CHPQA Standard

Page type: primary-anchored (mirrors The CHPQA Standard, Issue 7 v2)

Source file: chpqa.md

What this instrument does

The CHPQA Standard is the government's quality assurance framework for Combined Heat and Power (CHP) schemes in the UK. It defines what counts as "Good Quality CHP" and sets the methodology for measuring it. Schemes that meet the quality thresholds earn a CHPQA certificate, which unlocks eligibility for several fiscal and subsidy benefits.

Unlike most instruments in the GB energy framework, CHPQA is not a statute or licence condition -- it is an administrative programme run by a contracted Administrator on behalf of DESNZ. But its practical effect is powerful: without a CHPQA certificate, a CHP scheme cannot access Climate Change Levy exemption, Carbon Price Support relief, business rates exemption on generating plant, and (via GN44) Renewables Obligation or CfD eligibility for biomass/EfW with CHP.

The Standard covers the whole UK, including Northern Ireland -- unusual for an energy instrument that usually applies only to GB.

How quality is measured

The Quality Index (Section 5.5)

The central metric is the Quality Index (QI), calculated as:

QI = (X x eta_power) + (Y x eta_heat)

Where: - eta_power (Power Efficiency) = total power output / total fuel input - eta_heat (Heat Efficiency) = qualifying heat output / total fuel input - X = coefficient representing alternative power supply options (varies by fuel and scheme size) - Y = coefficient representing alternative heat supply options (varies by fuel and scheme size)

All efficiency values are based on Gross Calorific Value (GCV) of the fuel.

The X and Y coefficients are set out in Table 1 of the Standard. For natural gas schemes, X ranges from 172 (for >500 MWe schemes) to 249 (for <=1 MWe schemes), while Y is consistently 113. For alternative fuels, Y is consistently 120, while X varies more widely depending on fuel category and size.

Threshold criteria for Good Quality CHP

A scheme qualifies as Good Quality CHP if it meets the relevant threshold (Section 4):

Additionally, schemes must deliver primary energy savings compared to separate production of the same heat and power: >0% for schemes under 1 MWe, >=10% for schemes 1 MWe and above, and >=70% overall efficiency (NCV basis) for schemes above 25 MWe.

Partial qualification

Schemes that fall below the QI threshold are not simply rejected. Instead, the Standard calculates the portion of their fuel input, power output, and capacity that qualifies as Good Quality CHP. This means a scheme can be partially certified, receiving benefits proportional to its qualifying share (Sections 5.7-5.9).

The certification lifecycle (Section 5)

1. Registration (S.5.2): The Responsible Person creates an account on the CHPQA portal and provides details of themselves and the scheme location.

2. Monitoring (S.5.3): The RP must install metering systems covering all energy inputs and outputs, designed to accuracy standards set in the Guidance Notes. Records must be retained for at least six years.

3. Self-Assessment (S.5.4): Each year (Annual Operation = calendar year), the RP submits data through the portal covering scheme boundary, QI formula selection, Power Efficiency, Heat Efficiency, QI, and qualifying outputs/capacity.

4. Validation (S.5.4): The Administrator checks the assessment method, assumptions, and data consistency.

5. Certification (S.5.4): The Administrator determines whether the scheme meets Good Quality CHP thresholds and issues a Design Certificate (for proposed schemes) or Operational Certificate (for operating schemes).

6. Audit (S.6): Periodic, selective site-based audits, scope proportional to scheme size.

Grandfathering rules (which QI formulae apply)

The Standard has a layered grandfathering regime for which version of the QI coefficients applies:

• Pre-2016 schemes (Design or Operational certificate before 1 Jan 2016): Continue on whatever formulae they were previously certified under.
• New schemes from 2016: Use Issue 6 QI formulae.
• CfD-linked schemes: Any scheme where a CfD contract is entered into on or after publication of GN44 Issue 7 uses Issue 7 formulae.
• Upgraded/expanded schemes: Continue on existing formulae.
• Complete replacements: Treated as new schemes; Issue 7 applies.

Two-track QI formulae: Standard vs GN44

An important subtlety: the X and Y coefficients in Table 1 of this Standard are used for CCL exemption, Carbon Price Support, and business rates purposes. For Renewables Obligation and Contracts for Difference purposes, Guidance Note 44 (GN44) Issue 7 provides a separate set of QI formulae which are generally more demanding. This creates a two-track system where a scheme might qualify for fiscal benefits under the Standard but face a higher bar for RO/CfD eligibility.

The CfD Allocation Framework (Rule 4.1(b)) explicitly requires a CHPQA Certificate as a Further Condition Precedent for dedicated biomass with CHP and energy from waste with CHP technologies.

Penalties and appeals

• Penalties (S.7): Submitting misleading information to gain eligibility is subject to penalty arrangements enforced by the relevant government department.
• Appeals (S.8): Directed first to the Administrator, with ultimate referral to DESNZ.
• No formal governance process: Unlike industry codes with modification procedures, the Standard is changed at the Department's discretion. The formulae are explicitly "subject to any amendments or revisions deemed necessary by the Department."

Defined terms

See the source file for the full defined terms register (30+ terms).

Cross-references

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Last updated: 2026-04-05