction. These building energy standards require a substantial increase in the energy performance of new buildings (between 40% and 60% reduction in energy usage) as well as a mandatory contribution of renewable energy to their thermal energy requirement.
What is more, a new regulation al national level has been introduced in 2008. This shows clearly that the local energy standards adopted by several counties were a positive experience.

Código Técnico de la Edificación (Spain).

The existing building code (CTE) entered into force in 2006. Among the basic quality requirements for buildings, the CTE contains the DB-HE chapter which aims, among others, at the efficiency of thermal installations and the application of solar thermal systems for hot water preparation for domestic purposes and indoor swimming pools. It is applicable for all new buildings and integral renovation projects (>1000 m2) when the hot water demand is higher than 50 l/day at a reference temperature of 60 ºC.
It is stated that for all new buildings and renovations a minimum solar fraction from 30 to 70% is required (depending on climate zone, hot tap water demand and energy source for back-up heating). The values established by the CTE are minimum values to cover the basic demand.

Decret d’Ecoeficiencia (Catalunya, Spain).
Region of Catalunya

The Decree aims at regulating the criteria for the sustainability of buildings in Catalonia, promote social consciousness in the way to conceive, design, build and use buildings in a sustainable way. Four action fields have been established within the decree: water, energy (including solar thermal), materials, construction methods and waste.

Barcelona Solar Ordinance.
City of Barcelona.

The Barcelona Solar Thermal Ordinance entered into force in August 2000. Its main promoter was the Sustainable City Council. The purpose of this ordinance is to regulate the incorporation of solar thermal energy and its use for the production of hot tap water in the city’s buildings. The Solar Ordinance affects new, restored and fully refurbished buildings and those seeking to implement a change of use. This regulation applies to buildings intended for residential, health-care, sports, commercial and industrial use and, generally, any activity involving the existence of kitchens, laundries or other circumstances that lead to a large consumption of hot water, regardless of whether they are public or privately owned.

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