Happy Valley Reservoir (HVWWBA1)

BESS · South Australian Water Corporation · Storage - Battery

Dispatch stats Financials
Operational AEMO: In Service SA1 Other - Other NEM data · 23h
6/9 MW
Registered nameplate capacity / storage
23h revenue
$826
Capacity factor
2.5%
Revenue / MWh
$262.92
Est. SRMC
$1.58/MWh

Energy flow

Dispatch target (cleared) vs availability — 5‑minute intervals. SA1 regional price (RRP) on right axis.

Key information
Capacity
6 MW / 9 MWh

AEMO status In Service
Project status Operational (AI)

SA Water news 2022; the battery at Happy Valley Reservoir was commissioned and put into service by Dec 2022.

Region SA1
Coordinates -35.07300, 138.57200 (AI)

Latitude.to / SA Water reservoir page; Happy Valley Reservoir coordinates near -35.073, 138.572.

MLF 1.0022
DUID HVWWBA1
Owner South Australian Water Corporation
Commissioned Dec 2022
Expected closure 2041
Closure date —
Technology Storage - Battery
Fuel Other - Other
Battery OEM SA Water
Battery platform / chemistry battery
Inverter OEM Tesla
Inverter / PCS model Megapack
Equipment confidence low
Stats window
22 Jul 2026 00:00 → 22 Jul 2026 22:55 AEST

Dispatch & revenue

22 Jul 2026 00:00 → 22 Jul 2026 22:55 AEST

Energy revenue (× MLF)
$826
FCAS revenue (× MLF)
$1
FCAS volume
40.1 MWh
Dispatched
3.1 MWh
Available
16.3 MWh
Curtailed
20.9 MWh
Curtailment
128.0%
of available
MLF used
1.0022
end of period

Revenue (× MLF)

Estimated $ per interval — energy (RRP) and FCAS (regional FCAS prices), both × MLF.

🔋 State of charge

Stored energy at the start of each 5‑minute interval (AEMO INITIAL_ENERGY_STORAGE). Available up to the latest next‑day dispatch file.

4.6 MWh 52%
at 22 Jul 04:00 · of 9 MWh registered

Methodology & assumptions

  • Dispatch & availability — AEMO Next Day Dispatch UNIT_SOLUTION (5‑minute intervals). Intervention intervals excluded.
  • Regional price — dispatch_price RRP matched by settlement time and NEM region (from generator registry).
  • Energy revenue (× MLF) — cleared MW × (5/60 h) × RRP × MLF.
  • FCAS revenue & volume — cleared FCAS MW from DISPATCHLOAD (raise/lower 6s, 60s, 5min, reg) × (5/60 h) × regional FCAS price × MLF. Volume is total FCAS enablement MWh across services.
  • State of charge — INITIAL_ENERGY_STORAGE (MWh at interval start) from UNIT_SOLUTION, published for bidirectional/storage units. Next-day data — the SOC line lags real time by up to a day.
  • Curtailment — estimated economic curtailment when availability exceeds dispatch target: max(0, availability − cleared) × (5/60) MWh.
  • Not settlement — estimates only. AEMO settlement applies DLF, rebids, constraints, and other factors not modelled here.
MLF history (AEMO daily)
Effective fromMLF
2024-09-06 1.0043
2025-07-01 1.0024
2026-07-01 1.0022
2026-07-13 1.0022

Financial overview

2026 real AUD. Monetary values are CPI-adjusted to 2026 real Australian dollars. Greenfield capex uses AEMO benchmarks when plant-specific cost is unknown.
Type
Battery (BESS)
Capacity
6 MW / 9 MWh
Revenue (× MLF) (stats)
See dispatch stats link above
Est. SRMC
$1.58/MWh
Capex total (greenfield)
$3.26M

Shown in table
$3.26M (2026 real AUD)

Reported / source value
$3.09M (2024 nominal)
Adjusted to 2026 real AUD using Australian CPI (All Groups).

How this was derived
No plant-specific greenfield construction/investment cost found in the available sources.
Capex refurbishment
—
Capex / MWh storage derived
$369,198

Shown in table
$369.2k (2026 real AUD)

Reported / source value
$350.0k (2024 nominal)
Adjusted to 2026 real AUD using Australian CPI (All Groups).
Fixed OPEX (annual)
$145.6k

Shown in table
$145.6k (2026 real AUD)

Reported / source value
$137.7k (2024 nominal)
Table total may differ if recalculated from $/MW × registered capacity after CPI adjustment.
Fixed OPEX / MW-yr
$26,371

Shown in table
$26.4k (2026 real AUD)

Reported / source value
$25.0k (2024 nominal)
Adjusted to 2026 real AUD using Australian CPI (All Groups).

How this was derived
Applied user-provided fallback default because no sourced plant-specific O&M was found.
Variable OPEX / MWh
$1.58

Shown in table
$1.58 (2026 real AUD)

Reported / source value
$1.50 (2024 nominal)
Adjusted to 2026 real AUD using Australian CPI (All Groups).

How this was derived
Applied user-provided fallback default because no sourced plant-specific variable O&M was found.
Fuel cost / GJ
—
Heat rate GJ/MWh
—

Confidence: low · Status: ai estimated · Capex basis: default · AI checked 08 Jun 2026

Notes
Could not verify a plant-specific greenfield capex for HVWWBA1 from SA Water, government, or AEMO sources in the available search results. The site is identified by AEMO as Happy Valley BESS (DUID HVWWBA1), but the retrieved sources did not disclose a project cost. O&M and performance fields therefore use the provided server-side battery defaults; fixed OPEX annualised as 25,000 × 5.52 MW = 138,000 AUD/yr, rounded to 137,700 in the source-free estimate.

Sources