# WESM Rules Chapter 4: Electricity Metering Requirements
> Learn about metering obligations, MSP registration, data security, and compliance rules for the Philippine Wholesale Electricity Spot Market (WESM).

Tags: wesm-rules, energy-metering, electricity-market, metering-service-provider, energy-compliance, philippines-energy
## Slide 1: WESM Rules Chapter 4 Metering
* Effective date: November 5, 2024.
* Overview of Sections 4.1 to 4.10 including obligations, registration, and data validation.

## Slide 2: Scope of Chapter 4
* Covers requirements for installation, use, security, and management of metering data.
* Applies to Customers, Generation Companies, MSPs, and WESM Members.

## Slide 3: Obligations of Trading Participants
* Each market trading node must have a metering installation.
* Participants must elect a Metering Services Provider (MSP) and provide installation details to the Market Operator within 10 business days.

## Slide 4: Registration of MSPs
* MSPs must be authorized by the ERC.
* Generation companies or trading customers cannot register as MSPs for their own assigned nodes.

## Slide 5: Metering Installation Requirements
* Must include electronic data recording with 60-day storage and 48-hour power failure backup.
* Meters must be installed within 500 meters of the connection point.

## Slide 6: Security and Performance
* MSPs must protect equipment from unauthorized interference.
* Performance requirement: at least 99% data transmission availability per annum.

## Slide 7: Metering Data Management
* MSPs are strictly prohibited from altering original stored data.
* Market Operator retrieves data for billing and settlement.

## Slide 8: Deregistration and Sanctions
* Processes for correcting data loss, tampering, or failure.
* Market Operator may deregister an MSP for material breach or unethical acts.

## Slide 9: Databases and Confidentiality
* Installation databases must be maintained by the MSP; Metering databases by the Market Operator.
* Data retention: 16 months accessible, 10 years archived.

## Slide 10: Final and Transitory Provisions
* Market Operator manages data validation and substitution.
* Regular reviews occur to address new technologies and market contestability.
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