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Energy Efficiency Standard and Notification System

Energy efficiency standard and notification system are regulated by the Act on the Improvement of Energy Consumption Performance of Buildings (Building Energy Efficiency Act), which obligates the buildings of the construction clients (including building owners, builders and architects) to comply with energy efficiency standard. And construction clients should notify the administrative agency with jurisdiction of their achievements for building’s energy efficiency standard.

1. Background

The energy conservation standards for housing and building were first established in 1980 as part of the revised Act on the Rational Use of Energy (Energy Conservation Act). These energy conservation standards are called the “Standard of Judgment” in the Act. Originally, the “Standard of Judgment” was by technology (including building envelope performance). Since the inception, the standard was revised twice in 1992 and 1999.In 2013, the Standard was revised from prescriptive standard (set by technology) to performance standard, which is called “Energy Efficiency Standard”. Energy Efficiency Standard is comprised of (1) Energy Consumption Performance Standard and (2) Envelope Performance Standard. The Energy Consumption Performance Standard calculate overall primary energy consumption from heating and cooling, ventilation, water heat supply and lighting.

In 2003, notification system was introduced that mandates construction clients to notify the administrative agency with jurisdiction of their achievements for building’s energy efficiency standard. Coverage of the notification system gradually expanded in 2006 and 2010, starting from buildings with floor space over 2,000 m2 to that with 300 m2

2. The Act on the Improvement of Energy Consumption Performance of Buildings (Building Energy Efficiency Act)

On the first of July 2015 "Act on the improvement of the energy consumption performance of buildings" was newly issued. Previously, the energy efficiency improvement of buildings was regulated under the Energy Conservation Act, while, being separating from the Energy Conservation Act, new Act was issued to specifically target at this sector. Under the new Act, more strict compliance path of energy efficiency standard and notification system will be enforced. For example, mandatory compliance on commercial buildings’ energy efficiency standard (for the buildings whose floor space represent above 2,000 m2) will be introduced from 2017, and the Government is planning to introduce the mandatory compliance on the energy efficiency standard for the commercial buildings (of which floor space represent below 2,000 m2) and residential buildings by 2020. The details are described below.

Measures depending on the size of building (from FY2017)

1) Non-residential building of 2,000m2 or more

a. Buildings are to conform with energy consumption performance standard.

b. Buildings should be checked by an approved organization regarding the energy consumption performance

2) Buildings of 300m2 or more

Obligation of notification is imposed. In case the building dose not conform with standard, the Government Issue instruction and/or order.

3. Current and Next Regulation

When construction clients attempt to undertake new construction/extensions/renovations on buildings at or over a certain size, they must notify the administrative agency with jurisdiction of their achievements for building’s energy efficiency standard depending on the use and size. In case the building doses not comply with standard, the Government can provide recommendation, instruction or order to the construction clients. After FY2017, large-scale non-residential building that is not compliant with energy efficiency standards become ineligible for certification of Building Standards Law. Coverage of regulation is described below table.

 

Size

Sector

Measures

Regulation in FY2016

Regulation after FY2017

Large scale building

(2,000m2 or larger)

Non-Residential

Construction clients’ obligation

Obligation to notify

Mandatory compliance

(need for certification)

Government action

(Non compliant standard)

(instruction and/or order)

(not issue a construction license)

Residential

Construction clients’ obligation

Obligation to notify

Government action

(Non compliant standard)

instruction and/or order

Middle scale building

(over 300m2 to under2,000m2)

Non-Residential

and

Residential

Construction clients’ obligation

Obligation to notify

Government action

(Non compliant standard)

recommendation

instruction and/or order

Small scale building

(under 300m2)

All

Construction clients’ obligation

Obligation to make effort (not mandatory)

Applicable Building Type(s)

New residential, New non-residential, Existing residential, Existing non-residential

Policy Requirement Level

Mandatory

Policy Sequence

Governance

Development Authority: Ministry of Economy, Trade and Industry (METI), Ministry of Land, Infrastructure, Transport and Tourism (MLIT)

Implementation Authority: Ministry of Economy, Trade and Industry (METI), Ministry of Land, Infrastructure, Transport and Tourism (MLIT)

Verification Authority: Local Authority or third party organization (from FY2017)

Enforcement Authority: Local Authority

Prescriptive Compliance path

Energy Requirements:

Performance Compliance path

Energy efficiency Standard (Energy Consumption Performance Standard and Envelope Performance Standard)

Energy Efficiency Standard is composed of (1) Energy Consumption Performance Standard and (2) Envelope Performance Standard. Different standard and value are applied to buildings (non-residential/residential) whether they are new buildings or existing ones. The details are described below.

 

1. Non-residential buildings

-Energy consumption standard

 Primary energy consumption amount * Design value / Standard value <= 1.0 (existing building <= 1.1)

 

-Envelope Performance Standard

Exempt from application

 

2. Residential buildings

-Energy consumption standard

 Primary energy consumption amount * Design value / Standard value <= 1.0 (existing building <= 1.1)

 

-Envelope Performance Standard

UA Design value <= Standard value

ηAC Design Value <= Standards value

 

* Primary energy consumption is calculated as follows.

Primary energy consumption amount = heating and cooling + ventilation + lighting + hot water supply – renewable and cogeneration energy

** UA represent average residential building envelope’s heat transmission coefficient, which is calculated in the following formula.

 UA = Amount of total heat loss per unit of temperature difference / Total surface area of exterior

*** ηAC represent average solar heat gain coefficient during cooling period, which is calculated in the following formula.

 ηAC = 100 x Amount of total solar heat gain per unit of solar radiation intensity / total surface area of exterior 

 

Energy Requirements:

Compliance Softwares:

Residential: Programe for calculating primary energy consumption in house Ver 2.0.3

URL: http://house.app.lowenergy.jp/

 

Non-Residential: Programe for calculating primary energy consumption in non-residential Ver 2.1

URL: http://building.app.lowenergy.jp/

End-uses considered:

Equipment, Appliances, Lighting interior, Space cooling, Space heating, Ventilation, Water heating

Resources

Notes

Climate zones